Little Lulu (Princess Luna)

Author's Notes:

(WARNING!: Make no mistake this IS a padded pony fic! And as such as it will contain content that some readers will find disturbing! If you are uncomfortable with the idea of ponies in diapers, please click elsewhere and DO NOT, I repeat DO NOT READ!

For those who choose to stay, expect to see the following:
Diapers - Heavy
Ageplay - Heavy
AB/DL Themes - Heavy
Diaper Usage (Wetting) - Medium
Diaper Usage (Messing) - Medium
Implied Diaper Usage (Wetting and Messing) - Light to Medium
Breast Feeding - Medium)

Prince Ecosis announced back in 2018 that Princess Luna was going to be the next character in the original fanfic, and even approached me through PM with suggestions. But that was the last time he (or she) provided any updates on the fic. Using what information I was given, I've decided to continue it, starting with who was confirmed to be next.

The "Sex" tag was in the original, and since I'm including breastfeeding like in the original I decided to keep that tag just as a precaution. There's nothing explicit in this fic, the intention is not for it to be sexualized.

I'll lay down the ground rules for who can be voted on next time, seeing as there's going to be two chapters right out of the gate and I already have decided who will join Twilight next. In the meantime, I hope you'll enjoy Twily and Lulu's playdate. And be sure to check out the original fic if you want to better understand how this contiuation is supposed to work.

"Twily, wake up," Princess Celestia called to the sleeping padded alicorn in that motherly tone of voice. "I have a surprise for you."

Twilight was already surprised to be woken up by the sound of Princess Celestia's voice rather than feeling something brush against her, hearing something, or even smelling something. That had always been the case whenever the sun princess had surprised her in the past. What could the surprise be this time? Was it another unannounced playmate?

Her eyelids slowly fluttering open and Smarty Pants clutched firmly in her hooves (she could never get to sleep without her foalhood doll by her side when she was padded up), Twilight sat up in her bed. Soon, she found herself face to face with an alicorn that was actually smaller than her. The alicorn had a dark, grayish blue coat and a very light blue mane and tail that did not flow. Said alicorn had moderate cyan eyes, and a black patch on their flanks where their cutie mark was: A crescent moon.

Twilight let out a gasp as she gazed upon the alicorn (who was also wearing a diaper)! She remembered seeing this alicorn before, albeit only briefly in this smaller state. "Princess Luna?!" She commented in amazement!

The filly sized alicorn blushed, her diaper crinkling as she tried in vain to block it from view. It took her a moment to find the words she wanted to say. "Indeed... Twilight Sparkle, it is I. My sister has... volunteered me to be your next... 'playmate' as it were."

"Why are you so small?" Smarty Pants asked with a giggle. "Aren't you supposed to be... taller?"

Princess Luna's blush deepened and she seemed to shrink from Twilight's gaze. "Apparently, my sister," She looked to Princess Celestia with what seemed like a glare. "Decided it would be best if I were to be more on your level. As she put it, she felt that 'Twily' would appreciate being a 'big sister' for a change."

Princess Celestia seemed to be struggling not to snicker. "Oh come now, Lulu. You could use a break."

Luna snapped and shouted! "DON'T CALL ME LULU, TIA!" She only realized after the fact that she had used her "Royal Canterlot Voice" to make that statement, as was evidenced by the fact that Twilight was covering her ears (and had covered Smarty Pants' ears for good measure). Turning back to Twilight, she apologized. "Sorry, I didn't mean to be so... loud. I'm just not exactly thrilled with all of this."

"It's okay, I don't think any lesser of you for being in diapers," Twilight replied with a childish giggle. "Besides, I like you more this way. You're more... fun sized."

The night princess' blush returned with a vengeance. "Well, don't get any ideas, Twilight Sparkle. It is only for tonight. Tomorrow, I will be back to my normal alicorn size and I will be out of diapers," Then she vowed. "And for the record, I have no intention of using my diapers as a toilet. I am perfectly capable of using the bathroom."

"Aw, come on, Lulu," Smarty Pants encouraged. "What's wrong with using your diapers? Isn't that what they're for? With them, you can have a bathroom anywhere. And you don't even need to clean up afterward, you can get somepony else to do it for you."

Luna only shook her head from side to side. "Perhaps you and Twilight are okay with using your diapers for number one and number two, but I for one am not. I am still a princess, and a princess does not pee or poo herself. After all, I must set a good example for all my subjects, especially the little ones."

Celestia only replied with a smirk. "Oh, but Lulu, you're not a princess tonight. You are little Lulu, Twily's new playmate."

Just then, a thought struck Twilight and she inquired of Princess Celestia. "But if Luna is here, who's watching over the dream realm? Is it going to be you, Mommy?"

The sun princess smiled even as she shook her head. "I very well can't leave you two foals unattended, even within the castle. What kind of a mommy would I be if I did that?" And she explained. "I temporarily granted Cadence the power to enter the dream realm, and Luna left her a detailed list of what to do and what not to do. I'm sure my niece can manage by herself for one night."

"Oh, that's good," Twilight breathed a sigh of relief. "Now I know I'll have somepony watching over me even while I sleep, making sure I don't have nightmares."

Celestia nodded. "Indeed," Then she approached Twilight and pressed a hoof to her fellow alicorn's diaper. "Now, we'd better get you changed. You haven't even noticed that you've already soaked yourself in your sleep."

"Huh?" Twilight blinked as she felt her diaper compress and crinkle, admitting a familiar squishing sensation as it did. Now it was her turn to blush. "Lulu!" She exclaimed in a childish tone of voice as she eyed the shrunken night princess. "Why didn't you tell me I'd pee-peed myself?"

"You mean, you hadn't already noticed?" Luna blinked in surprise. "I thought for sure you knew. Your diaper was so wet, I could see the damp patches from a mile away."

Princess Celestia simply lifted Twilight up using her magic. "It's alright, Twily. That's why Mommy's here. I'll get you changed so you don't get a diaper rash. We wouldn't want your night with little Lulu to be spoiled," And to her sister she then instructed. "Now Lulu, you remain here. And remember, if you need anything, you just have to ask me."

Luna pouted and folded her hooves across her chest as she sat down on her diaper. "Whatever."

Twilight giggled as she was then carried across the bedroom to a secluded area, that way Princess Celestia could change her diaper in private.

By now, the art of diaper changing was very much second nature to Celestia. Quick as a flash, she had pulled Twilight's soggy old diaper out from underneath her, wiped her now bare bottomed student's flanks clean, strapped her up into a fresh diaper, and then sprinkled in a generous helping of foal powder. Then she lifted Twilight into the air while disposing of the old diaper in the trash, before setting the padded alicorn back down.

"Thank you, Mommy!" Twilight happily hugged the sun princess, delighting in the warm feeling and hearing her fellow alicorn's heartbeat. She didn't even appear concerned that she had supposedly wet herself without knowing or realizing it.

Princess Celestia couldn't help but find that odd. "Twilight's always been aware of whenever she goes potty in her diapers," She thought to herself. "Did she really not know she'd wet herself in her sleep? Or did she know and she was just pretending not to notice?" Quickly, she shook her head to dispel such thoughts. She was probably way overthinking it, it was probably just a sign of how well Twilight was adapting to her role. Foals didn't always know when they'd wet or messed themselves, and it seemed that Twilight had chosen to emulate such a mentality.

Twilight, for her part, just happily waddled away as her spotless diaper swished and crinkled with every step she took. She didn't have a care in the world, she was just happy to be clean and fresh again.

The two alicorns soon returned to where the small in stature Princess Luna was, still sitting in that pouting posture as she hadn't moved an inch. Next to her sat Smarty Pants, the old doll hadn't budged an inch from where Twilight had left it.

"Took you long enough." Luna frowned with impatience.

"Now Lulu," Celestia motherly scolded her shrunken sister. "You must have patience. Mommy had to make sure Twily was all nice and clean so she wouldn't get a rash."

"Besides," Twilight happily pointed out as she trotted over to Smarty Pants. "You could've talked to Smarty Pants, she's a great listener. You can tell her anything."

Princess Luna saw fit to ask. "You really have an attachment for that doll, don't you? My sister told me about that little 'incident' you had with it a few years back."

With a raging blush on her cheeks, Twilight picked up Smarty Pants and hugged the doll tightly. "I didn't mean for things to get so out of hoof, really. It was just supposed to be a harmless little spell."

"Yeah, except for when it made everypony in town fight over me!" Smarty Pants grumbled. "And then I had to spend months as a chew toy for Winona before you convinced Big Mac to let you have me again. You're lucky he knew how to fix me."

Twilight whimpered. "Smarty Pants, we've been over this. I already apologized."

Luna then apologized. "I'm sorry, Twilight. I didn't know your bond with the doll was so strong."

Twilight giggled as she corrected. "You're supposed to call me Twily, just like you have to call Mommy Mommy. That's how this works."

Smarty Pants chimed in. "Yeah! It's like being in a play. You gotta get into character and play your role."

The night princess frowned anew even as she reluctantly relented. "Fine then 'Twily', I suppose I'll let you decide what we do tonight."

"Wait, it's night time?!" Twilight gasped as she rushed to the nearest window to confirm her suspicion! Sure enough, when she gazed out of the window she could see the moon had already risen and the stars were lighting up the sky.

"Surprise!" Celestia declared. "Since my sister is usually asleep during the day and active during the night, I figured it would be nice to have a playdate at night for a change. You and Luna can spend the night together."

Twilight began bouncing up and down in excitement! "You mean, we can stay up past bedtime?!"

The sun princess gently nodded. "Just for tonight, my little ponies. And you can't stay up all night long. If I let you do that, you'd both be cranky in the morning. And nopony likes a cranky foal."

"I would be fine!" Luna insisted as she puffed out her chest. "Just give me a good cup of coffee and I'd manage."

Twilight gasped as her eyes seemed to go wide! "Lulu, Mommy says that coffee's bad for foals. It's like eating too much sugar. We're not allowed to have it."

"But I'm not..." Luna began, only to see the disapproving glare from her sister and relented. "Fine, I guess maybe I could be without coffee for one day," And then she turned to Twilight. "So, what should we do first tonight? The night is still young."

"Ooh! Ooh! I know!" Twilight happily exclaimed! "We could play board games together! And Mommy and Smarty Pants could play too!"

"What a great idea, Twily," Princess Celestia agreed as she used her magic to float over several different board games in brightly colored boxes. "Luckily, I made sure to plan ahead and get all the best boardgames I could find," She set them all down on the floor in front of the padded alicorns. "Go ahead, pick whichever one you like. Just be sure to leave the setting up to me. That's what grownups are for."

In no time at all, a board game was chosen from the collection and set up. It was a really simple board game, you placed your pieces on the board and your opponent did the same with their board. Then you took turns calling out spots on the board, with the goal being to find all of your opponent's pieces before they found all of yours.

Twilight happily sat on her padded flank, Smarty Pants close at hoof. Together, they discussed where the best hiding places for their pieces were, and where they should try to look in the hopes of finding Luna's pieces.

Luna, for her part, just impatiently set her pieces on the board with little to no thought given as to where they should go. "Are you ready to begin, Twily?" She called, trying her best to throw her voice to sound more... childish for lack of a better term.

Twilight was too absorbed with talking to Smarty Pants to pay any attention to Luna's comment. "You're right, Smarty Pants," She said with a grin. "That is a good hiding place. Lulu will never think of looking there."

"Well, I can't help it if I'm good at the game," Smarty Pants boasted. "Whenever we played together, I'd never lose a game unless I lost on purpose. But you're smart too, Twily. I've seen the clever hiding places you used when you used to play this game with your family."

Luna called again, "Twily, are you ready to begin? I don't have all night to wait, you know."

"Just a moment, Lulu," Twilight replied to her fellow alicorn, and after a moment of hesitation and deliberation, she set her final piece down on the board. "Okay, ready!"

The shrunken down night princess sighed in relief. "So am I!" And she insisted. "I'll go first," Clearing her throat, she scanned the top of her board and made the suggestion. "Uh... Cloud Nine."

With a cheeky grin on her face, Twilight said in response. "Nope, you missed. Now it's my turn." But it seemed like it took her a very long time to decide what to do. In a sense, she seemed almost... distracted for lack of a better term: Distracted talking to Smarty Pants, distracted looking at her own pieces, even distracted poking at her diaper with a hoof.

It was only when Smarty Pants called out "Uh, Twily?" that the padded alicorn seemed to realize she was holding up the game.

"Oh, sorry," Twilight sincerely apologized and cleared her throat. "Sky Seven."

Luna looked at her board, and after doing so a small frown formed on her face as she declared. "You zapped my weatherpony. You get to go again."

"Okay," Twilight happily replied and without hesitation she asked. "How about Air Ten?"

"You found my seagull. Go again." Luna replied even as her frown deepened.

Happily clapping her hooves, Twilight proclaimed! "Oh, this is easy! Smarty Pants was right!" And she issued another call: In short order she found all of Princess Luna's remaining pieces. The night princess had been defeated after only taking a single turn, and she hadn't been able to find any of Twilight's pieces.

Luna's luck didn't improve for any of the other board games she and Twilight played: They played one where you had to be the first to get your piece to the end of a board with colored tiles, one where you moved your pieces around the outside of a board to try to make it to "home", and even one where you had to solve a mystery by using clues given to you (and keeping track of clues shown to you by others). No matter what the game was, however, the night princess couldn't win. At best, she might get close, be a few turns away from winning. But a victory eluded her in all the games.

So it was that Princess Luna eventually proposed. "Can we do something else, Twily?"

"Like what?" Twilight asked after the fifth boardgame of the night was finished.

The shrunken down alicorn then suggested. "Well, why not watch a movie? We could even camp out together, set up a tent."

Princess Celestia smiled. "I think that's a wonderful idea! Luckily, I know of the perfect movie for the two of you! It's not scary, so I don't have to worry about it giving you nightmares."

A short time later, Twilight and Luna had managed to hastily erect a small tent made out of pillows and blankets. Alongside Smarty Pants, they nuzzled together inside of the tent as their diapers crinkled in unison.

Princess Celestia got a projector and a screen to project the images onto it. For snacks, she set a huge bowl full of applesauce down on the floor in front of the two padded alicorns.

Soon, the projector had a film reel placed into it. And as the lights were dimmed, a picture began to be displayed on the screen, accompanied by sound.

As it turned out, the movie was an old Power Ponies film from way back when. In fact, it was so old that it was mostly in black and white. The characters spoke very little, for the most part the music and visuals told the story.

Still, a movie was a movie. And Twilight and Luna watched every scene as it unfolded, occasionally dipping their hooves into the applesauce and licking said applesauce off their hooves.

Yet, try as the padded alicorns might to stay engaged, the time was catching up with them as the movie went on. It was hard for them to stay awake as their eyelids began to droop. However, they were able to fight off the urge to sleep long enough for the movie to end. An announcer declared: "And so, once again the day is saved, thanks to: The Power Ponies!" There was a flash of color as the Power Ponies' logo was displayed on the screen, and then the screen faded to black as the credits began to roll.

Princess Celestia turned off the projector a moment later, removing the film reel and putting the screen away. "Well, this has been a very enjoyable sleepover," She declared in a motherly tone of voice, before clapping her hooves. "But now it's time for all good little ponies to go to bed."

"Aw, but Mommy," Twilight playfully pouted even as she let out a yawn. "We're not tired. Lulu and I wanna stay up even later."

"Yes, what Twily said." Luna found herself agreeing.

Celestia chuckled as she effortlessly picked up the two alicorns with her magic (and picked up Smarty Pants too for good measure). "So, you're not sleepy yet? Well, I think I know what will fix that." She carefully deposited the two onto the bed that Twilight had been using since coming to Canterlot. Then, she sat down next to them and lifted up her wings to expose her underbelly.

Immediately, Luna's eyes widened in disbelief! "Sister! You're not actually going to...!"

"Growing foals need their nutrition," The sun princess insisted as she watched Twilight slowly scoot over to her, the padded alicorn wrapping her mouth around a teet as she began to suckle. "Go ahead, don't be shy."

"No thanks!" Luna protested with a gag face. "You are not our mother! I do not need breast milk! If you wish to breastfeed Twilight, that's one thing. But you won't do it with me."

Princess Celestia frowned, but reluctantly decided it best not to press the issue. "Oh well, more for Twily, I guess," And then she looked down to her charge and whispered. "Don't drink too fast now, Twily."

Twilight simply concentrated on timing her suckles to the rhythm of Celestia's heartbeat as she closed her eyes. The rich, creamy taste felt so refreshing to her parched throat. She almost didn't want to stop at all, yet she eventually felt herself be nudged away by a hoof from her fellow alicorn.

Celestia proceeded to pat Twilight's back, and Twilight responded by letting out a hearty belch. Luna watched the whole thing in amazement, surprised at just how much Twilight seemed to be immersing herself in the role of being a foal. It was like she truly believed Princess Celestia was her mother. Was it all just an act?

Well, the night princess didn't have a chance to dwell on the thoughts for long as she felt herself growing sleepier by the second. Yet as she began to close her eyes, she could see her sister getting off the bed and preparing to exit the room. The last thing she heard was. "Sleep tight, my little ponies." And then Luna drifted off to sleep.

Sometime later, amidst the darkness of the night, Princess Luna stirred awake. Something was not right, and she knew it. It took her a moment or so to place the source of her distress: It was a faint but familiar urge in her bladder. Come to think of it, it had been quite a while since the alicorn remembered having gone to the bathroom. She hadn't already focused on not going in her diaper, but it seemed her body had more or less cooperated up to this point. Yet if she didn't do something soon, she was certain that would change.

That meant there was only one thing to do. The princess of the night rose from bed and planted her hooves firmly on the floor. As her eyes adjusted to the darkness, she focused her attention on a door at the other end of the room. She knew from experience that it led to the bathroom. And what luck, the door was open ajar.

As Luna proceeded to use her magic to take off her diaper and set it carefully on the floor, she was startled ever so faintly when she heard Twilight stumble awake. "Lulu? What are you doing?"

"I'm just going to the bathroom, Twily," Luna whispered in reply. "Go back to sleep."

"But Lulu," Twilight protested in a whisper. "You can just go potty in your diaper. Mommy will change you."

The moon princess would not be persuaded for a second. "No, Twilight," She said quite firmly, using the proper name to signal her defiance. "It is as I told you before: I can use the bathroom just fine. I do not require any assistance. Just because my sister has regressed me in size does not mean I must act the way she wants me to act." And she began to trot off, quite unconcerned.

Twilight got out of bed and followed the shrunken alicorn, pleading with her. "Lulu, please! Just put your diaper back on and go potty in it like all good foals do! You don't wanna get into trouble, do you?"

"I will not get into any trouble, Twilight," Princess Luna sought to reassure her fellow alicorn. "Don't try to stop me. I'm going to use the bathroom like a proper princess. Princesses do not piddle their pampers." Slowly but surely, she was advancing along the floor and towards the bathroom door. She was quite determined to go through with her little rebellion.

Nervously, Twilight continued to follow Luna all the while she whimpered with fright. "Lulu, you can't go in there!"

Without looking back to Twilight, the shrunken alicorn asked. "And whyever not, Twilight? You may be fine using your diapers for a bathroom, but I am not. Now please leave me alone!"

"But... but..." Twilight stammered, trying to think of a good counter argument. She finally seemed to settle on. "What about the potty monster? You know it eats foals! It might eat you!"

Luna rolled her eyes, unamused by the childish behavior from Twilight. "Twilight Sparkle!" She sternly scolded and snorted. "There is no such thing as a potty monster! You know that! You're not two! The potty is nothing to be scared of. I will use it, and you will see that it is perfectly sized for a pony my size, let alone a full grown pony like yourself." And with that, she strolled into the bathroom, brimming with confidence in her desire to use the almighty porcelain throne.

Once inside the bathroom, Princess Luna used her magic to flick on the lights, quickly spotting the toilet as it rested not far from the bathroom sink and its accompanying mirror. She paused briefly when she eyed it, seeing that it was now actually a bit larger to her due to her shrunken stature. Getting onto the seat would be a bit of a challenge. But that wasn't going to stop her. She hadn't come all this way just to turn back now.

Twilight entered the bathroom just in time to hear a loud slam as she saw the lid of the toilet be thrown back against the top of the tank! "Lulu, be careful!" She cried as she watched the princess of the night make her approach to the fearsome porcelain beast! "Oh, I wish Mommy was here!" She whimpered.

The moon princess, for her part, just took a deep breath. It was kind of hard to concentrate now that the urge in her bladder had started to grow! The close proximity of her body to the toilet was clearly adversely impacting her ability to "hold it in" as it were. It took all the will power she had not to start peeing on the tiled floor. She proceeded to back up, before running towards the toilet as fast as she could! When she got close to the lip of the bowl, she jumped and extended her hooves outward to try to grasp the seat!

By some miracle, the shrunken in stature alicorn managed to grasp the edge of the toilet seat and hoist herself onto it. Then she wiggled about, trying to get into the proper position. It was a task made difficult by the slippery feeling of the seat, and its cold sensation on her hooves! As a result, she ended up slipping. As she did so, one of her hooves happened to reach the silver handle off to one side.

There was a click as the handle was forced down. And then suddenly, there came a great roar! The noise was awful!

Luna looked down and gasped, seeing the waters within the toilet bowl swirl and surge ominously! The flush cycle had started! And there was worse to come for her, as her body lost its balance. The princess fell off the seat, falling into the toilet with a loud splash! Soon, she was swept up by the spinning whirlpool, thrown one way and then another as she struggled to keep her head above the water!

"What's going on in here?!" The stern voice of Princess Celestia demanded, as the sun princess came trotting into the bathroom at that very moment. From the look on her face, it was clear she was anything but pleased.

"SISTER, HELP! I CAN'T SWIM!" The frightened voice of Princess Luna shouted at the top of her lungs in her "Royal Canterlot Voice"!

"Mommy, help! The potty monster's trying to eat Lulu!" Twilight whimpered and shuddered with fright, too terrified to move!

Immediately, Princess Celestia dashed to the toilet and used her magic to pull Luna free from the bowl! Just in time too, as the waters retreated down the drain and the flush cycle ended. Then, carefully, the sun princess set her soggy sister down on the tiled floor.

"Oh, thank goodness you're okay!" Twilight happily exclaimed! "I thought for sure you were a goner, Lulu."

Luna protested. "I was never in danger, Twilight. I couldn't have gone down the drain."

"No, but you most certainly could've drowned!" Celestia sternly scolded her shrunken sister. "What in the wide world of Equestria were you thinking, Luna?! Why did you take off your diaper and try to go potty like a big pony?! Why didn't you just come to me for help?! Now look at you, you're soaking wet and covered in toilet water. I'm going to have to give you a bath."

The night princess looked at the ground in shame. "My apologies, sister," She replied in a mournful tone of voice. "I thought I could manage all by myself. Clearly, I didn't take into account the fact that I am much smaller now. And therefore, using the bathroom would be a bit of a challenge," Then she noticed something, her urge to pee had disappeared. Looking down at herself, she almost gasped when she saw a small puddle appear underneath her. "Oh dear. Sister, I am so sorry! I haven't done that in ages!"

"All of this could've been avoided, Luna," Princess Celestia pointed out as she used her magic to summon up some sponges and a bucket of water. "Your diaper was a perfectly acceptable alternative to the bathroom, and I wouldn't have been bothered having to change you. It's not like I didn't already do that when you were younger, or when you were getting used to toilets after coming back from the moon."

Princess Luna unhappily sighed. "I guess some of my old immaturity came back to me alongside this physical regression. I am usually not this... rebellious. I just didn't feel like I needed to act like a complete foal."

The sun princess sighed back. "I suppose it's partially my fault too, Luna, for springing this onto you without asking you how you felt about it. Even so, if you were unhappy, you could've just told me."

"But would you have listened?! You got so swept up in your role." Luna protested.

"Guilty as charged," Celestia admitted. "Though, was being a foal again really all bad? Wasn't it nice to have some time off from your responsibilities?"

The shrunken down moon princess found herself reluctantly agreeing as she watched her "accident" be cleaned up. "I guess maybe that wasn't so bad. But I'm not sure if I was really the best choice for Twilight when she is like this."

Twilight then hesitantly spoke up. "Um, Mommy?" She looked at Princess Celestia with a blush.

Princess Celestia was about to ask what the problem was, when a familiar odd reached her nostrils. "Twily!" She exclaimed! Her tone of voice making it hard to tell whether she was truly surprised or just pretending to!

Twilight whimpered and stepped back. "S-sorry. I just got really scared when Lulu fell into the potty, and... well..."

Celestia quickly recovered, cooing at the padded alicorn. "It's okay, Twily. It's nothing to be ashamed of. This isn't the first time you've had a messy diaper in my presence, and it won't be the last," Then she declared. "I guess I'll be giving you a bath as well. Once I take care of your dirty diaper, anyway."

A short time later, Twilight was changed out of her dirty diaper. And then, soon afterward, she and Princess Luna were deposited into a bathtub filled with warm water and bubbles.

Princess Celestia worked quickly but gently to get her charges scrubbed clean from top to bottom, and smelling nice again. Then, after taking them out of the tub and drying them off, she put new diapers on both of them while pulling the plug out of the bathtub to drain everything away.

Twilight and Princess Luna were then returned to bed, and this time Princess Celestia adopted to lay down next to them so as to ensure they wouldn't be able to wake up and get into trouble without also alerting her to whatever it was they were doing. But this time, there were no disturbances. The three alicorns slept soundly through the night.

When Princess Luna woke up the next morning, she was quite relieved to be back to her normal sized body with a dark blue coat, and a flowing mane and tail consisting of sapphire blue and persian blue locks. She blushed as she noticed the diaper still wrapped around her flanks, which apparently hadn't fallen off even though it was now clearly much too small for her. Well, that was quickly rectified when she used her magic: Not to remove the diaper but to more or less inflate it so that it was sized up to her current body height.

It was a good thing the princess of the night did so, for at that very moment she felt her bladder give off the telltale signs of needing to empty itself. Rather than try to trek to the toilet to take care of the matter, the now fully sized alicorn decided to use her portable toilet instead. She relaxed as a faint hissing sound could be heard, and her padding swelled up as it absorbed her "accident" (for lack of a better term). What had she been so fussy about the night before? Peeing in a diaper wasn't that bad, really. It might even be useful for helping her in her nightly duties, she wouldn't have to leave the dream realm to go to the bathroom.

"Now where could I find diapers in my size without anypony getting suspicious?" Luna thought silently to herself. Perhaps her sister would know? Surely, Twilight's diapers had to come from somewhere.

It was on the subject of Twilight that Luna's thoughts began to change. What she had witnessed last night was still fresh in her memory, and gave her cause for concern.

"Good morning, sister," Princess Celestia cheerfully greeted at that very moment as she got up from the bed, taking great care while doing so to avoid waking up the still sleeping Twilight. Soon, the sun princess' wandering eyes noticed the now comically large and sodden diaper on Luna's flanks. She couldn't stop herself from snickering ever so softly. "Did you open your floodgates again last night, little Lulu?"

"Perhaps I did," Luna vaguely replied. "But I am not little Lulu anymore. I am Luna once again," Though, with a blush she added. "If you want to call me Lulu while you change my diaper, I won't mind it."

"You sure you don't want to do it yourself?" Celestia appeared to sincerely question.

The princess of the night shook her head from side to side and lazily replied. "Nah. It's much easier to make you do it."

The sun princess smiled and giggled. "Now where was this kind of cooperation last night, sister?" Then she used her magic to lift her "little" sister up and carry her away. It was a lot harder to do it now that Luna was back to her full grown self, but somehow Celestia managed.

As Princess Luna was having her flanks wiped clean a short time later, she whispered to Celestia. "Sister, we need to talk."

"About what?" Celestia inquired. With her tone of voice it was hard to tell whether or not she was truly unaware of the conversation that needed to happen, or if she was just feigning ignorance.

Luna took a deep breath, knowing that this conversation was not going to be easy. "It's about Twily... I mean Twilight," She quickly corrected herself. "About what you're doing for her."

Princess Celestia's smile disappeared. "Are you saying I'm wrong to treat her as my child? To baby her and treat her as a foal when she chooses to act as such?"

"Are you sure it's just an act?" Princess Luna questioned with concern. "I fear she may be getting too deeply into the role. She may actually be starting to mentally regress, whether she realizes it or not."

"Oh come now, Luna," The sun princess replied by waving a hoof. "Twily... er Twilight knows that she can stop at any time if she wants to. Besides, I'm probably never going to be a mother any other way. This way, we both get what we want: I get a foal of my own, and Twilight gets a mommy to take care of her. And it lets us both escape our worries."

The moon princess just replied. "Well, it may not be a bad idea to perhaps ease off on the role, just for a while. I fear you may be unintentionally creating a dependency on you that will be difficult for Twilight to break. If it is not stopped, it could have profound negative impacts on her mental state."

Princess Celestia noticeably hesitated when those words reached her ears. She was silent for a moment or so, before she sighed deeply and told her sister. "I'll... I'll think about it, I guess."

B.B.B.F.F. (Shining Armor)

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Author's Notes:

Shining Armor's got no shortage of fics involving him in diapers or him regressing, so I figured it'd be nice to give him a bit of a break and let him be the more mature one for a change.

Allow me to explain how the voting for characters will work: I'm going to aide by a couple of restrictions.
1. The Cake Twins, Flurry Heart, the CMC and other school aged characters are off-limits as playmates. This is both because I don't want to get into any trouble using underaged characters with a fic that has the "Sex" tag (even if no actual sexual acts occur), and because I can't think of how I would make them work without needing to regress Twilight physically (and possibly mentally).
2. Prince Ecosis said in the original fic's comments that he would reject any votes for Starlight Glimmer or Discord, and I'm going to more or less respect such wishes. No Starlight in this fic also means no Sunburst or Trixie since it wouldn't feel right to have them but not Starlight.
3. Any characters introduced after the beginning of Season 6 cannot be included here, but anyone introduced before then is fair game barring any prior restrictions.
4. The rest of the mane six and Spike were already covered in the original fic, but they can be included as part of a group. Same goes for Cadence.
5. Each commentor is allowed only one vote, if you wish to change your vote you must specify that your previous vote is cancelled.

On the subject of voting, I'll allow voting for about a month and will likely publish the next chapter at the start of October unless I specify otherwise. Happy voting.

When Twilight finally woke up after having slept in for Celestia knows how long, she was initially quite dismayed to find that there was nopony or any other creature waiting for her. No new playmate. There wasn't even a sign of her mommy anywhere. She was all alone, with only Smarty Pants for company.

Well, no matter, there wasn't anything that needed a mommy's immediate attention. As worried as Twilight might be by Princess Celestia's absence, she knew it was no cause for concern. Not yet, anyways. But the day still looked young, the sun wasn't anywhere close to being high in the sky. It was probably still morning, though it may not be that way for much longer given the sun's position.

"Looks like we have a little time to ourselves this morning, Smarty Pants." Twilight said to her doll as she slowly wiped the sleep out of her eyes, sat up fully in her bed and then got down while clutching her cherished object from foalhood tightly in her hooves.

Smarty Pants just replied. "Really? We're all alone? No Mommy? No playmates?"

Twilight nodded. "It sure looks that way, Smarty Pants. But I'm sure Mommy will be back before long. And until she does, we can play together and do whatever we want."

Yet just then, the door to the room swung open. And in trotted not only Princess Celestia, but also a very recognizable stallion to Twilight. Though the undergarment wrapped around his hindquarters did strike her as odd. It didn't look like a diaper, there were no visible tapes or landing zone. Still, those were matters for another time as the stallion cleared his throat and introduced himself. "Hey, Twily. Guess who got the day off to spend with you?!"

Twilight's eyes widened to the size of dinner plates, and she let out a happy shriek of joy as she embraced the stallion with a snow white coat! "B.B.B.F.F.!"

Princess Celestia flashed a warm and approving smile. "Yes, Twily. I figured you would appreciate the chance to see your big brother again."

Shining Armor couldn't help but snicker when he saw Twilight's diaper. "Still in diapers, huh, Twily? I thought for sure you'd have grown out of them by now," Then he added. "I can't believe you still have Smarty Pants. I thought for sure you'd have given her up by now. What, do you still sleep with her?"

Twilight couldn't help but blush. "What's wrong with that? Don't you still sleep with Brutus Force sometimes?"

"Who told you that?!" Shining exclaimed, before realizing what he was confessing to and he hastily corrected. "I mean... I have no idea what you're talking about."

"Oh, then what's this?" Princess Celestia asked as she levitated over a worn looking stuffed turtle. "I seem to recall you being very insistent that I let you bring this with you today, young colt."

At that Shining let out a happy whiney! "Brutus Force!" He forgot all about trying to save face! Using his magic, he pulled the stuffed turtle close and nuzzled it. "Oh, I've missed you so much, buddy!"

Smarty Pants couldn't help but laugh. "Guess Twily's not the only one in her family who has a snuggle buddy."

Twilight then questioned. "Are you sure it's okay to be here with me, B.B.B.F.F.? What about Cadence, and Flurry Heart?"

Shining waved a hoof. "Oh, don't worry about them. Cadence can take care of Flurry no problem. Don't forget, she's an experienced foalsitter. Plus, she's got Sunburst and an entire castle of guards and staff to help her out. She was quite insistent that she could manage alone," With a smile and a wink, he added. "She told me about your little secret. So, I decided to volunteer to be one of your playmates. You and Cadence had so much fun together. And I know we'll have even more fun together today."

Princess Celestia nodded. "I'm sure you both will. After all, I didn't just ask Shining Armor here for a playdate, Twily. I also wanted to request his help in keeping an eye on you today. I really can't think of anypony else who I know will keep you out of trouble."

At that the young alicorn gasped in realization! "Wait, you mean you're not going to be with me today, Mommy?"

The sun princess shook her head from side to side. "I'm afraid not, Twily. I'm going to be busy tending to a very important diplomatic matter. And if I took you with me to court, ponies might get the wrong idea."

"No!" Twilight protested with a whimper. "I'll be good, Mommy! I promise!" And she practically threw herself at the taller, older alicorn, desperately pleading. "Can't I go with you? Please?"

Celestia tried her best to keep a strong will and not let her composure break. She knew this was going to be difficult. But for Twilight's sake, she could not give in to the demand. "I'm sorry, Twily. But you have to know that I won't always be around for you. Sometimes, Mommy is busy or needs a break. That's why I'm officially tasking Shining Armor with watching over you. I know you'll be good for him."

Shining nodded in approval. "Yeah. And look at it this way, Twily. That means we'll have nothing and nopony to get in the way of our special playtime. It'll be just like old times, back when we used to play pretend together all around our house."

"Yeah, back before you started making goo-goo eyes at Cadence," Twilight playfully teased. Then she decided to ask something that had been nagging at her since she had seen Shining Armor come in. "But what is that thing you're wearing? It doesn't look like one of my diapers."

Shining flashed a toothy grin. "That's because it's not a diaper, Twily. It's a pull-up. And you know what that means."

"What? What does it mean?" Smarty Pants questioned. "What's the difference between a diaper and a pull-up?"

The pull-up wearing stallion proudly boasted as he puffed out his chest. "Oh, there's a lot of differences. But the biggest difference is that wearing pull-ups means you're in potty training. That means you do your pee-pees and poo-poos in the toilet, rather than in your diapers."

Smarty Pants seemed to be amazed if her tone of voice was any indication! "Wow! You can do that all by yourself?!"

"Yup," Shining Armor proudly proclaimed. "That's what big ponies do. And I'm a big pony. Unlike you, Twily."

Twilight frowned and stepped back. "Well, it's not like I don't ever want to use the potty. I just... like my diapers more, that's all."

"Hey, it's okay, Twily," Shining insisted as he stepped forward and put a hoof around her. "We can work on getting you to use the potty today, if you're feeling up to it. But if you don't want to, you don't have to. I don't mind changing your diapers. I've got plenty of experience from changing Flurry. And let me tell you, she can be quite the stinker."

"Well... you're no flower either!" Twilight playfully protested.

And Shining replied. "Never said I was."

Celestia smiled as she observed this playful bout of sibling squabble. It seemed like Twilight was slowly but surely accepting the idea of Shining Armor being her designated caretaker for the day, rather than the princess. "You two just have fun together, diapers or no diapers. Hopefully, this matter won't take all day," With that, she turned to depart the room. Though not before she waved and said. "Goodbye, Twily. Be a good little pony for your brother."

"Goodbye, Mommy!" Twilight waved in reply. And kept on waving until the sun princess had left the room, closing the door behind her. Just like that, Twilight and Shining Armor were alone together with only their stuffed animal companions for company.

It was Smarty Pants who tried to break the spell of silence that hung over the room after Princess Celestia's departure. Gazing in the general direction of Brutus Force, she waved to her fellow stuffed animal. "Hello, Brutus Force," She greeted in her most polite tone of voice possible. "I'm Smarty Pants, and I'm Twily's best friend."

Brutus Force didn't reply at all.

"Hey! Smarty Pants is trying to talk to you!" Twilight shouted at the stuffed turtle. "It's rude not to say anything back."

Shining Armor was quick to apologize as he picked up Brutus Force. "Sorry, Brutus Force isn't much of a talker. He's the strong, silent type. That's what makes him such a good listener."

Twilight blushed. "Oh, well that's okay. I guess not every companion can be like Smarty Pants or Boneless."

Shining nodded. "Yeah, some are more talkative than others. But Brutus Force is Brutus Force, and I wouldn't have him any other way," He smiled as he nuzzled the plushie some more. "Gosh! Brutus Force and I, we go way back! Oh, it feels so good to be able to play with him again!"

Twilight grinned. "I felt the same way when I finally got Smarty Pants back from Big Mac. I was so happy when he finally agreed to let me have her again."

"Yeah! And it meant I could finally stop being Winona's favorite chew toy," Smarty Pants commented. "Those were the worst months of my life. It's a good thing I'm so strong."

The young alicorn nodded ever so slowly. "Yeah. And now that I have you again, Smarty Pants, I've never letting you go! You and I, we'll be together forever and ever!"

Shining Armor smiled as he observed the heartwarming display of affection his little sister was showing. "I'm glad you still love Smarty Pants so much, Twily. You used to take her with you everywhere you went. And I still remember the day I gave her to you as a present," He wiped a tear from his eyes. "Oh, I feel so old just thinking about it! Look at me, getting all sentimental over some doll."

Twilight giggled, nuzzling up against her brother's chest. "Nonsense, B.B.B.F.F., that's what makes you you. And I wouldn't have you any other way."

"Aw, Twily! You always know just what to say to cheer me up, don't you?" The stallion happily replied as he embraced his sister in a hug. Then, when the hug ended, he trotted over to inspect his sister's diaper.

"Uh, what are you doing, B.B.B.F.F.?" Twilight questioned as she felt her diaper be pulled back with a hoof.

Shining was quick to explain. "Well, foals don't always know when they've gone number one or number two. I have to make sure you don't get a rash. How would I ever explain that to your mommy? She'd have my head for sure," He finished the diaper check just seconds later as he declared. "Well, you're dry and clean for now. Figured you were, but it never hurts to check," Then he turned his attention to his pull-up. "As for me, I think it's about time for me to use the bathroom."

"Oh, you have to go potty?" Twilight asked in a playful tone of voice.

Giggling at the childish term, the pull-up wearing stallion nevertheless nodded. "Yes, I certainly do, Twily," Then he got an idea. "As a matter of fact, maybe we should try to see about getting you on the potty as well."

"Are you sure?" Twilight hesitantly questioned as she looked at her diaper. "I kind of like my diapers."

Shining Armor sighed as he trotted over to his sister. "Aw come on, Twily. I promise I won't let anything bad happen to you. Besides, that one mishap with the potty, it was years and years ago."

But the padded alicorn protested. "But you remember, don't you?" And her mind began flashing back to a memory that she'd previously thought she had banished to the farthest corners of her mind.

A much younger (and much smaller for that matter) Twilight was waddling along through the house she lived in with her parents and her big brother Shining. For a foal her age, she was very curious and very eager to learn about everything she could. In fact, she was far ahead of her peers when it came to reading. That's how smart she was.

Suddenly, the foal happened to notice Shining Armor coming out of a room. A very peculiar room at that, because it seemed to have some strange objects in it that commanded her attention. Naturally, being curious, she decided the best course of action was to trot up to the nearest pony and start asking questions. So she waddled her way up to her big brother. "B.B.B.F.F.?" She asked him while giving him the biggest set of pleading eyes.

Shining (who was actually somewhat scrawny for a colt his age, it wouldn't be for at least another year before he would hit a growth spurt) looked down, his eyes immediately noticing his little sister. "Hey, Twily," He cheerfully greeted. "What's up?"

"What's that room you were just in?" Twilight inquired of her older brother. "It seems like you go into that room a lot. And so do Mommy and Daddy. But it's not a room I remember going into at all."

The colt looked back. "Oh, that? That's the bathroom. You've definitely been in there sometimes. That's where you have to take baths, after all."

The little filly adopted a puzzled look. "But, you weren't taking a bath, were you?"

Shining Armor shook his head from side to side. "Nope. I was just using the toilet, because I had to pee."

"What's a to... to..." Twilight struggled to get the word out that her brother had just used.

"A toilet? Well, it's what grown-up ponies use instead of diapers," The colt tried to explain. "Someday, you'll use it too."

Her curiosity piqued, Twilight asked her brother. "Can I see it?" The only thing better than learning a word was learning what that word was or what it looked like.

Shining was uncertain for a moment. But one look at his sister's face melted any will he might have had to say no. Scooping her up with his hooves, he said to her. "I don't see why not. Come on," He carried his little sister into the bathroom, and set her on the floor in front of a tall, white colored object that appeared to be made out of some kind of stone. "See that?" He gestured to the object. "That's a toilet."

The little filly examined the object carefully. It appeared to be a mix of a chair, a box and a bowl. Above the bowl was some sort of lid, and off to one side there was a silver colored thing. Connected to the back and the bottom of the object were what appeared to be pipes that were built into the nearby wall. After inspecting it, however, she was still puzzled. "I don't get it."

The little colt did his best not to laugh. As smart as his sister was, she was only two. There were bound to be things she wouldn't understand just yet. "You will someday, Twily. After all, Mom and Dad say you're just about ready to start potty training," Then he got an idea! "Wait, I know! We could start your training right now! You could try to use the toilet! You're so smart, I bet you could get it right on your first try!"

With the idea planted in her head, Twilight eagerly agreed! "Yeah! Let's try it!" But then she blushed as she realized she didn't have a clue as to how "potty training" was supposed to work. "Uh, how do I do it?"

Shining Armor smiled and happily explained. "It's really simple: You just take off your diaper," He used his magic to remove his sister's diaper and carefully set it aside. "Then, you sit down on the seat," He proceeded to lift up the lid, exposing some kind of curved horseshoe opening above the bowl with water flowing underneath it. Once he'd done so, he placed Twilight carefully on the seat with her rump hovering over the bowl and her legs dangling off to either side. "And then, you just do what you do in your diapers."

"Is that all?" Twilight asked as she sat on the seat.

"Well, then you have to wipe and flush, and then you wash your hooves," Shining told his sister. "To wipe, you just use some toilet paper," He proceeded to float over a white, papery substance divided into squares. "And to flush, you just press the handle down," He deposited the toilet paper into the bowl and directed his sister's attention to the silver object from before. "Just like this."

There was a click, and then what sounded like a roar (at least to Twilight's unprepared ears). Twilight looked down, seeing the waters in the toilet bowl swirling around in a dizzying motion. Then, suddenly, they swirled down a hole at the bottom of the toilet bowl and disappeared. But then the waters slowly returned as if nothing had happened. And the whole thing had unfolded in just a few seconds.

Needles to say, the little filly was extremely fascinated, eager to learn more about this strange contraption.

"So, what do you think, Twily?" Shining Armor questioned. "Wanna give it a try?"

Twilight nodded. "Uh-huh," And she boasted. "I wanna try it all by myself!"

The colt blinked in surprise. "You sure you don't want my help, Twily? It's okay, I don't mind it. I still sometimes need help from Mom and Dad when I use the toilet."

But the unicorn filly was quite insistent. "I don't need help!" And the look she shot made it quite clear she wasn't going to change her mind.

Reluctantly, Shining decided to respect his little sister's wishes. "Okay. But I'll be waiting just outside the bathroom if you change your mind. And don't feel bad if you don't do anything. What matters most is that you try." Then he trotted out of the bathroom, shutting the door so as to give Twilight some privacy just in case she did do something.

Unknown to Shining, he had just given his little sister the chance to do something that most ponies never would've even thought of. There was still something nagging at the filly as she sat on the toilet. What was that hole for? It had to be there for a reason. It seemed quite silly for something to have a hole in it for no reason. And was it related to the motion of the water in the bowl?

Well, there was only one way to find out. Twilight turned towards the silver handle, recalling that her brother pressing it down was what had caused the toilet to "flush" last time. And the "flush" was what made the waters swirl around before disappearing down the hole (before returning, of course). The hole had to lead to somewhere. Ponies obviously wouldn't use something like this if it didn't get rid of their waste somehow.

So it was that the unicorn who was no more than two reached out across the seat to grab the handle. With all of her might, she forced it down to trigger the flush. Just like before, there was a loud noise and the waters in the bowl began to spin around and around. Soon, they would retreat down that hole.

Without hesitating for even a second, Twilight stood up on the seat and then jumped from it down into the bowl. She landed with a splash! As the flush cycle continued, the filly felt herself be swept up by the spinning, surging waters. It also felt like there was something tugging on her from below, trying to pull on her. She didn't try to fight it, this was the only way she could find out how the toilet worked.

The flush cycle began to end as the waters retreated down the bowl, taking Twilight along with them. Down, down, down she descended. All the while the hole at the bottom drew closer and closer! Suddenly, the powerful tugging sensation grabbed hold of the filly by the tail! The next thing she knew, she was swept down through the hole as everything went dark! All she managed to force out was a garbled cry.

Then and only then did the flush cycle end. The waters in the toilet bowl refilled. But Twilight had disappeared!

Shining Armor had heard the flush, but had thought nothing of it. Only when the flush cycle ended did he call out through the bathroom door. "Are you all done, Twily? Do you need any help wiping?" He waited, but there was no reply. Seconds past. "Twily?" He called again, and again received no reply. That struck him as odd.

The colt pushed open the bathroom door, expecting to see his little sister on the other side. But she was nowhere in sight. Her discarded diaper lay on the floor, and the lid of the toilet was still up. The seat remained as it had been before, but there was no indication as to Twilight's presence anywhere.

That's when it hit Shining! He'd thought he'd heard some kind of cry just before the flush cycle ended. "No! She didn't!" He thought to himself, but there seemed to be no better explanation as to his sister's mysterious disappearance. Either accidentally (or more likely intentionally), she had flushed herself down the toilet!

Shining Armor frantically rushed out of the bathroom as panic filled every ounce of his being! "I've got to save Twily!" He said to himself!

The flashback ended as the Sparkle siblings and their plushie pals entered the castle bathroom together. "Come on, Twily," Shining Armor insisted as he approached the toilet. "I won't let you go down the drain again. You're too big to fit down it, and so am I."

"I... I know that," Twilight protested in a hesitant tone of voice. "But still... using the potty instead of my diapers..."

Shining just pulled down his pull-up as he lifted up the lid of the toilet. "Just do what I do, Twily. You'll see. There's nothing to be scared of." He proceeded to plant his bare bottom upon the toilet seat.

Twilight watched with hesitation and concern. "Be careful, B.B.B.F.F.!" She seemed to whimper.

The stallion wasn't concerned or worried in the slightest as he relaxed. Soon, a hissing sound could be heard that seemed to echo across the entire bathroom. But it faded after a few seconds, at which point Shining Armor raised his hooves above his head and proudly proclaimed in a childish tone of voice. "I went potty!"

"Oh, you're so brave!" Smarty Pants exclaimed with exaggerated praise.

"He is, isn't he?" Brutus Force remarked.

Shining nodded. "Yup. Gotta be brave to be a royal guard and marry a princess. You think Cadence would want anything to do with me if I were still in diapers?"

Twilight giggled. "Oh, I don't know. I think she'd love marrying a big foal to take care of."

Shining Armor only snickered back. "Very funny, Twily," Then he rose from the toilet and gestured a hoof to the seat. "Now come on, it's your turn. Just waddle over here and give it a try."

"Come on, Twily! You can do it!" Smarty Pants encouraged. "Even I used the potty once, remember?"

The padded alicorn sighed, realizing that both her brother and her best friend had a point. This was something she had to do, or at least try to. Her brother was in charge, and he'd promised he wouldn't let anything bad happen to her. And whenever he'd made that promise in the past, he had kept it. So, carefully and slowly, she waddled her way towards the toilet. "I'm not really afraid of it, am I?" She thought to herself with concern. "It's just part of the act, pretending to be afraid, right?"

"That's it! Come on, Twily!" Shining Armor encouraged, sounding more like a father trying to get his child to take their first steps. "I know you can do it! Just a little bit closer!"

The young alicorn hesitantly took a few more steps forward. The toilet almost seemed to be taunting her, as if it were saying "Sit down on me. I dare you!"

"Just a bit closer, Twily! You're almost there!" Shining encouraged as he saw his sister waddle so close he could almost reach out and touch her if he wanted to. But he didn't, he just stood by the toilet and motioned for her to approach him.

Shutting her eyes, Twilight made one more big effort and took a few more steps forward! She was soon rewarded for her efforts as she felt herself be lifted into the air by her brother's hooves! In one swift motion he pulled down her diaper and deposited her onto the toilet seat!

Twilight, for her part, just concentrated as best she could. She eventually managed to force herself to pee, just a little bit.

"Well done, Twily!" Shining Armor cheered and clapped his hooves! "See how easy and fun that was?"

With a blush forming on her cheeks, Twilight playfully admitted. "Yeah, I guess it was. You were right all along, B.B.B.F.F.!"

"Of course I was, Twily!" Shining insisted, and then wiped another tear from his eyes. "Gosh, it really does bring back memories. You grew up so fast. Seems like only yesterday I was teaching you how to wipe your plot."

"Oh come on, you're not that old." Twilight teased as she got up from the toilet, wiped herself clean and flushed the toilet. Then, she and Shining Armor made their way over to the sink and washed their hooves together. Afterwards, Twilight had her diaper put back on, and the two exited the bathroom. They still had a lot of playtime together, after all.

Before leaving the bathroom, Twilight took one last look at the toilet. Something continued to nag at her regarding her "fear" of the porcelain throne. She kept telling herself it had just been part of the act, but something in the back of her mind couldn't help but think. "Was I actually afraid of it? Did I really believe it was a monster that could eat me? Have I really just been acting the part of a foal this whole time, or have I been somehow started becoming one?"

"Twily, you coming?" Shining Armor called. "Or do you have to do a poo-poo?"

The padded alicorn shook her head to clear the mental cobwebs. "I'm good, B.B.B.F.F. Just... thinking about something, that's all." And she pushed her worries to the back of her mind, they could wait until after playtime. She remembered that playtime with her brother always made her feel better, it could always be counted to take her troubles away.

Princess Celestia tried her hardest to keep her focus on the diplomatic matters at hoof during the long meeting. But she still couldn't help but find her thoughts drifting back to Twilight. This was even harder than the times she'd had to go to court, and had reluctantly left Twilight alone for a little while.

The sun princess did her best to tell herself that this was what was needed for the both of them. "Besides," She thought to herself. "You left Twily in perfectly capable hooves. Shining Armor certainly knows his way when it comes to foals."

Even so, when at last the meeting was concluded and the delegates had departed, Celestia felt as if she'd had an enormous burden lifted from her. With a smile and a spring in her step, she happily raced back to the private suite Twilight was staying in, ready to embrace her foal again, hold her close and do all sorts of motherly things!

When the alicorn with a majestic white coat reached the suite door and forced it open with her magic, she was hardly prepared for the sight that greeted her eyes!

Smarty Pants was sitting in a small pen of some sort, almost like a jail cell you might say. And Brutus Force was standing in front of Smarty Pants, clutching a ruler in one appendage.

"Help me, brave knights!" Smarty Pants cried out! "This dragon won't let me go! And he has really bad breath!"

"Rawrrr!" Brutus Force roared in an exaggerated tone of voice! "Me dragon! Me no like ponies and knights!"

Standing behind a hastily erected fort of pillows, Twilight and Shining Armor could be seen with paper hats on their heads and toy swords held firmly in the glow of their horns.

Suddenly, with a cry of "Charge!" the two ponies emerged from the safety of their pillow fort, their swords at the ready! They swung their swords hard into the "dragon" that was Brutus Force, knocking him down!

"Take that, dragon!" Shining Armor declared in an exaggerated, booming tone of voice. "You shall not kidnap fair maidens on our watch!" And then he pushed his sword towards Brutus Force's chest in order to "slay" the plushie.

Brutus Force fell to the ground, proclaiming in a very over the top way. "Oh, I am slayed! Curses!"

Twilight, meanwhile, raced to the pen and lifted Smarty Pants out. "Have no fear, Princess Smarty Pants. Your brave and loyal knights are here to rescue you."

"Oh thank you, brave knight!" Smarty Pants said as she was carried to safety by Twilight. "You are my hero!"

And when Twilight rejoined her brother, they stood over their defeated enemy and proclaimed. "The royal knights save the day once again!"

Princess Celestia had observed the whole thing, and couldn't help but applaud the performance. "Bravo! Bravo!"

That caused Shining to break character as he blushed. "Oh, how much of that did you see, princess?"

Celestia giggled. "It's quite alright, I won't tell anypony. It seems like you and Twily have had a fun day together."

"Uh-huh, Mommy!" Twilight beamed. "B.B.B.F.F. helped me use the potty today. I actually did a pee-pee in it! But I like my diapers better, the potty just isn't as fun."

"Oh, that's alright," The sun princess cooed in a motherly tone of voice. "You can stay in your diapers if you want to, Twily. Mommy doesn't mind changing you, no matter how stinky you get. All the same, I'm very proud of you for facing your fear of the potty head on and learning that it is nothing to be scared of."

Shining Armor smiled. "It was great practice for when Cadence and I will have to potty train Flurry Heart, not that I think we'll be doing that anytime soon."

"I hope she doesn't ever potty train!" Twilight teased. "I hope she stays in diapers forever! Diapers are so much fun!"

"Let's not give her any ideas, Twily." Shining protested

Princess Celestia just winked. "Oh, don't worry. I know you and Cadence will raise her right. And I'm sure her Auntie Twily will be happy with her no matter what she does."

"Oh yeah, Cadence told me about Flurry's 'first words'," Shining realized. "That was you, wasn't it?"

Celestia nodded. "I'd be more happy than to do something nice for you, Shining. You deserve a reward for helping out today."

The stallion shook his head from side to side. "Just getting to play with Twily again is reward enough, your majesty. It was a lot of fun, really," But then he put a hoof to his chin. "Although, I wouldn't necessarily mind doing it again someday, but only if Cadence got to be part of it too. I'd hate for her to miss out on the fun."

The sun princess smiled anew. "I'll keep that in mind." In the back of her mind, however, she couldn't help but think. "Twilight seems to have been okay without me. But is that just because her brother was acting more as her caretaker than her playmate?"

Octy and Vinyl (Octavia and Vinyl Scratch/DJ-PON-3)

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Author's Notes:

Tiber Septim II, when he (or she) voted for Octavia, specifically suggested the idea of Octavia and Twilight playing, listening to, and singing music. So when Octavia (and Vinyl Scratch) won the first round of voting for this fic, I decided to go with that idea for this chapter.

Octavia's punishment is a reference to another padded pony work, Indiscreet Shipping, as well as to its much more NSFW sequel The Best Week Ever. I highly recommend the former, it's one of the all time best padded pony works in my opinion. I also threw in some references to Deviant Art user bobthedalek, who's done lots of fan art involve Octavia and Vinyl, as well as his own O.C. parents for Octavia.

Now, since Twilight Velvet, Spitfire, and Moondancer were all voted on in the first round, I'm going to count each of them as having received half a vote here. That way, if other characters that have not been deemed ineligable are voted on that weren't voted on in the previous round show up, they'll be favored. But you can vote for those three characters mentioned above if you want. And as always, be sure to suggest any ideas for what you might like to see Twilight do with her next playmate/playmates. Like last time, voting lasts a month from when this chapter is uploaded.

Twilight had thoroughly enjoyed playtime with Shining Armor, it had really made her feel young again. Well, younger than she normally felt going through all of this with Princess Celestia. She was a little sad her big brother couldn't stay and play longer, but he had his grown-up responsibilities to tend to.

Fortunately, the padded alicorn wouldn't have to wait long for her next playmate to show up. The very next day, she was awoken from her slumber by the sound of a crash. It wasn't a particularly loud or violent crash, but it still startled her due to being so unexpected!

An unfamiliar, posh sounding voice suddenly spoke up. "Sorry, I didn't expect my cello to be so heavy. In my defense, I was not expecting to be called here so soon. I thought I wasn't scheduled to perform for at least another day."

And a far more laid back voice chimed in. "Really, Octy, you didn't have to bring it here. Foals shouldn't be handling such heavy things. You could've gotten a boo-boo."

Twilight spun around, suddenly finding herself face to face with a brownish-gray coated earth pony with a blackish-brown mane and tail, and a lilly white coated unicorn with a cobalt and electric blue mane and tail. Their cutie marks were music related, both depicting musical notes and symbols. And (much to the alicorn's relief) both of them were already wearing diapers. Pretty thick diapers from the looks of it.

A slight blush formed on the earth pony's face despite the fact that she was not the only pony in the room wearing diapers. "Oh... Princess Twilight!" She exclaimed as her eyes widened. "My apologies, I thought I was being called to the castle for a private performance for Princess Luna. Her birthday is coming up, after all."

"Guess it's a good thing I decided to tag along today, huh, Octy?" The unicorn said with a smile as she swished her padded rump around. "Something tells me that we're not here to give a performance."

"Indeed you are not," Princess Celestia declared as she came trotting up on the scene with a motherly smile. She looked to Twilight and happily told her in that motherly tone. "I hope you don't mind, Twily. I was thinking about who to invite for your next playdate, and I just happened to remember a certain..." She coughed into a hoof. "Incident in Ponyville not too long ago."

Twilight's wings went wide with shock! "Really?! What happened?!"

The unicorn chuckled. "All you need to know is that Octy here," She gestured to the earth pony. "Gave a certain no good jerkface what he deserved. Obviously, his mommy never taught him manners. I just wish I could've been there in pony to see Octy put that guy in his place."

Princess Celestia coughed into a hoof as she cleared throat. "Yes, well, after... that," She explained. "I still reluctantly had to punish Octavia Melody here," It was possible to see the earth pony mare blush anew. "She was to perform for my sister's birthday party, and as punishment she was to wear a diaper until after said party. Since she was already here in Canterlot, I thought it wouldn't hurt to invite her here to be your playmate for today."

"And don't forget me!" The unicorn eagerly chimed in with a toothy smile. "You probably know me as DJ-PON-3, but today I'm just Vinyl Scratch, or Vinyl for short. I'm Octy's roommate and best friend. If it weren't for me, Octy would've probably never gotten in diapers: Wearing 'em and using 'em."

Octavia looked down at her padding. "Well, I must admit they are cheaper and far less troubling than other methods of stress relief. And not having to worry about needing the washroom is helpful, I suppose."

Celestia then chimed in. "I'm glad to hear that, seeing as the bathroom will be off limits without adult supervision. I very well can't risk any mishaps or other accidents. But it's okay, I don't mind changing anypony. I'm more than used to it with Twily."

Twilight then happily threw her hooves around her fellow alicorn, hugging her tightly. "Oh thank you, Mommy! I get two playmates on the same day! I'm so lucky to have you!"

Princess Celestia just smiled, stroking Twilight with a hoof not unlike the way a mother would with their child. "I'm the lucky one, Twily. You are the cutest, most amazing foal I've ever known. I'm proud to be your mommy for as long as you need me."

"Ooh!" Twilight suddenly got an idea as her eyes lit up! "I have to tell Smarty Pants about this! Boy will she be surprised!" She promptly raced over to her bed, and retrieved the well worn stuffed donkey. "Hey Smarty Pants, guess what? Mommy's brought two new playmates here today. And they're both into music."

Octavia and Vinyl were more than a bit surprised at first to hear Smarty Pants actually talk (even if it was more or less just through Twilight throwing her voice). "Oh, that's cool. That means we can do all sorts of fun things with music: Listen to it, play it, even sing along to it. Did you know I used to sing to Twily all the time when she was on the potty? Without my singing, she couldn't even tinkle."

"Smarty Pants!" Twilight playfully whined. "Don't tell them that, they don't need to know. Besides, I don't really use the potty anymore. I like my diapers better."

Vinyl Scratch just chuckled. "Hey, it's okay. Octy sings in the shower all the time, so singing in the bathroom isn't a weird thing at all if you ask me," Then, poking her padding, she added. "And I agree with you, Twily, diapers are so much better than potties. Once I started wearing diapers at my gigs so I didn't have to worry about bathroom breaks, I never looked back. Trust me, the public bathrooms at some of the clubs I've gone to have been really bad."

"So, how long have you and Smarty Pants been like this, if I may ask?" Octavia questioned in uncertainty. "Obviously, I don't have as much experience in all of this stuff compared to you and Vinyl. I only attended my first playdate about a day or so before that... event in Ponyville that got me in trouble."

Twilight smiled as the padded alicorn proclaimed! "Oh, I've been doing this with Mommy for quite a long time now. I don't know exactly, I've lost count. But every day I've been doing it has been the best day ever! I can't wait to have another day of fun with you both: Octy and Vinyl."

Smarty Pants then saw fit to ask. "So, what was that noise Twily and I heard earlier? I know it startled us. I'm honestly surprised Twily didn't pee-pee herself in fright."

Octavia broke out into a raging blush as she gestured to a well worn case lying on the floor behind her. "That's my cello. I brought it here because I thought I was going to be performing for Princess Luna. Although now, I suppose I could get in a little bit of practice with you and Vinyl. My cello is a bit big, but I actually learned how to play it when I was an actual foal. My mum made me take lessons when I was just two years old. Potty training came along a little later."

"Meh, potty training's overrated," Vinyl shrugged. "But I'm glad I brought along some of my old tapes. They've got all the songs I loved to listen to as a foal. Figured they might help Octy find some inspiration, or just help her get into the mood."

"Can we listen to them?" The padded alicorn princess inquired in a hopeful tone of voice.

"Well, how about we have breakfast first, then you three can do whatever you want," Princess Celestia proposed to the three padded ponies in her presence. "I got so much work done at my day court yesterday that I don't actually have to go back if I don't want to."

Octavia seemed to nod in approval. "Breakfast does sound good. I didn't exactly have a chance to get something to eat this morning since I was in such a rush."

"I'll say!" Vinyl chuckled and snickered as the off-duty DJ pointed out. "You were in such a rush you didn't even notice when you'd piddled your pampers. Good thing you had me to change you. Wouldn't have wanted the entire castle staff to know about our little secret." She delivered the last line with a knowing wink.

"You were wet too, Vinyl." Octavia protested, but to no avail.

Princess Celestia led her charges to the castle's main dining room, which was thankfully void of other ponies at the current moment. "Get comfortable, my little ponies," She cheerfully told them. "There should still be some breakfast leftover from this morning. And if not, I'll happily make it for you myself."

Twilight sat at one end of the large table, giggling as her diaper crinkled and compressed as she wiggled about in her seat. Smarty Pants was seated right next to her. "Whoa! This chair is super soft!" She exclaimed to the stuffed donkey.

"Everything feels soft to me, Twily, remember?" Smarty Pants reminded the alicorn.

"I know. I wish you could feel things like this. This is probably softer than anything you're used to," Twilight commented with a dreamy sigh, occasionally using her hoof to poke at her padding. "How about you two?" She asked the two padded musicians.

Vinyl was leaning back in her chair at the other end of the table, allowing her rear to sink into the seat of her diaper. "I wish it was a high-chair, that would really make the experience feel authentic."

"Do they even make high-chairs for big foals such as us?" Octavia pondered as she sat next to Vinyl, still looking a bit uncertain. "Are we sure we should be doing this? That we're not intruding on what the princesses have going on between them?"

The padded unicorn reached out a hoof as she leaned over, reassuring her friend. "Hey, don't be nervous. Twily obviously doesn't mind, and neither does Princess Celestia. Just relax, Octy. Think of this as a much needed vacation. We can use this time to take a break from all those big pony responsibilities that keep us up at night."

The earth pony mare reluctantly agreed. "If you say so."

Just then, the dining room doors swung open. In trotted Princess Celestia, pulling a large cart behind her with her magic. She was also levitating over some bibs, tying one each around the necks of Twilight, Octavia, and Vinyl Scratch. "Wouldn't want anypony making a mess of themselves." Then she floated over three large bowls that had steam rising from them.

"Is that what I think it is?" Twilight asked as she eyed her bowl with excitement.

The sun princess happily nodded. "Yes indeed, it's oatmeal. And it has honey, cinnamon, and fresh strawberries. Just the thing for growing foals to get their nutrition," She proceeded to float over three red colored plastic spoons. "Now, can you feed yourselves, or do you want Mommy to feed you?"

Immediately, the padded alicorn threw up her hooves. "Feed me, Mommy! Please!" She adopted the best pair of pleading puppy dog eyes imaginable.

Celestia couldn't say no to such an adorable face. She trotted over to Twilight's position and sat down next to her, ready to begin the spoon feeding. As she did so, she could see Vinyl Scratch already tossing her spoon aside and using her hooves to eat the oatmeal. Octavia, after some noticeable hesitation, did the same.

Twilight, for her part, happily cooperated with her fellow alicorn on spoon-feeding. She opened up her mouth as wide as possible, allowing the sun princess to deposit spoonful after spoonful of yummy oatmeal onto Twilight's tongue. The honey, cinnamon, and fresh strawberries all created a delicious blending of flavor! Oatmeal had never tasted so good!

Sooner than either princess would've liked, however, the spoon-feeding came to an end as the bowl was depleted completely of its contents. Still, it had been fun while it lasted.

"Now, how about some milk to wash it all down?" Princess Celestia proposed to her fellow alicorn.

Twilight knew what her fellow alicorn meant, but it was a bit hesitant. "Are you sure we should do that in front of Octy and Vinyl?"

The sun princess looked across to the other two padded ponies, who seemed fully occupied licking the last bits of flakey oatmeal from their hooves. "I don't think they're paying any attention to us. We'll have to make this quick, though." And she exposed her teets.

Twilight, with practiced precision, latched onto one of Celestia's teats and began to suckle. It wasn't long before the taste rich, creamy milk was on her tongue. She closed her eyes, listening to the rhymtic sound of Celestia's heartbeat as she timed her suckling to it.

"Okay, Twily," Princess Celestia said after almost a whole minute had gone by. She gently weaned the padded alicorn off the teat as she said in that motherly tone of hers. "That's quite enough milk for you for now. We don't want to upset your tummy."

The padded alicorn, though disappointed that the breast feeding had been so brief, reluctantly agreed. "Okay, Mommy. But your milk was really, really good! It tasted like cake!"

Celestia chuckled. "Oh, it did, did it? How odd. I didn't know my milk could have that kind of taste to it. Perhaps it's the lactating pills I've been taking to help me produce milk more easily."

"Mommy take medicine?" Twilight questioned with concern.

"Just for breastfeeding," The sun princess reassured her charge. "It's what mommies do for their little ones sometimes," Then she turned her attention back to Octavia and Vinyl. "Now, if you'll excuse me, I have a few messy fillies I need to clean up. Just sit right there until I get back, Twily." And she then rose from her seat at the table in order to go wipe off the faces of the two padded musicians.

After breakfast was over, Celestia led her padded charges back to the guest bedroom Twilight was staying in. She made sure to lock the door securely behind her so that nopony could barge in unexpectedly. Then she encouraged the trio. "Go ahead, go play your music. I'll be right here if you need anything."

Vinyl smiled, allowing her violet eyes to grow big as she took hold of both Twilight and Octavia by the hoof. "Come on, I've got so many tapes I wanna show you!" Soon, she had brought them before a brightly colored box. Opening the locks with her magic, she revealed a wide variety of colored cassette tapes. There was also a bright red tape player/recorder, and a pair of matching headphones.

"I can't believe you actually held onto those old tapes, Vinyl," Octavia commented in an odd mix of surprise and light mockery. "Tapes like those haven't been used in ages. These days, it's usually records, though CDs are also popular."

The off duty DJ's smile just grew bigger and brighter. "Well, these tapes were all the rage when I was a foal. I remember my parents used to play them for me all the time: When I was being put for naps or going to bed, when I was being too much of a hooful and needed to calm down, or even when we went on really long carriage rides together," Lighting up her horn, she soon settled on a bright yellow colored tape. "And guess what? This old tape player still works. Sometimes, I'll pop in a tune or two to get me in the mood." She promptly popped the tape into the player and pressed the play button.

The player clicked and came to life. Soon, music could be heard emerging from the speakers near the bottom of the device:

Row, row, row your boat,

Gently down the stream.

Merrily, merrily, merrily,

Life is but a dream.

"Think that's cool?" Vinyl said with a grin. "Check this out!" She used her magic to press the fast forward button on the player, then stopped it on a whim. A different tune started to play:

Ninety nine buckets of oats on the wall,

Ninety nine buckets of oats.

Take one down, pass it around,

Ninety eight buckets of oats on the wall.

Ninety eight buckets of oats on the wall,

Ninety eight buckets of oats.

Another press of the fast forward keep, followed by another sudden stop brought yet another tune on:

The wheels on the cart go round and round,

Round and round, round and round.

The wheels on the cart go ground and round,

All through the town.

"Vinyl, these are basic foal songs!" Octavia seemed to blush ever so faintly. "Don't you have anything less... kiddie?"

"I told you, these tapes were really popular when I was a little filly," Vinyl replied as she shrugged off the comment. "This is actually one of the special tapes my parents made for me," She proceeded to use her magic to stop the tape, pull it out of the player, and present it to both Octavia and Twilight. "See?" Scribbled in barely legible black letters were the words "Vinyl's Special Tape #1: Vinyl's Favorite Songs"

Twilight grinned. "My first mommy didn't really do songs for Shining and I when we were little, but she did have stories she used to tell us. They were always so wonderful: Stories about things like a rainbow of darkness, and witches, and ponies going on adventures to distant lands," A lone tear came into her eyes as she recalled. "I should've asked her to write them down somewhere so I'd always have them. I can't remember the last time I heard them, but it has to be have been years."

Octavia reached out a hoof to calm her fellow padded mare down. "Hey, it's alright. I'm sure your mother still recalls them to some extent and would be happy to write them down for you if you asked," She then commented. "My mother actually kept a lot of the things I had when I was a foal. Apparently, the doctors told her that after she had me, she couldn't have another foal again. That would explain why she's been almost over eager to see me have foals of my own."

Vinyl giggled. "Your mom's pretty weird, Octy. But hey, moms are like that. My mother and father made the tapes for me because they were always busy with their work, my big brother had to care for me. He was the one who got me into music in the first place. He was a DJ too, and he still performs for special occasions sometimes."

Smarty Pants, meanwhile, was rummaging through the collection of tapes the off duty DJ had brought with her. "Wow!" She commented as she carefully set various colored tapes aside. "Seems like your parents made a lot of these tapes, Vinyl! There's a tape of your favorite sounds, a tape of your favorite lullabies, even a tape of some potty training songs. I wonder if any of them are like the ones I used to sing to Twily."

Now it was Vinyl's turn to look embarrassed. "How did that get in there?!" She exclaimed in shock as she hastily snatched up a bright white colored that had the words "Potty Time" written on it. "Ugh, that's the one tape I didn't wanna bring with me!"

Octavia donned a goofy grin. "Now I'm quite curious as to what sort of songs your parents could've had recorded for you on a tape like that. I don't recall songs being a part of my potty training experience."

Vinyl quickly sought to change the subject. "Well, there's plenty of other tapes to listen to. I've got taped recordings of some of the biggest musical acts from when I was growing up. Some of these songs haven't been re-released in years!"

But Twilight got an idea! "How about, instead of just listening to tapes, we make our own tape for my mommy?"

"You mean, for Princess Celestia?" Octavia questioned, and got a confirming nod in return. "Sort of like a private concert? We make a tape of us performing a song?"

"Why not? You still have your cello with you, right?" Vinyl pointed out, gesturing to the case the aforementioned instrument currently resided in.

"But we don't have any other instruments," The earth pony mare protested. "We can't have a concert with only one instrument."

Smarty Pants then giggled. "We have all the instruments we need right here."

Octavia blinked in confusion. "What are you talking about? I don't see any instruments besides my cello."

Twilight chuckled as she waddled over to Octavia. "Duh, the instruments exist in our imagination. We can play any instruments we want. We don't even need to practice," Then she giddly proclaimed! "Ooh! I have an even better idea! Instead of taping our concert, we do it live for Mommy! She'll love it!"

Vinyl began to beam from ear to ear. "Hay yeah! Now you're talking, filly! The only thing better than taping your own music, is playing your own music yourself!" Then she put a hoof to her chin, deep in thought. "But what song should we do? It's got to be something that'll sound good with Octy's cello. Too bad foals don't know how to use turntables, because if I had my turntable I could mix up some really sick beats for us."

Octavia, meanwhile, had trotted over and opened up her cello case. With a fair bit of effort and clumsy waddling, she was able to drag the heavy instrument over to where Twilight, Vinyl, and Smarty Pants were all seated. She managed to catch the tail end of their conversation. "You know, all this talk about foals and foalish things has actually gotten me thinking. I do seem to remember this one incident at a certain gala a few years back."

At that the padded alicorn's face became flush with shame, it was even possible to hear a faint hissing sound as she peed a little bit from the sudden embarrassment. "That was Pinkie Pie, not me!"

"I know, and I'm not mad," The cello playing earth pony reassured the padded alicorn princess. "It did liven things up a bit. I believe that song was called 'The Pony Pokey' if I'm not mistaken."

"Oh, 'The Pony Pokey'," The unicorn mare commented in amazement. "I'm impressed you remember a song like that, Octy. As a matter of fact, I helped bring that song back into the mainstream with a rocking club remix. And your gala incident was just the inspiration I needed," She smiled, looking at Octavia. "What would we ever do without each other, Octy? Feels like we were meant to be. Heck, now we can even say we've been together since we were in diapers."

Octavia waved a hoof, playing off the compliment. "Oh Vinyl, it's nothing, really. I'm flattered you could find inspiration even from something I found rather embarrassing at the time," Then she happened to notice the off duty DJ's flanks, and a noticeable detail about the diaper currently wrapped around. "Speaking of diapers, did you know you just wet yourself, Vinyl?"

The off duty DJing unicorn looked down, noticing a faint yellow tint to her previously pristine white diaper. "Guess that just goes to show how much I've gotten used to wearing and using my pampers. Didn't even realize I'd opened my floodgates," She then sat down, causing her diaper to squish. "Wow! I must've soaked it more than I thought!" She looked across to Octavia. "Well, what are you waiting for? You know we're not allowed to use the potty. Aren't you gonna feel weird being the only one not getting changed?"

"Come on! It's easy!" Twilight declared as she patted her soggy diaper. "Just let it all out!"

"It's okay, Twily was just as nervous about it the first time she decided to do it," Smarty Pants reassured the earth pony. "I promise, we won't look." She covered her button eyes with a hoof and turned her head. Twilight and Vinyl promptly turned their heads too so as to give their friend the privacy they felt she needed.

Octavia sighed deeply. She didn't have much experience using her diaper, and unlike last time she didn't have the luxury of being distracted by a playtime fantasy. She shut her eyes, trying to remember the trick she'd read once about imagining a waterfall (despite not having the sound of running water that had been recommended). She spread her legs out almost involuntarily, hoping that if she relaxed her posture her body would be less likely to fight against her. It took a long time as the cello playing earth pony stood there in silence, why was she so pee shy all of a sudden?

Finally, however, the proverbial dam burst. Octavia's bladder finally emptied itself in a steady stream, the hissing became rather audible as a result. Her diaper subsequently swelled up as it absorbed the pee as best it could, soaking it all up like a sponge. Slowly but surely, the stream died down until it was a faint trickle. And then it stopped for good. She sighed in relief, taking in the feeling of a wet diaper. Sheepishly, she declared. "I'm... I'm done, I think."

Vinyl was the first to take notice of her friend's deed. She grinned and winked. "See? That wasn't so bad, was it?"

"N-no, it... wasn't." Octavia seemed to reluctantly agree.

Twilight smiled. "Now we can all get changed, and then we can start practicing for our concert for Mommy. She'll love it!"

A trio of diaper changes soon followed, and then the three freshly padded ponies went back to preparing for the concert they had agreed to put on.

Of course, Princess Celestia had overheard everything and knew about the concert. But she feigned ignorance all the same. "Twily wants it to be a surprise, so I'll be surprised. It's just like the other stuff we've been doing together as mommy and child." She thought to herself with a smile on her face.

Eventually, Twilight, Octavia, and Vinyl Scratch (and of course Smarty Pants even though she couldn't really play any instruments) believed they had practiced enough. They had no stage, but that didn't matter, much like the instruments they would create the stage with their imagination.

Twilight waddled over to Princess Celestia with an exceptionally bright smile, trying to hold back her excitement so as to not give away the surprise. "Hi, Mommy." She chipperly greeted.

"Hello, Twily," Celestia replied in that motherly tone of hers. "Are you enjoying your playdate with Octy and Vinyl?"

The padded alicorn princess nodded and then proudly said. "Yup. And we decided to do something extra special. We're gonna do a little concert for you."

"Oh? For me?" The sun princess commented as she again feigned ignorance. Sure, it might be fairly obvious given her lack of acting experience, but it was the thought that counted.

"Uh-huh!" Smarty Pants chimed in. "We're going to do a song called The Pony Pokey. And you can join in too if you want. You don't have to sing, just do what Twily and I do while we play our instruments."

Octavia then cleared her throat, cello at the ready. "And now, Princess Celestia, we are pleased to bring you..." She paused for dramatic effect, then declared. "The Pony Pokey!" And she, Vinyl, and Twilight (and Smarty Pants too) all started singing in unison. As they sang, they performed various gestures in time to the music, which went like this:

You reach your right hoof in,

You reach your right hoof out.

You reach your right hoof in,

And you shake it all about!

You do the Pony Pokey, meeting lots of folks with clout.

That's what I'm talking about.

You step your left hoof in,

You pull it right back out.

You step your left hoof in.

But you better help him out!

You do the Pony Pokey but should find a different route.

That's what it's all about.

You kick your back left in,

You pull your back left out.

You reach your back left in,

Just be brave and have no doubt!

You do the Pony Pokey, feeling like you're gonna pout.

That's what I'm singing about.

You tilt your head in,

You tilt your head out.

You tilt your head in.

Then you shake it all about!

You do the Pony Pokey even though your date's a lout,

You're better off without.

You stomp your whole self in,

You stomp your whole self out.

You stomp your whole self in,

And you stomp yourself about!

You do the Pony Pokey and you give a little shout,

That's what I'm talking about!

You do the Pony Pokey,

And that's what it's all about!

About midway through the song, Princess Celestia couldn't help but notice Twilight adopting a most unusual expression upon her face. She was about to ask what it was, before she saw her fellow alicorn spread her legs apart and lift her tail. Celestia's trained ears could hear the sound of muffled grunts even over the sound of the music.

In a matter of seconds, Twilight gave one big push and her diaper noticeably bulged in the back. A faint scent of methane began to waft through the air. Yet the alicorn went right back to singing and dancing as if nothing had happened, and nopony else seemed to notice yet what Twilight had just done.

When the song ended, Twilight still didn't seem to be aware of the fact that she had messed herself. She instead smiled as she looked upon Princess Celestia, seeing the sun princess clap her hooves in approval. "Oh bravo! Bravo!"

"Did you like it, Mommy?" The padded alicorn asked in a hopeful tone of voice.

Celestia happily nodded in confirmation. "I loved it, Twily! You and your playmates were wonderful!" She wiped a lone tear from her eyes. "You continue to make me so proud of you!"

The young alicorn princess beamed with pride. "Thank you, Mommy!"

Celestia then cleared her throat. "Well, now that your concert is over, Twily, there's something we need to discuss."

"What do you mean, Mommy? Is something wrong?" Twilight asked with concern, still apparently unaware of her dirty diaper or the stench coming from it.

The sun princess was perplexed by Twilight seemingly not knowing about having messed herself. "Does she really not know she made a poopy? Or is she just pretending like that other time?" She thought to herself, remembering her conversation with Luna a while back. But she quickly pushed those thoughts and concerns to the back of her mind as she did her best not to adopt a goofy grin, all the while she said to her former student. "Yes, something is most certainly wrong, Twily. You have a messy diaper. And it really stinks!"

"What?! Why didn't anypony tell me sooner?!" Twilight blinked in apparent disbelief as she looked to her diaper and saw a very obvious bulge spread across the back.

"I was actually just about to say something myself, but I was so caught up in my performance that I forgot," Octavia admitted in a somewhat shameful tone. "As for Vinyl. Well, I guess she's gotten used to such smells after all the late night gigs at clubs. I've never been to any myself, but they do have a certain reputation."

Vinyl just replied. "When you gotta go you gotta go."

Smarty Pants then teased. "Goodness, Twily! You sure are a stinky baby. You should hurry up and get changed before you make the whole castle smell bad!"

Celestia then levitated Twilight into the air and carried her away. "You're definitely in need of a change, Twily. And probably a bath too."

The rest of the day was a blur of fun for Twilight, who enjoyed her two musically talented playmates and playing with them just as much as she'd enjoyed all her prior playmates. The day of fun tuckered her out, and she slept soundly that night under Celestia's watchful eye.

Octavia and Vinyl Scratch both agreed to keep Twilight's secret to themselves, and they too slept soundly that night. They woke up the next morning in the private suite in the castle that had initially been reserved solely for Octavia as part of her "punishment", both feeling refreshed.

Vinyl was just packing up her tapes and getting ready to catch the train back to Ponyville, when she happened to notice something taped to the door of the suite. "What's this?" She wondered aloud as she took it off the door with her magic. It was a letter, and she read it aloud:

Dear Octavia Melody and Vinyl Scratch,

Thank you ever so much for agreeing to be Twily's playmates, and for agreeing not to tell others about her secret. It makes me happy to know that Twily can be herself around ponies like you without fear of being judged or made fun of.

I do hope you will consider coming back for another playdate some time, Twily really enjoyed spending time with you two. And the little concert you helped her stage for me was most appreciated. It was adorable.

As I promised before, you will be greatly rewarded for your services. I hope you'll both appreciate it. And Vinyl, don't worry about Octavia, I assure you that word of her private performance for my sister's birthday and what it means will not be leaked out.

Sincerely,

Princess Celestia

"What do you think she means, Octy? I mean, Tavi?" Vinyl Scratch blinked, quickly correcting herself as she resorted to the more appropriate nickname for her roommate when they were not padded up.

But Octavia didn't reply, she was too busy looking at something else. For she too had received a note, and was currently reading over it very carefully. At last, she turned to the off duty DJ and told her. "I just got word from my mother, Vinyl. You will never believe this: She's actually expecting another foal!"

"What?! No way!" Vinyl exclaimed in disbelief! "After all this time? How is that posi..." Then it dawned on her. "That must be the reward Princess Celestia had in mind." She thought to herself, and smiled. Hopefully, now Octavia's mother wouldn't be in such a rush to see Octavia married and settled down with foals. And that would mean that Vinyl could have Octavia all to herself.

Big Sis Velvet (Twilight Velvet)

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Author's Notes:

To my knowledge, this is the first ever padded pony fic where Twilight Velvet is a foal and not a caretaker. To celebrate that, here is a picture of Velvet in diapers:

Anyway, I decided to go with the headcanon from Blown Together: a Night Light & Twilight Velvet Adventure in that Velvet is a former student of Princess Celestia. I also drew a little bit on inspiration from FabulousDivaRarity, who wrote a lot of headcanon stories involving Twilight Velvet and Shining Armor, particularly on the inspiration that Velvet breastfed her children even after they were old enough to no longer require it.

Since no one proposed any ideas for what Velvet could do with Twilight, I decided to draw on the popular headcanon of Velvet being a writer, as well as her canonical personality of being a thrill seeker. Two of the books read here are references to other padded pony works I've been part of, one now defunct.

Now, in light of the votes that have been received so far, here's what I'm going to do for the next chapter. First, I'm going to list all the characters ineligable for the fic under any circumstances, then list the ones that cannot be done solo anymore. After that, I'll list the characters who have received votes in rounds prior. Spitfire will get two half votes, equaling one full vote. But if she ties with any character not on the list, that character will have priority.

Characters ineligable under any circumstances:
Starlight Glimmer
Discord
Trixie
Sunburst
Cutie Mark Crusaders
Flurry Heart
School aged or younger children (i.e. Cake Twins)
Characters introduced after Flurry Heart (Starswirl the Bearded, the Pillars, Star Tracker, Mudbriar, etc.)

Characters that can only be done in group pairings:
Mane six
Spike
Princess Cadence
Shining Armor
Princess Luna
Octavia and Vinyl Scratch
Twilight Velvet

Characters previously voted on:
Spitfire - One vote
Lightning Dust - Half a vote
Moondancer - Half a vote
Cheerilee - Half a vote
Maud Pie - Half a vote

As always, feel free to not only suggest characters to be playmates for Twily, but also what they can do with her. But keep it SFW, nothing sexual.

Twilight's next playmate came as quite a shock to the padded alicorn in more ways than one. The first shock was when Princess Celestia took the liberty of waking her charge, and introducing the playmate directly. All the while, Celestia maintained that motherly smile of hers as she checked Twilight's diaper, finding it dry. "I hope you don't mind, Twily," Her smile grew brighter. "I have a feeling you'll recognize the pony I brought here to be your playmate today. She practically begged me to let her play with you after she found out that your big brother also got to play with you."

A gasp escaped Twilight's mouth! "You mean...?!"

Nodding, the sun princess stood aside, and from behind her trotted a very familiar unicorn mare with a snow white coat. Her mane and tail consisted of snow white locks and very light purple streaks in the same skunk stripes as the pink one in Twilight's mane. And of course, said mare was clad in an overly thick, poofy diaper that hugged her rear tightly. Waddling forward in a somewhat clumsy fashion, the mare cleared her throat and smiled. "Hello, Twily! Surprised to see me?!"

The padded alicorn's jaw dropped wide open in disbelief! "Mommy Twilight?!" She exclaimed in profound surprise! Was this all a dream despite how real it felt? Never in her wildest imagination had she given any thought to having either of her parents not only find out about her secret, but also partake in it with her.

Twilight Velvet happily nodded, then giggled. "Yes, it's me. Although, since Princess Celestia is already your mommy here, I'm really more of a big sister to you: Big Sis Velvet," A blush formed on her cheeks. "Gosh, it feels so... strange to see you back in diapers. I remember how, compared to Shining Armor, you took to potty training so well. You were out of diapers before I stopped breastfeeding you."

"H-how... how is this possible?!" Twilight stuttered in disbelief! She didn't know what else to say, or even what she could say.

Velvet smiled "It's really quite simple, Twily. You're okay with me calling you that, right? I know you used to find that name so embarrassing whenever Shining Armor or Cadence would use it," Then she coughed into a hoof, before flashing a knowing wink at Princess Celestia. "Anyway, Princess Celestia already kept me informed of your little secret from the moment she found out about it. She was so worried about being your mommy, she wanted to make sure I wouldn't be jealous. Fortunately, I was more than happy to let her baby you to her heart's content. I even let her borrow my lactating pills that I kept just in case of an emergency."

Princess Celestia then added. "Velvet and I were already pen pals. She was once my student the same way you were, Twily. You were a lot like her, actually, aside from the fact that you weren't quite as adventure loving as she was and still is. And it seems that thrill seeking nature led her to ask that I let her be your new playmate," Giggling and trying to suppress a smirk, she went on to say. "Even if it means she goes back to diapers. Luckily, your diapers fit her pretty well. With a little bit of magical adjusting to fit her size and weight, of course."

Velvet proceeded to poke at her padding with a hoof, delighting in the crinkles it gave off as it compressed. "I needed a break from my writing desk anyway. I've been struggling to think of how to end my latest novel. And this seemed like the perfect distraction," Then she asked. "Now, are you gonna introduce me to Smarty Pants? I know how attached you two are. And any friend of yours, Twily, is a friend of mine."

The young, padded alicorn nodded quite slowly, still trying to process the idea of her female parent playing the role of a big sister. It was a lot to take in on short notice. Nevertheless, she trotted over to her bed and grabbed Smarty Pants from her resting place next to the pillow at the head of the bed. "Hey, Smarty Pants," She said to the old doll. "You'll never guess who Mommy got as my next playmate. It's my other mommy, the one who was my mommy before Princess Celestia became my mommy."

"Hello, Mommy Twilight," Smarty Pants greeted in that exaggerated tone of voice that made it so easy to tell it was really Twilight speaking. "I didn't know a pony could have two mommies, or that mommies and daddies wore diapers. Twily's mommy never wears them, she uses the potty."

Velvet couldn't help but snicker. "Well, I'm not Mommy Twilight today. Twily already has a mommy, but she doesn't have a big sister. You can call me big sis Velvet, or big sissy. After all, I'm wearing diapers too." She promptly and proudly showed off her poofy, padded posture, patting it with a hoof.

Smarty Pants commented. "Hey, aren't those Twily's diapers? You should've asked, I'm sure Twily wouldn't mind sharing them."

Velvet blushed. "Sorry. I was just so excited about the chance to play with Twily that I guess I forgot about asking. But her mommy said it was okay."

Twilight then replied. "It's okay, Smarty Pants. My mommy buys me plenty of diapers. I don't mind sharing a few with big sissy. Diapers are better than the potty anyway."

"Oh yes, definitely." Smarty Pants agreed.

"Oh come now, Twily," Velvet encouraged. "I'm sure you'd get to like the potty if you just gave it a chance."

But the sun princess waved a hoof. "Oh, it's okay. I don't mind changing Twily, no matter how stinky she gets. If she doesn't want to potty train, she doesn't have to. Mommy wants what's best for her little filly."

"Exactly!" Twilight beamed, hugging her fellow alicorn. "You're the best mommy ever, Mommy!" Then, with a blush, she turned to Velvet and said to her "other mommy". "No offense."

The elder Twilight shrugged off the remark with indifference. "None taken."

Smarty Pants then asked. "So, what should we do first... Mo... er big sis?"

The elder alicorn with a majestic white coat quickly proposed. "Well, what about story time? We've never done that before, have we, Twily?"

Velvet pouted. "Aw, that's no fun. I wanna explore the castle! I might not get another chance like this for a really long time."

Twilight seemed to be intrigued by the idea proposed by the padded unicorn. "Yeah! We should explore the castle with Mommy! It'll be like an adventure!"

Princess Celestia rejected the idea. "Maybe later, my little ponies. I don't want either of you getting into trouble."

"We wouldn't cause trouble. We'd be good, wouldn't we, Twily?" The elder Twilight suggested.

Twilight firmly nodded. "Yeah. I'd even use the potty if you wanted me to, Mommy. If I did that, would you let us explore the castle with you?"

Celestia again shot down the idea. "I wouldn't want any of the castle staff to get the wrong idea about you, Twily. I would first have to make sure none of them promised to tell anypony about it, and that there are no visiting delegates or other important ponies who might see you. For right now, you and your big sis will stay here and listen to the stories I'm going to read you. If either of you wants to use the potty, you can. But only if I'm there to supervise you." And with that, she used her magic to pull out a small table and some chairs, along with a stack of books that looked surprisingly foalish in design and cover.

"Guess we'll just have to wait another time to go exploring. But that's okay, we can still have fun here." Smarty Pants commented.

"Yeah, I guess so. Reading can be a great way to escape from reality," Velvet declared. "I know how much you loved the stories I used to read to you, Twily. It's always a good idea to inspire a love of reading and learning at a young age," And she chuckled. "You were so smart you practically ran your potty train all on your own. I barely had to do anything," She paused and wiped a tear from her eyes. "Sorry, I'm getting sentimental. Guess seeing you in diapers really brings back memories."

Twilight simply nodded back in silent approval, then joined Velvet as the two padded ponies promptly planted their poofy, padded postures onto the seats. Smarty Pants was seated off to the younger Twilight's left, while Princess Celestia took up a seat at the opposite end of the table. Much to the surprise of both Twilights, they found small paper plates filled with food, and sippy cups filled with apple juice.

The sun princess flashed a motherly smile. "Before we start reading, how about my little ponies have a snack? Baby carrots and applesauce. And if you both behave, I'll let you have freshly baked cookies for dessert."

"Oh boy, cookies!" Twilight eagerly exclaimed as she licked her lips in anticipation!

Velvet, meanwhile, commented. "Baby carrots have always been Shining Armor's favorite. I should make them for him the next time he comes home for a visit."

The two Twilights greedily devoured their snacks, scarfing down the baby carrots and applesauce even as they got traces of said applesauce all over themselves.

Rather than frown upon the lack of table manners displayed by the little ones, the elder alicorn just smiled that motherly smile of hers before levitating over a wet rag. "Goodness, you two must've been hungry!"

Velvet nodded and grinned. "We sure were. I didn't even realize how hungry I was until I started eating the baby carrots."

"Well, I hope you two have room for dessert," Princess Celestia declared as she levitated over a much larger plate. "A deal's a deal, here are your cookies."

Smarty Pants let out a sigh of regret. "I wish I could enjoy food like baby carrots and cookies. But I can't. I'd just make a mess."

"Hey, don't feel bad," Twilight said to the old doll. "You can do all kinds of things that I can't. You could sit on a potty made of Legos without getting hurt. I could never do something like that."

Velvet chimed in with her own sentiments. "I remember how much Twily used to toss you around and bang you against things like you were a drum, Smarty Pants. But you never complained once, and you held up really well despite all the punishment you took. And I haven't forgotten how you used to sing to Twily whenever she was on the potty, helping her tinkle."

"Big sis!" The padded alicorn playfully whined.

The padded unicorn just chuckled. "I was just trying to cheer up Smarty Pants the way you were, Twily," Then she apologized. "I'm sorry if I embarrassed you in front of Mommy."

Celestia sweetly replied. "It's alright, I don't think any less of Twily for that. It just tells me that Smarty Pants was the first friend Twily ever had, long before she had the courage to make other friends. And it warms my heart to know that, even from a young age, she could appreciate the magic of friendship and experience its wonders first hoof."

"Enough chit chat!" Twilight eagerly declared as she reached out a hoof to the plate of cookies! "I want cookies!"

The sun princess, however, gently yet firmly swatted Twilight's hoof away. "Now now, Twily. You mustn't touch that plate. Those cookies are hot. You could burn your hoof and get an owie. We wouldn't want that, would we?"

The padded alicorn seemed to whimper in reply. "No we wouldn't. Owies are no fun."

"Exactly!" Princess Celestia declared as she lit up her horn. "I will put the cookies on plates for the both of you. But let them cool off for a minute or two first. You should never touch or put anything in your mouth that is hot. Not unless you want to see how ouchie burns can be."

So both Twilights reluctantly waited as the steaming hot cookies tempted them, the aroma wafting through the air and tickling their noses. At last, however, they were given the encouraging nod from the sun princess. And together, elder and younger Twilight devoured the cookies on their plates in record time. After which, the two padded ponies leaned back in their chairs, letting out hearty belches.

Celestia once more cleaned her charges' faces, then set the plates aside for washing later. Then, she rose from the table and motioned for the padded ponies to do the same. Soon afterward, the non-padded alicorn sat down and brought the stack of books over. "Alright," She cleared her throat. "Which book should we read first: The Legend of Gusty the Great?" She floated over a violet red colored book that depicted a greenish-gray unicorn mare. "Goldiehoof and The Three Ursas?" Next to be floated over was a bright red colored depicting an earth pony filly with curly gold locks, two ursa majors, and an ursa minor. "Daring Do and the Temple Toilet?" This book was the same green as the first Daring Do book, but depicted a filly Daring Do sitting on a giant toilet. "Captain Padding v.s. The Potty Monster?"

Velvet let out a gasp! "Hey, that's one of my books! I was inspired to write it during Shining Armor's potty training the first time he tried to go potty all by himself. I had to change names and change some of the details, but the inspiration just struck me."

"Wow!" Smarty Pants exclaimed with amazement! "Did you ever write any books about Twily when she was a foal?"

Velvet firmly nodded. "I most certainly did. One of them even helped me win the coveted Daring Do Award."

Princess Celestia chuckled. "Oh, I had no idea you wrote such books, Velvet. I guess it's settled, then," She floated over a dark blue book depicting a toddler unicorn colt that looked suspiciously similar to Shining Armor. "I'll read Captain Padding v.s. The Potty Monster first," Using her magic, she opened up the book and cleared her throat, beginning to speak in an exaggerated tone of voice. "This is a story about how Captain Padding battled and triumphed over his greatest nemesis: The Potty Monster, a monster that prayed on innocent colts and fillies trying to be big kids."

"And so, with the vicious Potty Monster vanquished forever, Captain Padding had made the bathroom safe for colts and fillies of all ages," Princess Celestia spoke as she finished reading the book. "And in the process, he himself had proven that he was more than worthy to wear his big pony pants. From that forward, he was Captain Padding no longer. He was now Captain Pull-ups. The end."

Both Twilights clapped their hooves, signaling their praise and approval of the story as they sat upon the floor.

Celestia then levitated over a book that she knew the younger Twilight had always regarded as one of her favorites: The Legend of Gusty the Great. Soon, she had opened it up to the first page and begun to read it. As she did so, she could see both Twilight and Velvet shifting about on their diapers from time to time, trying to get as comfortable as they could. It warmed her heart to see Twilight getting along and playing along so well with her first mommy. And Twilight Velvet seemed to be taking to the role of "big sister" very well, as if she'd done it all before.

Compared to Captain Padding v.s. The Potty Monster, The Legend of Gusty the Great was full of "big words" that the sun princess had to pause and explain to Twilight and Velvet what they meant. Yet she could still easily judge how much they loved the story from the way they were sitting and staring up at her, their eyes conveying that she had their full and undivided attention.

At last, Princess Celestia finished the story, reading aloud. "Thus did Gusty the Great pave the way for the land of Equestria to come into existence. With Grogar, the father of monsters defeated and sealed away within his bewitching bell, he would never again threaten or terrorize anyone ever again. And Gusty the Great and the ponies lived happily ever after."

"Wow! That was even better than Mo... er big sis' story!" Smarty Pants commented in amazement. "Gusty the Great sounds like a really brave pony, even braver than Shining Armor or Princess Celestia!"

"When I grow up, I wanna be just like Gusty the Great!" Twilight proclaimed in an exaggerated tone of voice as she puffed out her chest and stood up! "I'm not gonna be afraid of anyone or anything! I'll go on death-defying adventures with friends, right wrongs, and triumph over evil!" Yet she then lost her balance and fell backward, causing her padded rump to crinkle and squish underneath her.

Hearing that squish immediately prompted Celestia to get up from the chair she had been sitting in. She sniffed the air as she trotted over towards Twilight, eyeing her diaper with a trained eye. A closer inspection revealed that it was visibly soaked, and had been for some time. "Twily, why didn't you tell me you'd pee-peed yourself?" She scolded in that motherly tone of hers. "You could've gotten a rash."

Twilight's face flushed red with embarrassment. "Sorry, Mommy," She sincerely apologized as she felt herself be levitated into the air in front of Velvet and Smarty Pants. "I was just focusing on the story and all those voices you were using. I guess I didn't realize I went potty."

Princess Celestia just sweetly smiled as she levitated her fellow alicorn onto the changing table. "Well, I guess it's a good thing you gave yourself away with that squish. But next time, if you feel like you need a change, just say something. Story time or playtime can always be paused for diaper changes. We always want to change as soon as possible to avoid rashes." With trained precision, she swiftly undid Twilight's soggy old diaper and removed it, tossing it into the trash. Then she levitated over some wet wipes, sprinkled in some foal powder, and as a precaution worked in some rash cream. After that, she fastened a new diaper to Twilight's rump and then helped her charge down from the changing table.

"Thank you for changing me, Mommy," Twilight hugged the older alicorn anew. "Sorry I didn't tell you sooner, maybe we could've tried to get me on the potty."

"It's alright, Twily. I want you to do whatever makes you feel comfortable and cared for," The sun princess sweetly replied. "If you prefer your diapers to the potty, I won't force you to give them up," But as the two alicorns made their way back to Velvet's location, the smell Princess Celestia had smelled returned anew. "Hm, now that's odd. I thought the smell was coming from you, Twily. Did you toot?"

The padded alicorn shook her head from side to side. "No, Mommy, I didn't toot."

Celestia quickly realized that such a statement could mean only one thing. And sure enough, when she inspected Velvet's diaper, she could tell that the stench was emanating from there.

Smarty Pants giggled and teased. "Big sis made a poo-poo!"

"Smarty Pants, that's not nice!" Twilight scolded the doll. "You don't make fun of me when I go poopy! Mo... er big sis couldn't help it."

Velvet nodded, apparently not bothered by the strong smell wafting through the air. "Yeah. Besides, even big sisters have accidents from time to time," Then she looked up at Princess Celestia. "Sorry I didn't say anything sooner. I didn't want to be a burden."

The sun princess just replied by lifting her former student into the air not unlike the way she had carried Twilight earlier. "Well, you've most definitely earned a change, you stinky filly!" She playfully teased! "Goodness! You're just as stinky as Twily! It must run in the family or something!"

"I guess so." Velvet sheepishly admitted as she watched Twilight and Smarty Pants turn their heads so as to give her some much needed privacy. It was truly a surreal experience for her to have her dirty diaper be changed by the princess. But at least it did make her feel young again.

Luckily for everyone, Princess Celestia was just as swift at changing Velvet as she was at changing Twilight. In no time at all, she had gotten the unicorn changed into a fresh, clean diaper. The old, dirty diaper was tossed into the trash and then bagged up. And with the flick of a horn, it was teleported away, taking the foul smell with it.

Story time then resumed with no further interruptions, until both Twilights' eyes started to droop. Celestia knew what that meant. She paused in the middle of the book she was reading, inserting a paper stub to serve as a bookmark. Then she set the book down on a pile and got up again. "I think it's time for all good little ponies to take their naps." She motherly cooed to them.

"But... we're not tired." Twilight insisted, before betraying her argument with a yawn.

The elder alicorn simply trotted over, helping both padded ponies to stand. "Oh yes you are. This is not up for argument. Besides, I have some grown-up things I have to get done. So this works out for the both of us: You two will take a nap together, and I'll get all my grown-up things done. Then, when you both wake up, we'll have nothing to interrupt our play time together."

"Okay." Both Twilight and Velvet reluctantly yawned in agreement.

Celestia led both her charges back to Twilight's bed, carefully tucking Twilight and Velvet in together and placing Smarty Pants firmly within Twilight's hooves. Then, she lit up her horn and floated over two baby bottles filled with milk. "This should help you both to go to sleep faster."

Twilight eagerly grabbed a bottle when it was presented to her, wrapping her mouth firmly around its rubber nipple as she began to suckle on it. She was surprised by its rich, creamy taste. "Could it be?" She thought to herself, and slowly turned towards the sun princess. "Mommy?" She asked the non-padded alicorn.

"Yes, Twily?" Princess Celestia sweetly asked in reply.

"Is this... your milk?" The padded alicorn inquired.

Princess Celestia confirmed with a gentle nod. "It most certainly is. I had it prepared this morning. I won't always be there to give it to you directly. This way, you'll always have a part of me close to you no matter what," And she motherly encouraged. "Go on, drink it up. Your big sister has already finished her bottle." Sure enough, if one looked to Velvet, they would see the padded unicorn had drank every last drop of milk in the bottle given to her.

So Twilight turned her full attention back to the bottle given to her, and closed her eyes as she tried to imagine the sound of Celestia's gentle heartbeat. Slowly but surely, she suckled down the milk, yawning as she felt herself grow drowsy. A warm bottle of milk fresh from the sun princess, coupled with a full belly from snack time, was enough to make her nod off.

"Twily, wake up." The gentle, sweet, and playful tone of voice of Velvet called out sometime later.

The padded alicorn slowly opened her eyes, surprised to see Velvet staring right at her from the bed. There didn't seem to be a sign of Princess Celestia anywhere. "Where's Mommy?" She asked as she slowly sat up.

"I don't see her anywhere, Twily." Smarty Pants admitted as she looked around the room.

Velvet smiled. "Sorry for waking you up, Twily. But I just couldn't sleep for very long. I want to play and explore. And this is the best opportunity to do so!"

Twilight gulped and swallowed hard. "But won't we get in trouble if Mommy finds out?" She shuddered as she remembered what had happened the last time she'd disobeyed an order. The punishment was still fresh in her mind.

Velvet flashed a knowing wink. "We won't be gone for long. We'll be back before she ever finds out we're missing. It'll just be our little secret," She seemed to be all but bouncing up and down in excitement! "Come on! Don't you wanna have more fun with your big sister?! Don't you wanna see what kind of cool things we can discover together?! You said you wanted to be like Gusty the Great and have adventures."

Reluctantly, Twilight got up from the bed, tossing aside the sheets as she did so. "Smarty Pants, you stay here!" She told the old doll. "If Mommy comes back," She used her magic to hastily pull the covers back up. "Pretend that we're all still sleeping, and don't tell her where we are."

"Don't worry, Twily," Smarty Pants declared. "I'll cover for you and for big sis. You two have fun on your little adventure together. When you get back, be sure to tell me about it."

Velvet then eagerly grinned from ear to ear, all but racing to the door of the royal suite she and Twilight were in! "Come on, Twily!" She encouraged! "The sooner we leave, the better our chances of getting back before Mommy finds out."

After looking back to the bed to make sure Smarty Pants was well hidden and out of sight, the padded alicorn followed the padded unicorn to the door. Together, they opened it and stepped out into one of the castle's main long and winding hallways.

Where they would go, the padded duo didn't know. And that just made the adventure seem all the more exciting to the ponies.

Yet it wasn't long after wandering around that both Twilights became aware of the sound of hoofsteps in the distance! And it sounded like the hoofsteps were drawing closer!

Twilight let out an eep! "I can't let anypony else see me like this!" She frantically insisted as her eyes darted all about, looking for a place to hide until the danger had passed!

Velvet looked around. Suddenly, her eyes fell upon a lonely broom closet nearby. Grabbing Twilight by the hoof, she whispered in a hushed tone! "In here!"

The two padded ponies promptly ducked into the broom closet, shutting the door behind them as the sound of hoofsteps grew louder still! The broom closet was cramped, cold, and dark, not to mention dusty. Yet it was the only sanctuary both Twilights could think of at a moment's notice. They had to resist the urge to cough or sneeze despite the accumulated dust, fearful of giving away their position as the hoofsteps sounded as if they were passing by right outside the closet.

It was only a few seconds, but to Twilight and Velvet it felt like forever. Yet the sound of the hoofsteps gradually faded away into the distance. Emerging from the closet, both padded mares caught the faintest glimpse of the hoofsteps' source: Two royal guards conducting their patrols, appearing to be chattering to one another. But they were too far away to be heard.

Twilight breathed a sigh of relief. "That was too close!" She said to herself.

Velvet seemed to nod in agreement. "I almost pee-peed myself in fright, I was so scared," And then and there she decided. "You know what, maybe this wasn't such a good idea. We can have plenty of imaginary adventures right in the comfort of the suite. We don't have to go waddling around the castle, looking for trouble."

"Are you sure about that Mo... er big sis?" The padded alicorn asked.

Velvet nodded again, more slowly and reluctantly this time. "Yes, Twily. After all, I don't want you to get into any trouble with your mommy. As a big sister, I have to be responsible. That means putting your needs ahead of mine. Besides," She crossed her legs. "I have to go potty."

"Why not just go in your diaper like I did? You already did a poo-poo in it. Pee-peeing in it shouldn't be any harder." Twilight pointed out.

Velvet just turned and trotted back to the door leading to the royal suite. "Having an accident is one thing. Intentionally using your diaper is another. I'm a big sister, I have to try to make it to the potty whenever I can, even if I'd rather use my diaper." She had soon gotten the door open, and trotted back through it.

The padded alicorn watched as the elder Twilight, once safely back in the suite, made a beeline for the bathroom and shut the door behind her. Soon, there came the sound of rustling and crinkling, followed by the sound of hissing and tinkling echoing into a porcelain bowl.

"Ah, just made it." Velvet sighed in relief. Soon, she had finished peeing. She proceeded to wipe herself, then flush the toilet. But then, it was as if an idea came to her. She didn't get off of the toilet like Twilight had been expecting. Instead, there came the sound of a splash!

A horrified Twilight opened the bathroom door and rushed in! "Big sis!" She cried out as she looked around the bathroom in distress!

Fortunately, Velvet could be seen sitting inside of the toilet bowl. Her discarded diaper lay on the floor immediately in front of the toilet, still fresh, powdered, and pristine. "I'm okay, Twily. I just fell in, that's all." She delivered that line with a wink, suggesting that she hadn't "accidentally" slipped off the seat.

A gulp formed on the padded alicorn's face as she eyed the toilet. "But if you're inside the potty, doesn't that mean you'll go down the drain?"

The unicorn mare flashed a reassuring smile at the alicorn. "No I won't, I'm too big to fit down it. And so are you."

"How can you be so sure?" Twilight asked, still unconvinced.

"Well, why don't we find out together?" Velvet encouraged as she continued to sit in the toilet bowl, letting the water swirl underneath her flanks. "Come on. There's nothing to be scared of. The water's fine. And if we go down the drain, we go down together. Just imagine what an adventure that would be if that happened. But it won't, we'll be just fine. I promise."

Against her better judgment, Twilight approached the toilet. She undid her diaper and let it fall, then she hesitantly climbed over the seat and into the bowl. Between her and Velvet, there was no room at all for anything or anypony else. They just barely could squeeze into the bowl together.

"Ready?" The elder Twilight looked across to her now un-padded daughter, sounding more like somepony about to go on an exciting zip line or barrel drop as opposed to somepony potentially about to be flushed down the toilet.

Swallowing hard and summoning up courage, Twilight nodded back to Velvet. "R-ready as I'll ever be."

Velvet smiled, then surrounded the handle with her magic and forced it down! "Okay, here we go!" The flush cycle soon began, the waters in the toilet bowl underneath the two ponies surging and swirling around them. It felt like something was trying to pull on their tails and drag them down, but it wasn't strong enough to do so. Instead, the waters just swirled and spun around them, then retreated down the drain as the flush cycle ended. The water in the toilet slowly refilled, and the two ponies sitting inside the bowl hadn't moved. They had not gone down the drain.

The padded ponies climbed out of the toilet a moment later and shook themselves dry, before the elder Twilight declared. "See, Twily? I was right. We didn't go down the drain, and we never will. So now you know the potty's nothing to be scared of. You're big enough to have nothing to fear even if you should ever fall in," Then, she turned her attention over to the nearby bathtub, and used her magic to turn on the tap. "Now let's take a bath, just so we don't get sick from being in that toilet water. I'm sure it was clean, but this is just to be safe."

A nice warm bath, even if it was without bubbles, certainly helped Twilight to relax. She had most certainly enjoyed her play time with her "big sister". It reminded her a lot of the play time she and her brother had gotten into before life had inevitably taken them in separate directions.

When the bath had ended, Velvet stepped out of the tub first, stepping onto some pre-placed towels she had levitated over. As she watched her playmate climb out of the tub seconds later, she wrapped towels around the alicorn's body and helped her to dry off. "This has been so much fun, Twily," She said to the alicorn. "You've really helped me to feel young again."

Twilight smiled. "I'm glad I could help. You're an excellent big sister. My B.S.B.F.F.: Big sister best friend forever!"

"Oh, it warms my heart to hear you say that!" Velvet happily exclaimed as she hugged the still towel wrapped younger Twilight. Eyeing the toilet again, she then had an idea. "You know what, Twily? While we're here, why don't we try to get you on the potty? See if maybe you can do a poo-poo in it."

"Are you sure? I don't think I really have to go." Twilight hesitantly replied.

Velvet encouraged in an almost motherly tone of voice. "Come on, Twily. Don't you wanna try to be a big pony like me and like your mommy? If we can do it and Smarty Pants can do it, so can you!"

Sensing how much the elder Twilight really wanted her to at least make an honest attempt, the alicorn reluctantly approached the toilet as the towels were removed from her body. She was still hesitant to sit down on the seat, but managed to will herself to do so.

"Now just relax," Velvet told the younger Twilight. "You don't have to sit for very long. I just want you to try. If you don't do anything, that's okay."

Yet as the still unpadded alicorn sat on the toilet, she suddenly felt a faint urge building up inside of her. She could probably ignore it and wait for it to die down, even knowing that she would have to do it later. But instead, she grunted and started to push as her tail hiked upward. Her face turned red as she continued to push. Since it had been so long since she'd done this in a toilet and not a diaper, her body was fighting against her. Yet she was eventually rewarded for her efforts when she felt something move within her, heard an audible plop and then a splash.

The elder Twilight clapped her hooves in praise! "Way to go, Twily! I knew you could do it!"

The alicorn mare was sure she knew what she had done. Yet she still looked down anyway, and saw that indeed she had gone potty in a toilet. "I... I did it! I went poo-poo in the potty like a big filly!"

"Indeed you did, Twily," The familiar, motherly voice of Princess Celestia declared as the sun princess came trotting into the bathroom. "I'm so proud of you for once again facing your fear head on. And I hope that, now that you've done it once, you can try to do it again. At least once a week if possible, I would like you to try to go potty like a big filly. I don't mind changing you even if you don't, but diapers are expensive. Going potty like a big filly would help make your diapers last longer."

"I guess I can try, Mommy," Twilight agreed, before blushing and asking. "Um, is it okay if I ask you to help me wipe?"

"Certainly, Twily," The elder alicorn agreed, using her magic to do just that. And as she then flushed the toilet, she turned to Velvet and said to her. "Thank you for all your help today, Velvet. You've been an excellent playmate for little Twily."

"Think nothing of it, princess," Velvet waved a hoof. "It was my pleasure."

Twilight Velvet was more than a little bit disappointed when the next day rolled around and she had to go back to work. True, the time away from her writing desk had been memorable and enjoyable. She was now bursting with inspiration, and couldn't wait to put the ideas down on paper!

Yet as the unicorn mare entered her writing studio, ready to sit down and finally finish that novel she had been struggling for months to complete, she was surprised to see a vial containing a purple colored liquid substance. And attached to the vial was a note. Picking up the note with her magic, she examined it carefully. It read:

Dear Twilight Velvet,

Thanks again for agreeing to be diapered and playing the role of Twilight's big sister. I can tell she really enjoyed it, just as much as all the other playmates she's had since I started treating her as my baby. It warms my heart to know that I can confide this in you without fear that you'll be jealous.

Never being able to have foals of my own, it always feels great to be able to treat Twilight as if she were my daughter and treat her like a foal to our hearts' content. None of this would be possible without your support and advice. You are an excellent mother, and I know you'll make an excellent grandmare to Flurry Heart.

Here's a little something to reward you for your efforts. This should definitely help you feel young again, without you needing to go back to diapers.

Sincerely,

Your former teacher,

Princess Celestia

P.S. Thanks again for the lactating pills. They make it so much easier to breastfeed Twily. You're right, she is still very independent despite that. You raised your kids right.

So Twilight Velvet unscrewed the lid of the vial and brought its contents to her lips. Without hesitation, she chugged down the whole thing, drinking every last drop. When she had finished, she felt an odd tingling sensation. And then suddenly, there was a thick puff of smoke!

When the smoke cleared, Velvet saw what she looked like in a mirror. She could hardly believe her eyes! Staring back at her was a much younger version of herself! She had regressed back to the age she had been when, as a filly, she had become a student at Celestia's School for Gifted Unicorns.

The now filly aged Velvet chuckled. Boy would her husband be surprised when he came home and saw her like this.

Spity (Spitfire)

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Author's Notes:

The only suggestion I got for this chapter was from Tiber Septim II, who suggested that Twilight should play train with Princess Celestia. Scootabom1 did propose the idea of Spitfire being recruited due to her having issues with children (which was established in Friends Forever #11).

In case you're wondering about Spitfire's comment about not being captain, in this fic's prequel the Rainbow Dash chapter ended with Rainbow being promoted to captain of the Wonderbolts. So I wanted to make sure that was acknowledged.

In keeping with the new rules I established in the previous chapter, any character previously voted for will receive only half a vote if they are mentioned again. But any character not previously mentioned will get a full vote. And I will also remind you of characters that are ineligable to be voted for.

Characters that can only be done in group pairings:
Mane six
Spike
Princess Cadence
Shining Armor
Princess Luna
Octavia and Vinyl Scratch
Twilight Velvet
Spitfire (with or without Wonderbolts)

Characters previously voted on:
Lightning Dust - One and a half votes
Moondancer - One vote
Cheerilee - One vote
Maud Pie - One vote

"Come on, Twily," Princess Celestia encouraged in that cooing, motherly tone of hers as she plopped her fellow alicorn onto the toilet seat. "You did it for your brother and for your big sister. I know you can do it for me if you really try."

"But I don't want to, Mommy." Twilight pouted. It was hard to tell if she was being sincere or just acting up to play up her role.

Celestia simply smiled, pulling down Twilight's diaper. "You promised me you'd try at least once a week. If you really don't have to go potty, I won't force you to go. But you have to at least try," She then stood off to the side. "Don't worry, I'm right here in case you need anything. I won't let anything bad happen to you, I promise. Besides, you wouldn't want the first impression of your next playmate to be you in a dirty diaper, now do you?"

"But they'd be in diapers too," Twilight replied and giggled. "Even B.B.B.F.F. and big sissy wear diapers. Even Smarty Pants wore them once."

"Yeah, and they were super comfy. I wish I could be in diapers all the time just like you, Twily." Smarty Pants cheerfully chimed in.

The sun princess could only chuckle in response. "Maybe, but I still want you to try just the same, Twily. It doesn't have to be a poo-poo, it can just be a pee-pee."

Minutes seemed to pass by slowly as Twilight sat on the toilet, her diaper pulled down to her knees while Princess Celestia and Smarty Pants looked on with watchful eyes. But at last, the younger alicorn rose from the toilet. "I'm done, Mommy. I don't have to go."

Celestia decided it best not to press the issue any further. After all, part of her really didn't want Twilight to ever get out of diapers. "Okay, Twily. We can always try later if you think you want to. And remember, you're only allowed to use the potty with my supervision unless I say otherwise." She then pulled Twilight's diaper back off and led the padded alicorn out of the bathroom.

And just in time, too. Because at that moment, there came a knock at the door to the royal suite the two alicorns were in. The alicorn with a majestic white coat smiled, she knew who was on the other side. Lighting up her horn, she opened the door.

In strolled a pegasus mare clad in a navy blue flight suit. Yet it was possible to make out her gold coat and fiery orange mane and tail. A part of her still looked a bit unsure if the look in her eyes was anything to go by. "You sure this is gonna help me overcome my problems with kids, princess?" She spoke in her signature raspy tone of voice.

Immediately, Twilight's eyes went wide! She couldn't believe who it was! "Spitfire?!" She exclaimed, before hastily retreating behind Princess Celestia! "Y-you're not supposed to see this!"

But Spitfire only gave a light laugh. "Relax, princess, Princess Celestia already filled me in on the details. I promise, your secret's safe with me. After all, I know a thing or two about keeping embarrassing secrets." She seemed to blush a bit as she said that.

Nervously and reluctantly, the padded alicorn waddled out from behind Celestia. "You're here to play with me?" She asked, still hesitant and unsure.

Spitfire nodded quite slowly. "Yup. Figured I could use a break from the Wonderbolts. Rainbow Dash might be captain now, but I still stick around the academy in case she needs my help. And just because I'm not the captain anymore doesn't mean I'm not part of the team. I'll be a Wonderbolt 'til the day I die!" Upon seeing Twilight wince and recoil from her statement, she hastily corrected. "Sorry, sorry. Didn't mean to get so dramatic. Like I said, I'm not really good with kids. That's why Princess Celestia suggested I come here and play with you. She seems to think this'll help me get better."

"Indeed it will. The best way to learn how kids function is to get personal, hooves on experience," Princess Celestia encouraged. "Plus, you can still dip into your usual persona if you need to. Everypony loves a cool big sis."

Spitfire nodded again. "Yup. And from now on, you can just call me Spity. My mom used to call me that all the time when I was in diapers," Then she chuckled. "As a matter of fact, I kind of still am."

Twilight's mouth dropped open in shock! "What? You still wear diapers?!"

"Does that mean you're not potty trained?" Smarty Pants questioned.

The off-duty Wonderbolt giggled not unlike a school aged filly. "Never said that. I did graduate from diapers eventually. Had to to get into flight school," She began to move a hoof to the back of her flight suit. "But when you're up in the air or flying nonstop, sometimes you can't exactly fly off to look for a toilet. Luckily, I always come prepared." Soon, she had yanked off her flight suit, revealing a thick, white, poofy diaper was currently clad around her rump. In fact, it looked a fair bit used if the yellow tint and damp patches were any indication.

Now it was Twilight's turn to laugh. "Oh my goodness! You pee-peed yourself, Spity!"

If Spitfire was at all bothered by that obvious fact, she didn't show it outwardly. "Kind of had no choice. I didn't get a bathroom break before I flew over here. Had to come straight over from my last show, and that was a long one," She patted her diaper. "Luckily, I make sure to get the extra absorbent brands for the Wonderbolts. They're standard issue for long flights, performances, turbulence, and of course stunts. You never know what the g-forces might do to you. No need to pay for dry cleaning. You just let it all out and keep flying. Plenty of time to change afterward."

"Then I hope you won't protest if I change your diaper now, Spity," Celestia motherly cooed. "I can't have you playing with Twily in such a soggy thing. What if you got a rash? That wouldn't be any fun at all."

The padded pegasus nodded. "Yeah, guess it's time for a change. I'm pretty good at it myself, I'm the best diaper changer for all the Wonderbolts."

But the sun princess lifted Spitfire up with her magic. "Ah ah, Spity. Foals can't change themselves, you know. If you're going to play with Twily, you have to get into a foal's mindset the way Twily does."

Twilight nodded while giggling. "Yeah. You just relax and go with the flow. It's so much fun, especially when you have a loving mommy like I do."

Spitfire shrugged, surrendering herself to the inevitable. "Eh, guess I have no choice. Been a long time since I've had somepony change me. Eventually, you get used to doing it on your own. May not be the most fun or efficient thing ever, but it gets the job done."

It didn't take Princess Celestia long at all to remove Spitfire's old, soggy diaper and ball it up for disposal. It took only slightly longer for her to wipe and powder the pegasus, before strapping her up in a new diaper. "Since you're playing with Twily, you can borrow some of her diapers. There should be plenty for both of you." She motherly cooed, before levitating the padded pegasus pony off the changing table.

Spitfire took a moment to take in the scent of a freshly changed diaper and how it felt. "Gotta say, there's something so... relaxing about having your diaper changed for you."

"Uh-huh. And Mommy doesn't care if you're wet or messy!" Twilight proclaimed. "Mommy's there to clean you up and make you feel better, like all mommies do."

Celestia smiled and beamed with pride. "Oh, Twily, it warms my heart to know you think so highly of me. You're the best little foal I could've asked for."

Spitfire, meanwhile, plopped onto her padded rump. She delighted in the faint wisps of foal powder that billowed out from the leg holes, and the infantile scent of cornstarch that tickled her nostril as a result. For a moment, she was content to just sit there and be lost in her thoughts. But after the moment passed, she looked to her fellow padded pony and asked her. "So, what do you wanna do, pr... er, Twily?" She blinked slowly. "That's gonna take some getting used to."

Twilight giggled. "It's okay, Spity. I'm sure you'll get the hang of it eventually. Just do what I do," Then she put a hoof to her chin. "But actually, I don't really know what I wanna do today."

Princess Celestia then proposed. "Well, why don't I make a suggestion? After all, I got the day off so I could spend it with you, Twily. I don't want anything to get in the way of our playtime. And I most certainly couldn't take you to court with me. What would all the nobles think?"

Twilight stuck out her tongue in playful fashion. "They're just a bunch of big poopie heads. They don't like to have any fun at all! They're not like you, Mommy."

The sun princess seemed to struggle to suppress a smirk. "Even so, I don't think you'd want them all to know your secret, Twily. Better if we keep it to ourselves and to your playmates," She then suggested. "Now, why don't we all do something fun together? We can all play train: You, Spity, myself, and even Smarty Pants if she wants to join in."

The padded alicorn excitedly puffed out her wings! "Oh yes! Choo-choo train is fun! Let's play that!"

Spitfire pondered for a moment, then said. "Train sounds fine to me. I do like a little bit of pretend every now and then."

"How 'bout you, Smarty Pants?" Twilight asked the doll. "Do you wanna play too?"

Smarty Pants was quick to reply. "Oh, you know I do, Twily! I always want to play with you and have fun with you no matter what!"

"Splendid!" Princess Celestia clapped her hooves in approval. "Now let's all form a line and get our choo-choo train rolling," Then she suggested. "Spity, why don't you lead? You can be the engine that pulls the rest of the train behind it."

Spitfire was taken aback by the suggestion. "Me? Are you sure that's a good idea, Princess? I'm only just getting used to the idea of being a big foal."

Twilight happily encouraged. "I know you'll do a great job, Spity! Just close your eyes and pretend to be a choo-choo train. Mommy, Smarty Pants and I will follow you." She proceeded to stand directly behind Princess Celestia, and placed Smarty Pants atop her head so that the doll would be just slightly ahead of the padded alicorn.

The padded pegasus, however, just stood there in silence. She was hesitant to say or do anything. This was very much uncharted territory for her. What if she didn't do it right?

"Come on, Spity!" Twilight cheerfully called. "The train's ready to leave!" And she pretended to blow a whistle. "Choo choo!"

"Choo choo!" Celestia chimed in, mimicking Twilight's call.

Shutting her eyes and taking a deep breath, Spitfire tried to let go. She tried to picture herself not as a fearless Wonderbolt, but as a train on a railroad track, as the very locomotive at the front that pulled everything else behind it. In a way, it was not unlike her aerial performances with the Wonderbolts. The only difference is that this was for a private audience, which consisted entirely of the ponies behind her.

Steadying herself, the pegasus pony with a gold coat took a few steps forward. She was used to the extra weight of a diaper, though always when its crinkles were muffled beneath her flight suit. She quickly began shouting to drown out the infantile sound. "Choo choo!" She said in the most childish voice she could muster up (which didn't sound very convincing in her mind).

"Choo choo!" Celestia replied as she followed behind Spitfire as the ponies began parading around the room.

"Choo choo!" Smarty Pants and Twilight joined in, repeating the phrase every minute or so.

Of course, just saying "Choo choo" over and over again got tiring very quickly to Spitfire. So she tried to mix it up a bit by saying. "Chugga chugga."

Pretty soon, an alternating chorus of "Chugga chugga" and "Choo choo" could be heard echoing throughout the royal suite as Spitfire continued to lead the make believe train. Slowly but surely, as time passed, she found herself slipping more easily into her role. It felt so... liberating to be freed from all of her big pony worries, to just push them all aside and let herself go. She didn't even need to worry about needing the bathroom: She had a perfectly portable potty on her plot that could easily hold anything she might have to do if the need arose.

"This must be what ponies like Princess Twilight long to feel like," The padded pegasus thought to herself even as she continued her session of make believe with the princesses. "Could there be others like her out there somewhere?" Then she gasped as a realization struck her! "Of course! This must be why Princess Celestia had me hoof the reins of captain over to Rainbow Dash. Rainbow Dash must've found out about this too," A faint smirk formed on her face. "Oh, I am so gonna enjoy teasing her about this the next time I see her!"

Eventually, amidst the alternating chants of "Chugga chugga" and "Choo choo", the faintest of rumblings could be heard. It was coming from Spitfire's stomach, which caused the padded pegasus pony to slow right down to a standstill.

"What's the matter, Spity?" Twilight asked as she poked her head out from behind Princess Celestia. "Are you feeling okay?"

Spitfire slowly replied. "Uh, now that I think about it, it's been quite a long time since I had anything to eat. I usually don't like to eat big meals before a show. It's kind of related to how I got my embarrassing nickname, and why I started making all the Wonderbolts wear diapers for long shows," Her face blushed bright red. "Could've been worse, could've had it happen while my mom was in the crowd. Oh, I don't know if I'd ever live it down if she had seen that."

Smarty Pants chuckled. "Oh goodness, that must've been quite a mess: Just like the time Twily got into some chocolate pudding."

"Smarty Pants!" Twilight playfully whined. "You don't have to always tell everypony embarrassing stories about me! How would you like it if I told everypony embarrassing stories about you?"

"Gee, I'm sorry, Twily," Smarty Pants sincerely apologized. "I just get carried away sometimes. You're still my best friend, you know."

"Yes, I know," Twilight nodded, right before her own stomach started to grumble. "But now I'm hungry too."

"Well then, I guess that means it's time for lunch, my little ponies," Celestia cooed. "Delicious num-nums will get you fueled up for more playtime together," Then she trotted towards Spitfire. "But first, I believe diaper checks are in order."

Spitfire eeped as her padding was pulled back by the sun princess. "Why are you doing this? I'm pretty sure I'd know if I did anything in my diaper."

"Foals don't always know when they have to go or if they've done anything," The sun princess explained with a wink. "But you're dry, Spity. So just give me a moment to check on Twily, and then we'll get you both fed, okay?"

"Okay." Spitfire slowly nodded and sat down, waiting patiently.

Twilight proudly presented her padded posture to the elder alicorn as she approached, and didn't flinch when it was pulled back for a closer inspection.

"Seems you're a little bit wet, Twily," Princess Celestia commented. "We should get you changed. Unless, you'd like to try to use the potty again."

The padded alicorn shook her head from side to side. "Nah. I'm good, Mommy."

"Okay then," The sun princess agreed while using her magic to lift Twilight into the air. "Let's get you changed before you get a rash." And quick as a flash, she levitated her fellow alicorn over to the changing table and performed a diaper change.

Once Twilight was in a fresh, powdered diaper, she and Spitfire waddled after Princess Celestia as she ushered them to either side of her.

"Stay close to me, my little ponies," Celestia instructed, before lighting up her horn. She proceeded to teleport herself and the two padded ponies in her care to the royal dining room, which was currently unoccupied. "Okay. Everypony get comfortable, and I'll see what delicious num-nums are on the menu for today." She levitated over two bibs, tying them around the necks of both Twilight and Spitfire, then disappeared into the kitchen at the other end of the room.

Spitfire sat across from Twilight at the dining room table, which gave her an uninterrupted view of the padded princess poking at her padding with a hoof. Twilight clearly delighted in such a foalish act. Meanwhile, Spitfire was adjusting to the fact that her rear seemed to be sinking further into the padding. Her own diapers had always been thick and absorbent, but Twilight's diapers seemed to be even thicker (and probably even more absorbent). "Where does Princess Celestia... I mean your mommy get your diapers from, Twily?" Spitfire saw fit to ask at last.

The padded alicorn chuckled, not even looking up from where her hooves were. "I don't know. She must get them from somewhere special, though." And she went back to poking at her padding, making it crinkle and compress.

The off-duty Wonderbolt couldn't help but wonder what was so enjoyable about that. It didn't seem like it was anything worth taking pleasure in. Fortunately, her thoughts were soon distracted when Princess Celestia returned. Held within the glow of the sun princess' horn were several jars of different flavored foal foods, and plastic spoons. "Lunch is served, my little ponies!" She declared with a coo.

Spitfire watched with hesitation as the lids of the jars were unscrewed and removed, and the plastic spoons were dipped into the various colored goops. They didn't look appetizing at all. She usually wasn't picky about what she ate, so long as she wasn't eating right before or just after a show or a long flight (her stomach needed time to adjust). But this looked like it would be the rare exception.

Twilight seemed to harbor no such beliefs about the foal food. When spoons with the various foal foods were presented to her, she happily opened her mouth and let her fellow alicorn deposit the spoon's contents onto her mouth. Then, much to the padded pegasus' surprise, she watched as Twilight latched onto one of Celestia's exposed teats and began to suckle on it.

Princess Celestia's response was even more shocking than the act of Twilight nursing from her teats. She just drapped a wing over herself so as to give Twilight some privacy, until finally the padded alicorn decided she'd had enough breast milk and let go of the teat. Then she allowed herself to be burped by the sun princess, letting out a belch that would've made a dragon blush.

Spitfire knew what was coming next, and she squirmed about in her seat as she tried to get away. "Can't I have something else, please?" She pleaded with the taller, older alicorn.

Celestia simply replied in a motherly tone of voice. "Now Spity, you have to eat your num-nums if you want to grow up big and strong. This is all you're getting today, and I expect you to eat every last drop."

"But... but..." Spitfire stuttered.

"-Ah ah, no buts." Celestia motherly scolded, then presented one of the plastic spoons to Spitfire.

Hesitantly, the off-duty Wonderbolt opened her mouth and shut her eyes. She expected to gag on the foul taste, but was surprised instead by how sweet and delicious the deposited foal food tasted. It easily put Rainbow Dash's academy cooking to shame (not that that was saying much given how poorly Rainbow's first attempt had gone).

Princess Celestia smiled. "See? There's no need to make a fuss, Spity. It's good for you."

The padded pegasus didn't protest any further as the rest of the foal food was fed to her. The only thing that would make it better was if she had something to wash it down with. Imagine her surprise when she saw Celestia standing before her with an exposed teat.

"Go on, drink up." The sun princess encouraged.

"You sure you want me to, princess?" Spitfire asked as her face flushed red.

Celestia nodded. "Just don't drink too fast. You needn't worry, I have lactating pills so I can always have milk for when it's needed."

So Spitfire latched onto the teat and slowly suckled. She was almost overwhelmed by the warm, rich, creamy taste that soon reached her tongue! She only vaguely recalled the times her own mother had breastfeed her as a foal. Oh how long ago those memories appeared to be now. How long had it been? Two decades? Maybe three? At the time, Spitfire felt she had grown up at a fairly reasonable age. But now she was beginning to think that maybe she hadn't fully enjoyed her foalhood as much as she should've. To say nothing of how little time she'd spent with her mother as of late.

A faint yet steady hissing sound snapped the padded pegasus out of her pondering. She looked down at her diaper to see it fast swelling up as her bladder emptied itself. That breast milk had gone right through her!

"Oh, goodness!" Princess Celestia chuckled. "Twily does that too, sometimes."

"I do not!" Twilight playfully whined anew.

Spitfire, meanwhile, just sheepishly replied. "Sorry, princess. I didn't mean to do that."

The sun princess waved a hoof. "Oh, it's quite alright. That's why you're wearing a diaper," She then offered. "Would you like a change before we resume your playtime with Twily?"

The off-duty Wonderbolt looked down at her diaper, seeing the wet spots slowly fading as the padding soaked up her accident like a sponge. The damp feeling also wasn't that bad, at least for right now. So she said with a tone of indifference. "Nah, I'm good. These diapers look like they can hold a lot more than that!"

"Oh they most certainly can. I'm so jealous of the fact that you and Twily get to wear those diapers and I don't." Smarty Pants commented.

"Hey, if you like 'em so much, why don't you put one on, Smarty Pants?" Spitfire proposed. "I'm sure they could fit you with a little bit of adjusting."

Princess Celestia smiled. "I think that's a great idea, Spity. When we get back to Twily's room, I'll see about modifying one of Twily's diapers and putting it on Smarty Pants. Then you can all play together."

Sure enough, when Celestia brought Twilight, Spitfire and Smarty Pants back to the royal suite, she immediately used her magic to grab one of the thick diapers from Twilight's stash. Focusing her horn on the padded undergarment, she soon had it shrunk down until it was small enough for Twilight to slip it onto Smarty Pants.

Smarty Pants cheered! "Yay! I actually get to wear diapers instead of having them made for me! Thank you, Spity!"

Twilight beamed with delight. "Yes, thanks a bunch, Spity. You're the best, really!"

Spitfire waved a hoof, shrugging off the compliment. "Eh, it's no biggie. I just figured Mommy could do something nice for you too."

"Still, I can't thank you enough for your idea!" Smarty Pants happily proclaimed as she hugged Spitfire. "I think you're the best playmate for Twily in a long time. And I'm not just saying that because you helped get me into diapers."

"Well, don't thank me yet," The off-duty Wonderbolt replied. "Because now I wanna play something much more fun than choo-choo train, and that was a lot of fun."

"Really? What is it?" Smarty Pants asked the padded pegasus.

With a grin, Spitfire playfully lunged at Twilight and proclaimed. "Diaper wrestling, of course! First pony to pin the other underneath their padded rump wins. Trust me, this is the best!"

"You're on, Spity!" Twilight playfully replied as she began to tussle with her fellow padded pony. "I'm not gonna lose to you!"

The padded pegasus giggled as she rolled around, trying to avoid Twilight's efforts to roll her over and sit on top of her. "You can't beat me at diaper wrestling! You can't beat me at anything, period! I never lose! Now come on! Show me whatcha got!"

The two padded ponies thus tumbled and rolled about, paying little attention to anything else as they both tried to overtake the other and plop their padded plot firmly onto their opponent.

Princess Celestia initially watched the play fight with a motherly smile. But when she saw the two padded ponies drawing near to the princess sized bed, she immediately began to worry and gasped! "Look out!" She rushed forward, hoping to stop the fight before it was too late.

Alas, Spitfire made one swift motion and thrust herself hard at the padded princess. "I've got you now!" She boasted.

The resulting motion from the padded pegasus propelled Twilight backward. With an audible thump, her backside struck the foot of the bed. Immediately, the fighting stopped as Twilight sat up and began to whimper.

The off-duty Wonderbolt was immediately racked with guilt over what her actions had just caused. "Oh geez! I'm so sorry, Twily! Are you okay?! Are you bleeding? Did you break something?" And she began frantically trying to look the alicorn all over for any sign of injury.

However, Celestia ended up taking charge of the situation, lifting Twilight up with her magic and pulling her close for inspection. "It's okay, Twily," She reassured her fellow alicorn with that motherly tone of hers. "Mommy's here."

"Mommy, I got a boo-boo!" Twilight sniffled and sobbed. Sure enough, it was possible to notice a faint bruise mark on her back where it had impacted the bed.

The sun princess gently shushed Twilight, gently calming her down. "There there, Twily. I'll put a bandage on it. Then you'll feel better."

"I'll go get it!" Spitfire insisted, desperate to do something to make up for unintentionally causing her playmate to be injured.

But Princess Celestia took care of the problem before Spitfire could do much of anything. A smiley faced bandage a bright pink in color was soon levitated over the bruise, covering it completely. Then, carefully, Celestia set Twilight back down.

"I'm really sorry about that, Mommy," The off-duty Wonderbolt sincerely apologized, before turning her attention to Twily. "I didn't mean to play so rough with you, Twily. I forgot that whenever I did stuff like that as a foal, it was always outside. My mom would make me do it there so I wouldn't break anything or get hurt. And if I ever did get hurt, she would always be there to kiss my boo-boos and make me feel better."

"Sounds like your mommy was just as sweet as Twily's mommy is." Smarty Pants commented.

Spitfire nodded quite slowly. "Yeah, she was," A lone tear came into her eyes. "I really haven't seen her in so long. Things have been so busy with the Wonderbolts these past few years. It feels like I barely ever have time for myself anymore. This was my first day off in I don't even know how long."

Twilight slowly waddled over, nuzzling her fellow padded pony in the side. "Well, I'm sure you can find time to see your mommy now that you're no longer captain," Then she declared. "But maybe I should pick the next game we play. A game where nopony has to get hurt."

The rest of the day was a fun filled blur for Spitfire, as she passed the time playing all sorts of fun games with Twilight (including a game of house in which Spitfire was the unlucky pony to be saddled with the role of "Baby", resulting in far too many diaper changes that she was on the receiving end of). She wasn't sure this had fully cured her trouble with children, but the off-duty Wonderbolt was nevertheless convinced it was a step in the right direction at the very least.

When at last the playtime came to an end, Spitfire grabbed her flight suit and hastily put it back on. As she did so, she thought something was off from the way it felt. She quickly dismissed it, she could worry about that at a later time.

So exhausted was the pegasus pony that she only barely made it back to her own royal suite that she was staying in, falling asleep almost as soon as she had crawled into bed.

Next morning, when the off-duty Wonderbolt woke up, the first thing she noticed was a letter sitting on a stand near her bed. She sat up to get a closer look and read it, and as she did so she thought she felt something squish underneath her. But she could worry about that later, the letter seemed important. It was short and read as follows:

Dear Spitfire,

I don't want you to think you're in any trouble for what happened with Twily yesterday. She's fine, and I know you didn't mean to cause her to get hurt. Hopefully, the incident has taught you to be more delicate with foals, either others or your own if you ever have any.

That aside, you were a great playmate for Twily. I know she appreciated having somepony exactly on her level that could play with her. And Smarty Pants told me to tell you thanks for your idea about putting her in diapers, she really enjoyed it and is already looking forward to doing it again.

For somepony who told me she wasn't all that good with kids, you seemed to do a good job interacting with Twily. As a way of thanking you for what you did, I arranged a little something that I'm sure you'll appreciate.

Yours truly,

Princess Celestia

Spitfire had no sooner finished reading the letter when the door to her suite swung open. In strolled her mother, Stormy Flare. And was it Spitfire's imagination, or did her mother's eyes seem to be drawn to something?

Stormy Flare seemed to have a motherly smile on her face as she approached the bed her daughter was in, pulling back the sheets to be greeted with the sight of a very wet diaper. "My goodness, Spitfire!" She seemed to tease. "I thought you were potty trained."

At that the off-duty Wonderbolt gasped! Only now did it dawn on her that she hadn't changed out of her diaper last night, let alone used the bathroom. "M-mother," She whimpered in shame. "I...it's... not what you think. I just..."

Stormy Flare only made a tsking motion with one of her hooves. "It's a good thing Princess Celestia brought me here today. She said she had just the thing to make me feel young again. And this certainly makes me feel young. Why, I haven't changed your diaper since you were four."

"Mom!" Spitfire whined as the shame washed over her.

Dusty (Lightning Dust)

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Author's Notes:

Scootabom1 proposed the idea of Lightning Dust mentally regressing after accidentally breaking into the castle due to messing up a stunt. And Tiber Septim II proposed the idea of Twilight suffering a nightmare, alerting Celestia as a result. I did also throw in a slight reference to Lightning Dust's prompt in "Potty Training Tales".

If you're curious as to what that punishment for Lightning Dust is, check out Tale #2 in this fanfic.

Remember, characters previously voted on will get half a vote, and any characters not mentioned before will get a full vote. As always, feel free to suggest not only who you'd want to see as a playmate, but also what Twily could do with them.

Characters that can only be done in group pairings:
Mane six
Spike
Princess Cadence
Shining Armor
Princess Luna
Octavia and Vinyl Scratch
Twilight Velvet
Spitfire (with or without Wonderbolts)
Lightning Dust

Characters previously voted on:
Moondancer - One vote
Cheerilee - One vote
Maud Pie - One vote

"Do you really have to go away, Mommy?" Twilight asked as she looked up at Princess Celestia whilst the elder alicorn was tucking the younger one into bed, the crinkling of Twilight's diaper mixing with the light rustling of the sheets.

Celestia nodded, but gently and motherly reassured Twilight. "It'll only be for an hour or two at most, I promise. As much as I love spending time with you and taking care of you, I still have my responsibilities and royal duties. If I put them off for too long, ponies would start to become suspicious."

"Can't I go with you, Mommy?" Twilight asked as she shot a pair of pleading, puppy dog eyes at Celestia. "I'll behave, I promise."

The sun princess smiled even as she shook her head from side to side. "And let all those nobles and delegates see you in diapers? I think not. The bond we have with each other is special. But something tells me that some ponies might not see it that way. Besides," She added with a smirk. "You're not potty trained yet, and I don't think you will be any time soon."

The young, padded alicorn blushed as she realized the obvious. "Oh yeah."

Smarty Pants just giggled. "It's okay, Twily. Whether you stay in diapers or not, you'll always have me. Nopony can ever separate us again."

Twilight clutched the stuffed donkey tightly for comfort. "You're right, Smarty Pants. As long as we're together, we can do anything!"

Princess Celestia let out a faint aw in spite of herself. She truly found it adorable when Twilight was in her little mindset. If only she could find a way to convincingly transfer her duties to someone else, then she'd have all the time in the world to take care of little Twily. Alas, royal duties were royal duties, and they couldn't be put off any longer. "Don't worry, Twily," She reassured her fellow alicorn. "I've set up a baby monitor so that if you need anything, I'll know. I've enchanted it so that only I will hear your voice, everypony else will just think it's a random foal. Now be a good little pony and take a nap for me, okay?"

"Okay, Mommy." Twilight yawned and slowly but surely shut her eyes, still holding onto Smarty Pants in the process.

The sun princess waited until she was certain Twilight was fast asleep, then slowly and quietly left the suite Twilight was staying in and headed for the throne room. With any luck, time would fly by quickly and she would be able to return to caring for Twilight before the younger alicorn awakened.

Celestia did her best to keep her mind from wandering while she was holding court. But even as she tried her best to pay attention, her thoughts kept drifting back to little Twily. She still remembered Luna's warning about not getting too attached, how it might adversely impact Twilight's mental state if former teacher and student couldn't separate from their roles. Despite this, the sun princess found that she had gotten quite used to being a mother to her new little one. What was so wrong with that when Twilight clearly wanted to be treated like a foal, and enjoyed being cared for?

Princess Celestia was only snapped out of her pondering and contemplation by a very familiar sound. Amidst a sudden silence in the throne room, it was possible to hear the sound of crying on an old, worn out baby monitor. And she knew at once who the crying was coming from! "Twily!" She whispered and stood up, all eyes suddenly falling upon her.

"Is something the matter, princess?" A delegate asked.

The sun princess nodded. "Yes there is," She was quick to apologize. "There's a foal in the castle who I'm trying to find the parents of. But until I do, I'm caring for it myself. And it sounds like the little one needs me now. I have to make sure it's okay."

The delegates, suspecting nothing, all nodded and gave their approval. The delegate from before even said. "Perfectly understandable, princess. We will wait until you've calmed the little one down."

"Thank you, everypony." Celestia bowed, then lit up her horn and teleported away. She soon arrived back in the royal suite where Twilight was staying, and found the padded alicorn tossing and turning in bed.

"Mommy! Mommy!" Twilight whimpered with her eyes shut, her sobs reaching audible levels.

Princess Celestia immediately rushed to the bedside, placing a hoof on the padded alicorn. "Twily?! Twily! It's okay, Mommy's here for you," She spoke in that warm and gentle tone of hers. "You're just having a nightmare. It's not real."

Slowly but surely, Twilight seemed to calm down as she opened her eyes. But then she immediately buried her face in Princess Celestia's chest, and sobbed and sniffled. "Mommy, it was horrible! We were going to see my friends in Ponyville for a playdate. And then, we got separated, and I couldn't find you anywhere, and... and..." She trailed off, unable to bring herself to say anything more.

The sun princess merely draped a wing over her fellow alicorn, pulling her close for a big hug. "It's okay, Twily. It's okay. I'm right here. I won't leave you ever, I promise." She stood there at the side of the bed, waiting for Twilight's cries and sobs to slowly cease.

When the crying finally stopped, Twilight slowly lifted her head. Her eyes were stained red from the crying. "Mommy." She said slowly.

"Yes, Twily?" Princess Celestia asked.

Twilight slowly looked down at her diaper, whimpering slightly. "I think I had an accident. I didn't mean to."

Although inclined to take Twilight at her word, Celestia nevertheless opted to do a quick diaper check just to be sure. The diaper had indeed been used, though it was hard to tell just by looking at it. Touching it, however, gave off a slightly damp feeling. Celestia cooed. "Oh, you're just a little wet, Twily. That's all. I think we can wait a little while before changing you. Your diapers can hold a lot more, you know. I don't think you'll get a rash just yet."

"Are you sure, Mommy?" The padded alicorn asked.

Princess Celestia firmly nodded. "Of course I'm sure, Twily. Now, why don't we play a little bit together, and then I'll change your diaper before setting you down for another nap."

Just then, however, the two alicorns heard a thundering crash and a loud boom that shook the ground!

"What was that?!" Twilight gasped and shivered in fright.

Celestia stood up, immediately throwing her wings over Twilight as she declared. "I don't know, Twily. But I'm going to find out," She proceeded to instruct the padded alicorn. "Stay here. I'll be back as soon as I can."

"Please be careful, Mommy." The padded alicorn pleaded with the sun princess as she watched Celestia depart.

After leaving the royal suite, Princess Celestia quickly rushed to where she was certain the disturbance had originated from. She didn't know who or what it might be, but with her horn charged she was ready to confront any potential threat. No one and nothing was going to get between her and Twily!

Rounding a corner, the sun princess suddenly came upon a scene that made her gasp!

Shards of broken glass lay by a stained window that had clearly been broken and shattered, displaying a silhouette of a full grown pegasus pony (thus leaving no doubt as to what had broken the window in the first place). The royal guards, meanwhile, were struggling to hold onto a pony that was fighting back against them!

Celestia approached the scuffle just as a guard finally succeeded in pinning down the assailant. "What is going on here?!" The sun princess sternly demanded as her eyes narrowed.

The guards stood up, firing off a quick salute before one stated. "Your majesty, we have just apprehended this would-be attacker that broke into the palace. From the looks of it, she was attempting a stunt of some kind that clearly backfired. She tried to run away from us, and then she tried to fight us. What shall we do with her?"

"Let me go!" A high pitched but raspy voice cried out! "You big meanies! No play nice!" The voice's owner then revealed itself in the form of a pegasus mare who looked almost completely identical to Rainbow Dash giving the mane style. Unlike Rainbow Dash, though, this pegasus mare had a turquoise green coat, a brilliant amber mane and tail with gold stripes throughout, and eyes the same color of orange as the sky at sunset. Her cutie mark was a white lightning bolt with three stars (two orange and one yellow).

Princess Celestia recognized the pegasus pony at once. "So you're Lightning Dust!" She exclaimed. "I heard about you from Rainbow Dash and Spitfire. Apparently, you are quite a troublemaker. And quite reckless too."

Lightning Dust stuck out her tongue, blowing a raspberry at the princess. "Me no like you! You big meanie too!" She declared, not appearing to recognize who she was talking to.

A royal guard quickly explained. "It seems like she hit her head at some point. We're not sure if this'll wear off eventually or not," Then he blushed. "And... there is another problem." He pointed a hoof to a small, yellow colored puddle that was just now forming underneath the pegasus mare.

"Oopsie!" Lightning declared as she crossed her legs. "Me go potty."

Celestia had to resist the urge to snicker at Lightning Dust's juvenile and foalish behavior. Right now, the pegasus pony was acting a lot like Twilight. Except this was no act, it seemed that the blow to the head had somehow caused Lightning to revert back to the mentality of a little foal. And that gave her an idea. "Guards." She sharply declared.

The royal guards stood at attention. "Yes, your majesty?" They all asked in unison.

"Please inform the delegates that I will not be returning to court today. If they ask, inform them that I'm taking care of a troublemaker who broke into our castle by accident, and that I'm not to be disturbed while I carry out the punishment," The sun princess instructed to the guards. Then, in a slightly embarrassed tone she added. "And uh, get somepony to clean up Lightning Dust's... accident."

"Understood, your majesty." The guards all saluted, and then raced away to carry out her orders.

That left Princess Celestia alone with the mentally regressed Lightning Dust. That motherly smile of hers returned as she declared to her would-be attacker. "I think we need to get you some 'protection' in case you have any more accidents. And luckily for you, I know where we can find the sort of 'protection' you need." She then used her magic to pick up the pegasus pony and carry her away.

Twilight was most surprised when Princess Celestia returned to the royal suite with Lightning Dust in tow, the pegasus pony drooling and sucking on one of her hooves. "Mommy, who is that?" She asked the sun princess.

Princess Celestia carefully floated Lightning Dust through the air, all the while using her magic to pull out one of the diapers normally intended for Twilight. "This is your next playmate, Twily. Lightning Dust, or Dusty as I'm going to be calling her. Let's just say she's been a very naughty pony, and this is going to be her punishment."

"Are you going to spank her?" Twilight asked, shuddering at the memory of the one time Celestia had done that to her as a result of bad behavior.

"Not unless she gives me a very good reason to," The sun princess explained as she slipped the diaper onto Lightning's rump and taped it up. "For right now, I'm hoping that she won't be too naughty. Maybe you can help her in that regard."

Twilight's wings unfolded as she happily exclaimed! "Oh boy, I get to be the big sissy! Isn't that great, Smarty Pants?"

Smarty Pants happily replied. "I'm so proud of you, Twily. You're growing up so fast."

Celestia smiled as she floated the now padded pegasus pony down. "Well then, I'll let you and Dusty get to know each other. Then I'll change your diaper, Twily, so you don't get a rash."

The padded alicorn watched as Lightning Dust took a moment to get used to her new padding. Lightning Dust clumsily waddled along, only for one of her hooves to give away and cause her to fall. Lightning landed promptly on her padded posture, producing an audible crinkle and a thud. "Me go boom boom!" Lightning declared, not sounding the least bit embarrassed about what she'd just done.

Twilight giggled, proceeding to intentionally do what Lightning Dust had just done by accident. "Me go boom boom too, Dusty!" She then stuck out a hoof. "I Twily, by the way. Nice to meet ya."

"Nice to meet ya, Twily," Lightning replied as she freed one of her hooves from her mouth and offered it to Twilight, shaking it firmly. "I Lightning, but me get called Dusty by everypony. So now me am Dusty," Looking at the alicorn, she exclaimed. "Ya so big!"

The padded alicorn proudly proclaimed. "That 'cause I an alicorn: Me have pegasus wings and unicorn horn, just like Mommy." She pointed to Princess Celestia.

"The princess ya mommy?" Lightning blinked in surprise and apparent confusion.

Twilight Sparkle nodded. "Uh-uh, and now she your mommy too. We get to be sissies!" Then she held up Smarty Pants and said. "And this Smarty Pants. She my friend. Say hi to Dusty, Smarty Pants."

"Hello, Dusty," Smarty Pants greeted in an exaggerated tone of voice. "I see you got to meet Twily. She's super nice, and so's her mommy. She keeps bringing over ponies for Twily to play with, and sometimes she joins in the fun."

The padded pegasus replied by grabbing hold of Smarty Pants, trying to snatch it out of Twilight's hooves.

Twilight grabbed Smarty Pants from the other end, refusing to let go! "Mine! You can't have Smarty Pants!"

"Me wanna play with Smarty Pants!" Lightning Dust insisted with a growl!

"But she mine!" Twilight protested.

Princess Celestia immediately intervened to break up the fight before it could escalate. "That's enough, both of you!" She scolded. "If you can't behave, I'll put you both in time out and take Smarty Pants away," To Lightning Dust she then instructed. "Dusty, we say 'please' when we want to have something that belongs to somepony else."

Lightning proceeded to ask Twilight. "Can me please have Smarty Pants to play with? Me not gonna hurt her. Me promise."

Reluctantly, Twilight let go of the doll and let Lightning Dust take hold of her. "Please be careful with her." She pleaded.

"Don't worry, Twily," Smarty Pants sought to reassure the padded alicorn. "You know I put up with a lot under you, not to mention when I was Winona's favorite chew toy. I'll be okay, I promise."

Lightning Dust, meanwhile, lifted Smarty Pants into the air and made loud noises as she proclaimed. "Me gonna fly just like the Wonderbolts! Me wanna fly like Spitfire!" And she held the doll aloft, swinging it around in circles for a while.

Celestia decided to take advantage of the opportunity, taking Twilight by the hoof and leading her away to get changed. "Now's an excellent time to take care of your wet diaper, Twily. We certainly wouldn't want a rash to spoil your fun with Dusty."

As Twilight was having her old diaper be removed, and her rump wiped clean, she looked up at the sun princess and asked her. "Are you gonna make me use the potty, Mommy?"

"Not unless you want to, Twily," The sun princess cooed as she bailed up the old diaper and the wipes, and threw them away in the trash. "I don't want to force you to do something you'd rather not do. We both agreed that you only need to try to use it once a week at most."

"Okay, Mommy," The padded alicorn nodded. "I'll think about it. But you'll love me no matter what I do, right?" The last line sounded just the tiniest bit uncertain.

Princess Celestia was quick to reassure her fellow alicorn. "Of course I will, Twily. Don't ever doubt that. Mommy will always love you and always be there for you no matter what. I will never let anything bad happen to you."

Twilight slowly sat up after a new diaper was fastened to her rump, happily hugging Princess Celestia tightly. "Thank you, Mommy! You're the best mommy ever!"

Celestia smiled as she returned the hug full force. "No, thank you, Twily. Thank you for letting me be your mommy. You've always been family to me. And this lets me make it official."

A short time after returning from being changed, Twilight was most surprised (but also greatly relieved) to receive Smarty Pants back from Lightning. The padded pegasus told the padded alicorn. "Me all done playing with Smarty Pants. You can have her back. Smarty Pants lots of fun, but she no talk to me."

Twilight giggled as she took hold of the doll once again. "That's because I usually do the talking for her."

"What are you talking about, Twily?" Smarty Pants retorted. "You know I can talk by myself if I want to. And I can do other things too: Like sing. Remember, you used to be unable to tinkle a drop unless I was singing to you while you were on the potty."

The padded alicorn's blush deepened. "Smarty Pants, you don't have to keep bringing that up all the time. Besides, you know I don't need that anymore. You've seen me go potty without you singing at all: I've pee-peed and poo-pooed in it without any singing at all."

But Lightning Dust, instead of laughing, seemed to whimper and shrink back. "No like the potty. Potty almost eat me. It not nice at all."

"Well, I don't really care for the potty either to be honest," Twilight declared. "I only really use it because my mommy wants me to use it sometimes. But she already says she'll love me no matter what. So I don't really try to use the potty unless I really have to. I like diapers better."

Lightning nodded. "Uh-huh, diapers safer. Diapers more comfy." She patted her padded rump to prove the point.

Twilight giggled, mimicking Lightning's gesture. "That's right. And Mommy always gets the biggest, poofiest diapers. That's why she's the best mommy ever! She even lets me drink her milkies, they taste yummy!"

"And you know what else tastes yummy, my little ponies?" The sun princess asked as she got both padded ponies to turn and face her. When they did so, they saw her carrying out a tray full of fresh cut veggies. "Snacks. I made sure to get the best snacks possible."

"Cookies?!" Lightning exclaimed as she waddled over.

Celestia shook her head. "No cookies. At least, not unless you eat your veggies, Dusty. And the same goes for you, Twily. Too many cookies and nothing else are not good for you. And you want to grow up big and strong, right?"

Twilight nodded back, puffing out her chest. "Uh-huh. Wanna grow up to be like you, Mommy." She then waddled over slowly but surely.

Satisfied with the response from one of her charges, the sun princess carefully set the tray of veggies down on the floor. "Go ahead, eat up." She encouraged.

Lightning Dust sniffed the vegetables and stuck out her tongue. "Yucky! No wanna!"

"But Dusty," Twilight protested as she sat down near the tray. "You gotta eat your veggies if you want cookies. Veggies make you big and strong, like Mommy." She proceeded to grab some baby carrots, and happily chomped down on them.

Smarty Pants encouraged. "Even though I don't really eat, I can see how happy Twily is when she eats her veggies for her mommy. You should eat them too, Dusty. Veggies are good for you. They're not yucky at all."

Lightning was still very hesitant about approaching the tray, and even more hesitant to touch, let alone eat any of the cut up vegetables. She very nearly looked like she was going to gag when she helped herself to some celery. But she managed to force it down, and soon she was grabbing as many veggies as she could get her hooves on. In the process, crumbs flew everywhere!

That was in stark contrast to Twilight, who ate her snack slowly and carefully. At least, until a plate of freshly baked chocolate chip cookies were presented to the two padded ponies. The sweet scent of the cookies overrode any instinct both padded mares might have had to do anything other than shove the cookies into their mouths as fast as they could!

"My goodness!" Princess Celestia playfully exclaimed afterward as she very carefully used a rag to wipe the mouths of both her charges. "What messy foals I have," Then, she exposed her teats to them. "Well, you'll both want milk to wash down those cookies. Don't worry, there's plenty of milk for you both. Just try not to drink too fast."

Twilight happily latched onto one of Celestia's teats and began to suckle, soon being rewarded for her efforts as rich, creamy milk slowly trickled down her throat.

Lightning Dust somewhat clumsily latched onto the other exposed teat, and then tried to emulate Twilight's actions as best she could. "Mmm." She dreamily declared, shutting her eyes and concentrating on nothing but suckling.

After what felt like several minutes worth of breastfeeding, the sun princess carefully brushed both padded ponies away from her teats and concealed them again. "That's enough for now," She told them. "Now, you two wait here while I go and get some supplies. I know of a fun activity you can do together."

The activity was hoof-painting. Princess Celestia used her magic to carry over two art easels, several blank sheets of paper, smocks, and of course colorful paints. She also set several wads of old newspaper down around the easels, so as to make sure any traces of paint wouldn't end up on the floors. No need to make the hired hooves work even harder, especially not after some of them had undoubtedly been pressed into service cleaning up Lightning's earlier accident.

"Why don't you both paint me some pretty pictures?" Celestia encouraged both Twilight Sparkle and Lightning Dust. "Maybe if it's good enough, I'll even hang it up on a fridge." Then she stepped back, hoping that doing so would give the two the freedom they needed to come up with inspiration.

Twilight carefully set Smarty Pants down a ways away from the paints and the easels. "I don't want to risk getting paint on you, Smarty Pants. That would take forever to wash off. And I don't know what I'd do without you."

"That's okay, Twily," Smarty Pants replied. "I'm not much of an artist anyway. But I know whatever you paint is sure to be spectacular. I still remember your old hoof paintings for your other mommy. She never took them down from the fridge, not even after you left to study with our current mommy."

The padded alicorn giggled. "Oh, I know. She still kept B.B.B.F.F.'s hoof paintings up too. She kept almost everything from when we were foals, even our old potty chair." Then, she stared at her easel as she tried to think about what to paint and what colors to use.

Lightning Dust didn't bother to think about what she'd paint or what colors she'd use to do so. She just dipped her hooves into the various paints and splattered them all over the easel without rhyme or reason. "Pretty colors!" She giggled, all the while drips of paint began to fall off the easel and onto the newspaper below. She was quickly getting paint all over her fur, not that she cared.

Twilight, by contrast, tried to be careful. She tried not to let her colors run or mix, and she tried to make sure only her hooves were covered in paint. She didn't want to make a mess for her mommy. She'd been pretty well behaved all day so far, and she didn't want to ruin that streak now. It was the least she could do to thank her mommy for not forcing her to potty train, even though the padded alicorn knew it would make the sun princess really happy.

At last, both padded ponies completed their paintings. And Princess Celestia came trotting over to inspect them.

Twilight happily and proudly showed off her painting first. It was rather crude, all things considered, but that just added to the charm of it. "It's a picture of me and you, Mommy," She told the older alicorn, pointing to the purple and yellow sketches of ponies standing next to each other. "I made you yellow, just like the sun," She pointed a hoof to a small yellow circle above. "See? There's the sun you raise. And that you and me, we're holding hooves. We're outside, on the grass, enjoying the day," She pointed to lines of green underneath the ponies. "Do you like it?" She hopefully asked.

The alicorn with a majestic white coat nodded quite slowly, holding up the painting with her magic and admiring it. "Oh Twily, it's beautiful!" It was all she took to keep from tearing up. "I can't wait to put this on my fridge," Then she trotted over to Lightning Dust, asking the padded pegasus. "And what did you paint for me, Dusty?"

"Me just painted pretty colors," Lightning Dust replied, then blushing a bit. "But me made a mess. Painting fun, though."

Celestia smiled and suppressed a giggle. "Well, it's a nice painting, even if it's just a bunch of swirls and lines. I guess it can be hard to come up with inspiration sometimes," Her smile slowly faded as she observed just how much paint Lightning had managed to smear all over herself. "But just look at you! Now you're all messy, Dusty. You're going to need a bath."

"Nu-uh, no bath!" Lightning protested and unfolded her wings, looking ready to fly off at a moment's notice. However, instead of doing that, she spread her legs and shut her eyes as she grunted. Soon, her tail started to hike upward.

"Is she actually-" Princess Celestia began to think. But her question was soon answered as she could see Lightning Dust's diaper starting to bulge in back, all the while the familiar stench of methane began to permeate the entire room.

The padded pegasus grunted and kept pushing, her legs spreading apart further as the bulge in her diaper grew bigger and bigger by the second. At last, with an audible "Fwop", the tapes of her diaper were ripped off and it fell to the ground with a thud. She smiled, apparently quite pleased with her dirty deed as she declared. "Diaper off. All in, all out. Now you change me."

The sun princess sighed, then exclaimed in only slightly exaggerated fashion. "My goodness! Did my milk do that to you, Dusty?! Now you really do need a bath and another diaper," To Twilight she then added. "Now Twily, why don't you..."

But before anything else could be said, Twilight started pushing. And soon, her diaper had filled up as well. "I messy too, Mommy," She declared. "Me have to take a bath too now, right?"

Celestia nodded, she couldn't bring herself to be mad with Twilight. Yet in the back of her mind, she was thinking. "Twilight did that on purpose, I'm sure of it. She really is getting attached to me. But is that such a bad thing? It's all just part of the act, right?"

Well, those were thoughts for another time and place. For right now, the alicorn with a majestic white coat had two very stinky padded ponies in desperate need of changing and bathing. So she used her magic to pick both her charges up (as well as Lightning Dust's very dirty diaper) and carried them into the bathroom. After discarding Lightning Dust's decimated diaper in the trash, she turned on the tap and let the tub slowly fill up with warm water.

Lightning Dust woke up several hours later with her mind still in a bit of a daze. "Where am I?" She muttered to herself. The last thing she could remember, she had been working on a stunt intended to surpass even the fabled Sonic Rainboom, convinced that such a move would be just the thing to impress the Wonderbolts. She still heavily resented having been kicked out of them just because of one incident that hadn't even really been her fault.

But the stunt had gone horribly wrong. While trying to build up enough speed to shatter the sound barrier, Lightning Dust had lost control and had crashed head on through one of the stained glass windows in the castle. Everything after that until now was a blur, almost like she'd been having an out of body experience. The pegasus pony vaguely recalled being "punished" by Princess Celestia, and having momentarily lost control of her bodily functions. But aside from that, she couldn't remember a thing.

Then, suddenly, Lightning's eyes noticed something on a nearby table. Being quite curious, she naturally picked it up and examined it carefully.

What Lightning Dust read made her eyes widen in disbelief, and what she saw attached to the note she was now reading only made her boil over with rage. There were several pictures of her clearly wearing diapers, playing with none other than Princess Twilight, who was also padded for some reason.

The note read as follows:

Dear Lightning Dust,

I'm sure you must be wondering by now where you are and what happened to you. Well, you ended up quite literally crashing into my castle. And in the process, it seems that you temporarily reverted back to the mentality of a foal.

Don't worry, the only other pony besides myself who saw you in such an infantile state was Twily. And she's already been sworn to secrecy. She won't tell a soul. And I trust you to do the same.

If you agree to keep Twily's secret a secret from everypony, then these pictures of you being treated as a foal won't end in every paper and magazine across all of Equestria. I might even be willing to talk to the new captain of the Wonderbolts, and see about letting you have a second chance with the team. Of course, if that happens, you'll have to start over from the very bottom of the totem pole.

But should you blab to anypony at all, your name and face will be all over Equestria. And it won't be in the way you intended.

Choose wisely,

Princess Celestia

Lightning let out a guttural roar as she threw down the note and the pictures. "I can't believe she did this to me!" She growled. "And I can't believe she's actually going to blackmail me! Me!"

But then the pegasus pony sighed, realizing the dilemma she was in. She couldn't tell anypony, not unless she wanted to have those pictures of her in diapers be circulated throughout all of Equestria.

Besides, the extreme daredevil really wanted that second chance with the Wonderbolts. She would do anything to convince them to let her back into their ranks, or even just back into their tryouts at the academy. Hopefully, this new captain (whoever she was) would be forgiving and generous, not like Spitfire. Lightning Dust could still remember how Spitfire (along with Soarin) had punished Lightning for her apparent "recklessness": Quite literally sending her down the drain.

Maud (Maud Pie)

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Author's Notes:

Maud Pie won the tiebreaker, so she gets to be the character of focus here. I decided to base inspiration somewhat around Softer than the Rocks, which I did an unofficial sequel to last year. Of course, since that fics involves Maud's home in Ponyville, which she doesn't get until Season 7, and this is taking place in an AU around Season 6, I have to work around that.

I also drew on inspiration both from Pinkie Pie's chapter in the original story I'm continuing here, and on some headcanons involving toilets and potty training as discussed with Latecomer.

Characters previously voted on:
Moondancer - Two vots
Cheerilee - Two votes
Lyra (with Bon Bon) - One vote

Princess Celestia hummed a little tune to herself as she yet again made the trek across the castle to the private suite where Twilight was staying. She was already looking forward to another fun filled day spent in the role of "Mommy", with Twilight playing the oh so adorable role of "Twily". Despite the sun princess' growing concerns about how much of Twilight's behavior was just an act and how much of it was real, it wasn't enough to persuade her to stop or even slow down the treatment. Luna had yet to voice any more concerns to Celestia in spite of the nightmare just the other day, so all was okay.

As a matter of fact, things were more than okay. Princess Celestia had already reached out to somepony about being Twily's next playmate. This one had come at the suggestion of Pinkie Pie, who said this pony was "really good with foals" and would make for "an awesome big sister". So the alicorn with a majestic white coat had reached out to the pony Pinkie had suggested, and this pony had agreed without hesitation even after being briefed on what would be expected of her.

Celestia looked at a small, gold colored watch on one of her forehooves. She had gotten it to better keep track of time whenever she had to attend to her royal duties, determined to make them end more quickly if possible so that she would have more time to tend to every need of Twily's. "That's what a good mother should do." She thought to herself as she noticed that if all was going as planned, the next playmate for little Twily should be arriving very shortly.

Twilight, for her part, was already padded up and waiting within her bedroom. She made sure her padded plot was kept well hidden, so that any unsuspecting ponies who might stumble into the room by accident wouldn't discover her secret. All she could do now was wait, knowing that Princess Celestia was due to return at any minute, probably with another playmate in tow. Whoever it was, Twily was sure she was going to enjoy playing with them, doing whatever the playmate wanted to do.

So why did it seem like it was taking so long for Celestia to enter the room? Twilight was starting to grow just the slightest bit worried. "Do you think something happened to Mommy, Smarty Pants?" She asked the old doll.

Smarty Pants replied. "Come on, Twily. Your mommy is the strongest, smartest, nicest pony in all of Equestria. She'd never let anything happen to her. I'm sure she'll be here any minute. Just be patient."

Twilight plopped onto her padded posture and pouted. "Oh, but I hate waiting! I've been extra good today: I even kept my diaper clean for her, just like Mommy would want me to, even though I really didn't want to."

Fortunately for the padded princess, her lack of patience was not about to be put to the test. For a mere moment or so after she had finished speaking to Smarty Pants, she saw the knob on the door start to turn. Her heart began to beat with anticipation! Could it be?!

Sure enough, when the door opened all the way, in strolled Princess Celestia with that motherly smile on her face. "Hello, Twily!" She chipperly greeted, her voice radiating with love and warmth. "Sorry if I kept you waiting. But Mommy's here for you, now," She trotted over, looking her fellow alicorn over. "Do you need a diaper change, Twily? We wouldn't want you to get a rash."

Twilight shook her head from side to side. "No, Mommy. I'm good. My diaper's nice and clean, see?" She turned around and proudly presented the pristine padding to the princess. "Tada!"

Celestia's smile grew brighter. "Oh, that's amazing, Twily!" She showered the younger alicorn with exaggerated praise, treating her more like a potty training toddler instead of a full grown mare. "Good job!" Then she cleared her throat. "Then I guess that means you're ready to meet your next playmate."

"Ooh! Who is it?!" Twilight excitedly asked, already trying to think of who it might be!

Princess Celestia gave off a light laugh, then turned back towards the open door. "You can come in now." She said to it, apparently speaking to somepony waiting on the other side of it.

As if on cue, the sound of shuffling hooves could be heard as a very familiar earth pony mare came into the room, noticeably waddling about. Said earth pony currently had a violet colored pacifier dangling from a string around her neck, and instead of her usual dull green tunic was a somewhat more brightly colored green onesie that just barely fit her. Said onesie doing a very poor job of concealing a thick, white diaper that hugged her rear tightly.

The padded alicorn gasped as her eyes went wide! "No way!" She exclaimed in disbelief. She recognized this pony at once, but it was one of the last ponies she would've ever expected to see in diapers. "You're... Maud Pie!"

Maud Pie nodded quite slowly, speaking in that usual emotionless tone of hers. "Yes, Twily," She greeted the princess, using the assigned name for when Twilight was in her "little" headspace. "It's me. I'm here to be your playmate today. Your mommy told me all about it, and asked if I would join you," Something of a smile crept onto her face as she went on to say. "I figured it would be a good break from my rock studies at the university. The classes are very hard, and not just because they're dealing with rocks," She paused and blinked before adding. "That was a joke."

"Oh, sorry," Twilight replied and tried to snicker and chortle as best she could. "That was a good one, Maud. You're very funny! No wonder you and Pinkie Pie are sisters."

Maud nodded and seemed to blush. "Well actually, Pinkie Pie doesn't know about this yet. I haven't told her. If she found out... well, she'd probably start trying to take care of me the same way she takes care of the Cake twins. It'd be kind of weird to be foalsat by your baby sister instead of it being the other way around."

Twilight gave a knowing wink. "Relax, Maud. Your secret's safe with me. I won't tell a soul. And neither will Smarty Pants. Right, Smarty Pants?" She turned to the doll.

Smarty Pants quickly replied. "Of course, Twily. I couldn't tell anypony if I wanted to. You're one of the few ponies who understands me. Most ponies think I'm just an imaginary friend, even though we both know I'm not. I've been your friend since you were in diapers."

Twilight nodded back. "Uh-huh. We did everything together, I took you with me everywhere I went until I started attending magic kindergarten. Then I had to put you away so other ponies wouldn't make fun of me. But I still slept with you until I outgrew that too."

Maud only commented. "It must be nice having somepony you can trust to share secrets with," She looked down at herself. "The only friends I ever had were rocks. They're good listeners."

"Like Boulder?" Twilight questioned.

"Like Boulder," Maud replied. "I wanted to bring him with me, but I decided against it. It was a long train ride to get here. I didn't want to risk losing him."

The padded alicorn nodded back. "Uh-huh. I know I'd be really upset if I lost Smarty Pants anywhere. That's why I keep her with me at all times. I never let her out of my sight!"

Princess Celestia then smiled as she made sure to use her magic to carefully close the door behind her. "Well, it looks like I won't have to worry about either of you causing any trouble. You two can just stay here and play together all day long."

"Today is a good day to stay indoors," Maud spoke up as she pointed to a nearby window. "It's raining outside today." Sure enough, a quick glance out said window revealed that the sky was full of rain clouds. There wasn't any thunder or lightning, just rain and a lot of it.

"Aw, but it's fun to play in the rain sometimes." Twilight playfully whined.

Celestia shook her head from side to side and motherly scolded. "I don't think so, my little ponies. I wouldn't want you to get sick or covered with mud. That would take ages to clean up. Today is a strictly indoor play day. No ifs, ands, or buts."

Maud Pie then asked. "Speaking of butts," She looked back to her padded rump and asked. "Am I allowed to use the toi..." She paused and quickly corrected. "... the potty? Or do I have to stick with my diaper?"

The sun princess told the earth pony. "As long as you ask for permission first, you can use the potty if you want to, Maud. After all, Twily's in potty training too. We're still working on getting her to use the potty more often, even though I don't mind changing her."

"Okay," Maud blinked very slowly, then turned to Twilight. "So, what do you want to do first?"

"Well," The padded alicorn tried to think. She scratched her head with a hoof, but couldn't come up with anything. "What do you want to do, Maud? What kind of games do you like to play?"

The padded earth pony mare hmmed, popping her violet colored pacifier into her mouth and suckling on it as she was deep in contemplation. At last, popping the pacifier back out of her mouth, she proposed. "I have some special blocks that I made. We can play with them. There's a special kind of game I really like. I'll teach it to you."

Twilight clapped her hooves together. "Oh boy! A brand new game! Sounds like fun!" And she grabbed Smarty Pants with her magic. "Come on, Smarty Pants! Let's see if we can beat Maud at her own game!"

With only the steady downpouring of rain to serve as background ambience, the two padded ponies found a secluded spot in a corner of the bedroom with which to play with Maud's special blocks. They sat down across from each other, with Princess Celestia keeping a watchful eye on them from afar.

Before beginning the game, Maud Pie looked to her onesie and asked Twilight. "Is it okay if I take off my onesie first? I find it easier to concentrate with just my diaper and my pacifier."

Twilight nodded her approval. "That's fine by me, Maud. Whatever makes you feel comfortable."

Satisfied with the response, Maud turned her full attention to her onesie and slowly unbuttoned it. It seemed like she was quite skilled at the art of taking off and putting on her onesie, because in a matter of seconds she had fully unbuttoned it and set it aside. Now her diaper showed visibly, crinkling audibly and swaying with each step she took. When she sat back down, it compressed and crinkled even louder.

"So, how do we play, Maud?" Twilight Sparkle asked as she eyed the rather unusual blocks Maud had brought. They appeared to have been carved out of actual rocks, instead of being made of soft foam or wood like your usual foal blocks.

The padded, rock loving earth pony calmly explained to her playmate. "We each have our own stack of blocks: You've got yours and I've got mine. We take turns arranging and stacking them, and whoever uses all of their blocks first wins."

"Ah, I see," Twilight beamed. "That sounds easy enough. So who goes first?"

Maud raised up a hoof. "Not so fast, it's not that easy. See how each block is made of a different type of rock?" She held up two blocks that at first glance seemed to be similar, and explained. "For example: This one is made of quartz, and this one is made of limestone. You can only place blocks on top of each other or next to each other if they're of the same group: Igneous, sedimentary, metamorphic, or mineral. If you place rocks that aren't of the same group together, you lose. And you also lose if you can't place any blocks, or if your rock tower falls over."

Twilight blinked slowly. She was surprised by how... detailed this game was. She realized that she probably shouldn't have been so caught off guard given how much Maud loved rocks. Yet it still surprised her all the same. "You really went all out for this game, Maud."

Maud Pie nodded, then hoofed her opponent a piece of paper. "This should help you if you get stuck. It explains what rocks can go together and which ones can't. I don't need it because I know everything about rocks, but other ponies don't," A sigh escaped her lips. "I've really wanted somepony else to play this game with me, but I've never been able to since I left to get my rocktorate. The only ponies I played this game with before are Mom and Dad, we used to play it together when I was a foal."

The padded alicorn smiled. "Well, I'm happy to play this game with you as many times as you want, Maud," And she happily encouraged. "Why don't you go first, then? I think I get it, but I'll feel a lot more confident once I see the expert make her move."

Popping the violet colored pacifier back into her mouth, Maud thought for a moment before making the first move. She placed a block made of marble on the floor in front of her. Without taking the pacifier out of her mouth to speak, she said. "Your turn." The pacifier thus giving her words a slight lisp that could be heard even over the suckles.

Twilight turned to Smarty Pants while looking over her blocks. "Well, Smarty Pants, what do you think we should do for our first move? We should make sure the rock block we pick is one that can match up with the others."

Smarty Pants just replied by looking down at the piece of paper Maud had hoofed to Twilight. "I really don't know, Twily. I don't know much about rocks. Just pick one you think looks good. We're probably not going to beat Maud, she's got tons of experience with rocks. After all, she grew up on a rock farm."

Twilight gasped in realization! "That's right, I forgot! Pinkie even said they didn't really have diapers or foal toys growing up, they just used a pile of rocks for a bathroom. That means Maud probably had even less of a proper foalhood than Pinkie did. That must be why she likes to do stuff like this." Then she turned her attention to the rock blocks, eyeing them carefully and only occasionally glancing back at the piece of paper for reference. At last, she found one that she felt confident about using, and placed it on the ground in front of her.

Now it was Maud's turn to place a block. She spoke not a word as that violet colored pacifier of hers bobbed up and down in her mouth, all the while she was looking down at her blocks almost as if distracted by their intricate design. And after only a minute or so of silent contemplation, she made her move and signaled that her turn was over.

Several minutes thus passed as the two padded ponies took turns placing their rock blocks. Maud seemed to have no trouble deciding what blocks to place where to keep her tower balanced while making sure they matched, but Twilight found it rather difficult to follow all of Maud's rules. It didn't help that there was a nagging feeling in the back of the padded princess' mind about why Maud Pie seemed to be so at home with the mindset of a foal. It couldn't just be like Pinkie Pie in that she was trying to relieve a foalhood she never really had growing up on a rock farm. It had to be something more.

Yet the young alicorn found herself stumped about the best way to go about asking for more information. Maud could be a very difficult pony to read for ponies who didn't know her personally. Pinkie Pie seemed to be the only one who truly understood what made Maud Maud, no doubt because of their tight sibling bond that reminded Twilight a lot of the bond she shared with Shining Armor (or the bond between the Apple siblings for that matter).

At last, Maud broke the unofficial spell of silence by popping the pacifier out of her mouth, and she told her playmate. "You lose."

Twilight blinked in surprise. "What?"

Maud explained by pointing to the last block the princess had placed. "You just placed pyrite on top of sandstone. Those are not matching rock types, so you lose."

"I think she's right, Twily," Smarty Pants spoke up. "Those rocks don't look very similar to me."

The padded princess eyed her rock tower carefully. She couldn't tell for sure if Maud and Smarty Pants were correct, but she was inclined to believe them. Still, she wasn't really mad or upset about losing. It had been fun while it lasted.

Maud Pie stood up very slowly, trotting over to Twilight. "It's okay. I had fun playing with you. I hardly ever lose at this game unless it's on purpose. I'm just glad I had somepony willing to play this game with me. It's been so long since I was able to play it with anypony."

The young alicorn then saw fit to ask. "Can I ask you something, Maud?"

Maud blinked slowly and seemed to smile. "You just did."

The padded alicorn giggled in response. "Oh, I get it. Very funny, Maud," Then she cleared her throat and resumed questioning. "Is there a reason why you like to do these things? Is it because you grew up on a rock farm? Or is it something else?"

The earth pony mare didn't answer right away, she was too busy looking at Twilight's rear. After doing so for a good minute or two, she spoke up. "You should probably get changed first."

"Huh? What do you mean?" Twilight questioned, only to suddenly feel herself be levitated into the air by none other than Princess Celestia.

The sun princess seemed to be struggling to suppress a smirk. "You mean you haven't noticed yet, Twily? Your diaper is very wet. I'm surprised it hasn't leaked." With her magic, she effortlessly carried her charge across the room to the changing table and laid her gently upon it.

A raging blush formed on Twilight's face despite the fact that this was far from her first diaper change. "I... I didn't even notice. I was having so much fun playing Maud's game," She unhappily sighed. "And after I was so good at keeping my diaper clean, too. I'm sorry, Mommy."

Celestia just gently reassured Twilight while carrying out the diaper change in the blink of an eye. "It's okay, Twily. This is why you're not ready to get out of diapers yet. Everypony has accidents from time to time, even when they're in potty training like you are. It doesn't mean they're not trying. Just remember that if you ever do feel like you have to go, let me know so we can work on getting you on the potty. Okay?"

"Okay, Mommy." Twilight sincerely nodded as a fresh, spotless diaper was taped to her rump. She happily wiggled about in it, letting the fresh scent of cornstarch from the powder tickle her nostrils.

Once the diaper change was complete and Twilight was lifted off the changing table, she trotted back over to Maud (who had respectfully turned her head while Twilight had been undergoing the change just a moment earlier) and asked her unanswered question from earlier. "So, Maud, can you answer my question now?"

Maud blinked slowly once again, looking back to her own diaper as if she suspected something was off about it. Yet there was nothing to indicate anything was. It still looked clean, and there were no smells wafting through the air to suggest it had been used. So the rock loving earth pony explained. "Well, it all started when Marble started wetting the bed. It started happening not long after Pinkie Pie got her cutie mark."

"But if Marble was the one wetting the bed, wouldn't that mean she was the one who got put back in diapers?" Smarty Pants questioned.

Twilight made a shushing motion to Smarty Pants. "Smarty Pants, not now! It's rude to interrupt ponies when they're not finished talking!"

Maud wasn't bothered by the interruption. She just resumed speaking. "Marble did get put back into diapers for a little while because of that. And Limestone started teasing her about it. So I started wearing diapers too to make Limestone stop. It worked," A smile started to form on her face as she recalled. "At first I only thought I was going to be in diapers until Marble stopped needing them. But then I started to realize how much I missed wearing them as a foal. Once I was old enough, Mom and Dad took away my diapers and told me I could just go in the fields or on a pile of rocks like Limestone did. We didn't even have indoor plumbing at the time, so we didn't have anything other than chamber pots to use for potties."

Twilight's eyes went wide as she let out a gasp! She'd suspected that the Pie family had been rather... simple in their lifestyle. But she'd never once believed that they had gone without indoor plumbing for so long. It just seemed like something that everypony had access to these days, even more so than electricity.

"We did eventually get a flush toilet installed," Maud went on. "But we still mostly did our business in the fields, until Mom and Dad found out that other places don't really like it when you do that sort of thing. So we all had to learn to use the flush toilet in the outhouse instead. Marble actually thought it was a monster at first because it was so loud. Of course, I knew it wasn't, and eventually even Marble knew that too. But during the time I was learning how to use a toilet, I started to realize how much I missed being in diapers and being a foal."

The padded princess silently nodded. Since getting Smarty Pants back from Big Macintosh, she'd come to learn just how much she cherished memories of her foalhood. That had served as the catalyst by which she'd slowly gotten back into diapers, which in turn had led to her being babied by Princess Celestia.

Maud Pie continued. "So I started secretly buying my own diapers and smuggling them in so Mom and Dad wouldn't find out. It felt nice to feel softer than my surroundings," A smile slowly formed on her face. "Even using them again from time to time actually didn't feel as bad as I thought it would be. The only problem was getting rid of the evidence afterwards so nopony would know. I thought about telling Pinkie and Marble because I was sure they'd understand, but I didn't want them to get in trouble with Mom and Dad if they found out, so I just kept the secret to myself until I went away to study for my rocktorate. Now, I have freedom to wear and use diapers, and act like a foal."

Twilight waited to see if Maud would speak even more. But the rock loving earth pony was silent, signaling that her little speech was done. With that belief in mind, the padded princess waddled her way over to Maud and nuzzled her deeply in the side. "Well, your secret's still safe with Smarty Pants and I. And my mommy too. We won't tell anypony what you do with diapers. I think it's nice that you get to have the foalhood you didn't get to have on the rock farm."

"Thanks," Maud replied with a slight smile, showing more emotion than she usually did. "You're the first pony I ever felt brave enough to tell all of this. There was one other pony besides my sisters I thought of telling," A brief image flashed in her mind of that very pony. "But I only just started seeing him. I don't think I'm ready to tell him just yet. Especially since I don't know how I feel about him or if we'll see each other more often."

Princess Celestia then clapped her hooves. "Well, that was very brave of you to confess like that, Maud. You truly are a brave little pony. And a brave little pony like you deserves a reward," She cooed. "How would my little ponies feel about a snack of freshly baked chocolate chip cookies? I'm sure I could find some in the royal kitchens to share with you both. You deserve it for being so well behaved."

Twilight Sparkle eagerly licked her lips! "Oh boy! Cookies!" She started jumping up and down in excitement! "Aren't you excited too, Maud?!"

"Oh, I am," Maud replied as she returned to her usual stoic tone of voice. "Cookies do sound good. I remember that Granny Pie used to bake them all the time when she foalsat my sisters and I. That's how Pinkie Pie formed such a close bond with her."

The sun princess smiled and gave a knowing wink. "Looks like it's a deal, then. You two wait here." She disappeared in a flash from her horn, only to return shortly with a plate full of steaming hot chocolate chip cookies that she set down on a table.

It took every ounce of patience Twilight had not to immediately run to the table and grab a cookie off the plate. She knew she had to wait for permission from Celestia first, and that would only come once the cookies had cooled off a little.

Princess Celestia took advantage of this opportunity to say to her charge. "Well, Twily, I believe now would be an excellent time for you to try and use the potty."

Twilight let out a faint, seemingly playful whine. "Do I really have to, Mommy?"

"Come on, Twily," Smarty Pants encouraged. "Don't you wanna show Maud that you can be a big pony too?"

The padded alicorn sighed and folded. "Oh, alright. I'll try." She then let Princess Celestia lead her along to the bathroom, her diaper crinkling all the while.

Maud Pie, for her part, just popped the pacifier back into her mouth to suckle on it anew. She smiled as she looked back to her diaper, sitting down and poking at it just for the fun of it.

As for Twilight, the padded princess was soon promptly placed on the porcelain throne as her diaper was pulled down to her knees.

Princess Celestia encouraged in that motherly tone of hers. "Go ahead, Twily. Do whatever you have to do. I'll be right here if you need me. I promise, I won't let anything happen to you."

So the young alicorn just sat there, hind legs dangling off to the sides of the toilet. It was hard to tell whether this was part of her act, or if she truly wasn't thrilled about being forced to use the bathroom. True, she'd done it before whilst still in diapers: Both for her big brother and for her mother, and both times it hadn't been bad at all. Would it really be asking so much of her to use it again in front of Princess Celestia?

At last, the silence was broken as a faint tinkling sound could be heard echoing across the bowl. Celestia smiled, knowing what such a sound meant. "Well done, Twily!" She cooed with only slightly exaggerated praise! "I knew you could do it if you just tried. See how easy that was?"

"It was pretty easy, Mommy," Twilight beamed. "But it's okay if I still want to use my diaper sometimes, right?"

The alicorn with a majestic white coat happily nodded. "Of course, Twily. Whatever makes you happy. You don't have to use the potty all the time, just once in a while is good enough." She proceeded to help her fellow alicorn wipe up, then flushed the toilet, before pulling Twilight's diaper back up and directing the padded alicorn to the sink to wash her hooves.

The two alicorns then exited the bathroom together, and Celestia smiled as she eyed the plate of cookies. "Okay," She declared to both her charges. "I think the cookies have cooled off enough, my little ponies."

Maud yet again popped the pacifier out of her mouth and let it dangle from that string around her neck. She then waddled over with practiced precision to join Twilight at the table, as the two padded ponies had bibs tied around their necks (Celestia setting Maud's well worn pacifier aside for cleaning later).

Twilight and Maud then grabbed cookies off the plate one by one, shoving them into their mouths as crumbs flew everywhere!

Princess Celestia didn't mind at all, just sitting there and watching her charges devour the cookies at lightning speed until there were none left! Afterwards, she just casually retrieved a rag and used to wipe off both padded ponies' faces. "My, what messy foals I have." She cooed and chuckled at the same time.

"I couldn't help it!" Twilight giggled with playful innocence. "Those cookies were really good, Mommy!"

Celestia seemed to nod in agreement. Then, after wiping off Maud's face, she declared. "Well, you know what goes good with cookies, right?"

The padded alicorn immediately knew what Celestia had in mind, happily shouting! "Milkies!"

The sun princess gave a confirming nod, before exposing her teets. "That's right, Twily. Milkies from Mommy," She trotted carefully forward, motioning for her fellow alicorn to approach. "You know what to do, Twily. Just don't drink too fast, now," Then she turned to Maud. "Don't worry, there's plenty of milkies for you too, Maud. I'm sure you'll want something to wash those cookies down."

"Besides," Twilight said as she licked her lips. "Mommy's milkies are really, really good!" Soon afterward, she wrapped herself around one of Celestia's exposed teets and started to slowly suckle it. It wasn't long before her efforts were rewarded, as the rich, creamy taste of warm breast milk trickled down her throat.

Maud hesitated for but a moment before joining in. She loosely remembered her mom breast feeding Pinkie and Marble when they were really little, having done so without ever once flinching or showing any emotion. Looking back on it, the first signs that Pinkie Pie would turn out differently from her other sisters had been apparent: She had been far more energetic and enthusiastic about drinking the milk compared to Marble, and Cloudy had briefly mentioned how it was unlike when she'd nursed Limestone and Maud.

Maud Pie shut her eyes, remembering those memories long since past. She could well remember how much pride she'd initially taken in being the pony amongst her four siblings who had been the least difficult to raise as a foal. She hadn't put up a fuss at all while in diapers, and hadn't registered a syllable of protest when told she was old enough not to need them anymore. She had also at least initially taken great pride in being the first among her sisters to master use of the new flush toilet after it was installed, and thus being called upon to assist her sisters in learning how to use it as well.

Looking back on it all, however, the rock loving earth pony now found herself filled with the faintest hint of regret and longing. Her foalhood had basically been decided for her. She had gone along with every decision her parents had made without ever once thinking that she had any other choice. Only when she had informed her parents of her intention to leave the rock farm and go away to study for her rocktorate had she at all decided for herself what to do. Well, that and her secret effort to buy, wear, and use diapers.

The earth pony mare was only snapped out of her ponderings by the sudden sound of the passing of gas. Almost before she realized it, she was wetting and messing her diaper almost entirely on instinct. So distracted had she been with her memories and ponderings that she hadn't noticed at all the warning signs her body had been trying to send to her brain. But it was too late to stop her body from relieving itself. Fortunately, it was all over very quickly. And her diaper more than did its job of containing everything she had just done. Good thing she'd thought ahead and bought the extra absorbent brands.

"Oh, goodness!" Celestia dramatically exclaimed with a wave of her hoof. "Did my milkies do that to you, Maud? I've never had that happen before."

Maud Pie just blushed bright red with shame. "I guess I just wasn't paying attention. But isn't that what a foal would do?"

Twilight giggled and laughed. "Yeah, it defintiely is, Maud."

"Oh goodness!" Smarty Pants remarked as she threw a hoof over her face. "And here I thought Twily was the stinkiest baby there ever was!"

Maud just sighed. "Growing up on the rock farm, I got used to smells like this even after we had the flush toilet installed." Then she felt herself be lifted into the air and carried to the changing table to have her diaper changed.

Maud Pie most certainly enjoyed her playtime with Twilight on that cloudy, rainy day. A part of her wished more than anything that it didn't have to end and that she could go on playing forever. Alas, the rational part of her mind told her that was impossible. Like it or not, the day came to an end. And that meant Maud had to go back to being a big pony again, though not without promising Princess Celestia not to share a word about Twilight's secret with anypony (except for Pinkie Pie, but only because the pink party pony knew about the secret too).

Upon returning to her dorm room at the university where she stayed, however, the rock loving earth pony was most surprised to find that there was a letter waiting for her on the nightstand next to her bed. Being a curious sort of pony, she trotted over to inspect the letter and picked it up. It read as follows:

Dear Maud Pie,

Thank you again for agreeing to be Twily's playmate. I think she really enjoyed getting to confide through you some of her conflicting feelings about why she likes to do all of this, as much as she enjoyed having somepony on her level.

Rest assured, I don't think any less of you for what you told me. If you ever decide to tell anypony else about your secret, you'll have my support.

I hope you don't mind, but I took the liberty of arranging a little something for you as a reward. If you ever feel like you need a break from being a big pony, just let me know. I'd be happy to arrange for another playdate between you and Twily.

Sincerely,

Princess Celestia

Looking underneath the letter, Maud was shocked to discover an attachment to it! It was a flyer advertising an archeological dig that was to take place in the Ghastly Gorge, a mere hour or so train ride from Ponyville. Specifically, this dig was hoping to hire somepony skilled and well versed in identifying various rock formations, so as to aid in the mapping out of the gorge and its surrounding environment.

Maud Pie knew at once that such an opening was perfect for her. Not only would she be able to put her applied knowledge to work in a real life environment, but she might have the opportunity to swing by Ponyville when it was all over. Having learned that Pinkie Pie had been put in charge of Sugarcube Corner a while back, Maud felt that perhaps she could surprise her sister in more ways than one.

Moonie (Moondancer)

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Author's Notes:

Moondancer won the tiebreaker this time, so she gets to be the character of focus here. Inspiration was partially drawn from her prompt in "Potty Training Tales", which can be viewed here. I also drew a little bit from Something to Rave About 2: Second Night, itself an unofficial sequel to Something to Rave About. There is also a faint refernece to Photoshoot by Nido_King.

Tiber Septim II proposed having Twilight and Moondancer do a clown act to make Celestia laugh, and Scootabom1 proposed having Celestia use a spell to make them go on a storybook adventure (after previously suggesting it be a bedtime story adventure). So I decided to combine them both into a sort of storybook circus, like the expansion of Walt Disney World's Fantasy Land.

Again, remember that you are free to vote for any characters not already voted on as long as they meet the eligibility requirements. And you can also propose what you'd like those characters to do with Twily. As a reminder, you don't have to do it in a comment here. You can post suggestions and cast votes via PM if you'd rather do that.

Characters previously voted on:
Cheerilee - Two votes
Lyra (with Bon Bon) - One vote

"Oh my goodness, Twily!" Princess Celestia exclaimed in only slightly exaggerated fashion, fanning a hoof across her nose to try and ward off the powerful stench that was wafting through the air. This wasn't the first time she'd changed the dirty diaper of her fellow alicorn and princess, but it seemed like this one was especially stinky for some reason. "What did you eat that made you so stinky today?!"

Twilight failed to hide the raging blush on her cheeks as she lay upon the changing table fully exposed, her dirty diaper opened to reveal the extent of her shame. "Sorry, Mommy," She appeared to sincerely apologize. "I didn't think it would be that bad, really. But I didn't feel like using the potty," She whimpered and shrank from the sun princess' gaze. "Please don't be mad at me. I promise I'll try harder to make it to the potty in time the next time I have to go poo poo."

But Celestia simply shook her head and gently reassured Twilight. "I'm not mad at you, Twily. I want you to do whatever makes you comfortable. I shouldn't be trying to put pressure on you to use the potty if you'd rather stick to your diapers. I really don't mind any of this." She proceeded to toss the dirty diaper into a diaper pail, and set to work on wiping the young alicorn's stinky flanks. As she did so, she couldn't help but think. "Twilight's been doing number ones and number twos in her diaper far more often as of late compared to when we started doing this. Luna hasn't voiced any further concerns yet, but is it possible this is starting to negatively affect Twilight in some way? Making her regress and act like more of a foal?"

Unsure of herself, the sun princess just continued the wiping job, all the while continuing to think. "Oh, what am I so worried about? Twilight's using her diapers more often because she feels more comfortable doing so around me. Besides, I've helped her open up to so many of her friends, and they've all accepted this side of her. Even her parents don't seem to mind it. So I'll keep doing it as long as she still wants me to do it. She knows she can stop at any time." Just to be sure, she immediately saw fit to ask her fellow alicorn. "Twilight?"

The recently wiped clean young princess looked up at her fellow alicorn, surprised to be called by her real name instead of her more foalish name. "Yes, Mommy?" She asked in uncertainty, her voice sounding just a touch more... mature for lack of a better word.

The elder alicorn paused in hesitation for a moment, apparently deep in contemplation. Then at last she said. "You do know that we can stop this at any time if you feel uncomfortable, right?"

At that, Twilight let out a playful, foalish giggle and wiggled about on the changing table. "Of course I know that. Why would I want to stop? You're the best mommy ever! I mean it! Only you could care for me no matter how stinky I get or how many messes I make."

That seemed to satisfy Celestia, who breathed a sigh of relief. "Well, as long as you think that way, Twily, I won't force you to stop. But if you ever change your mind, let me know. And remember," She added with a knowing wink. "You can't tell anypony not already in the know. The tabloids would have a field day if they found out you're still in diapers at your age."

"I can't help it if I like my diapees, Mommy!" Twilight giggled some more. "Now come on, put another one on me!" And she lay back down on the changing table in anticipation.

Princess Celestia quickly unfolded a new diaper, taped it to Twilight's rump, and sprinkled in a generous helping of foal powder to ensure there wouldn't be a rash. Then she helped her fellow alicorn down from the table. "There we go, Twily. All nice and clean again."

"Thank you, Mommy!" The diapered princess gave Celestia a big hug, then waddled over to where she had left Smarty Pants lying on the floor. She picked up the old doll and said to it. "Sorry that took so long, Smarty Pants. But now I'm back, we can play again."

"Playtime with you is always a blast, Twily." Smarty Pants said in reply.

Yet it was then that Princess Celestia clapped her hooves, drawing Twilight's attention. "Now Twily, you should wait. There's a certain somepony who I'm sure would love to play with you and Smarty Pants."

Twilight became all excited, her eyes going wide! "Really?! Who is it this time, Mommy?! Do I know them?!"

The sun princess nodded as a big smile crept across her face. "Oh, I'm sure you do. The two of you go way back, back to when you were just little ponies. Maybe even before then. Heck, you two are so alike you could probably pass for twin sisters if I didn't know better."

Almost immediately, a picture of the pony Celestia was talking about formed in the padded alicorn's mind. She let out an excited gasp, bouncing up and down in anticipation! "You mean it's...!"

Before Twilight could finish her sentence, the door to her bedroom turned. In trotted a familiar looking cream coated unicorn mare with glasses. She had shed the black sweater she usually wore, and had taken the liberty of styling her mane and tail to look exactly like Twilight's. Around her flanks was wrapped a thick, white, very poofy diaper that pushed her legs apart. Yet she trotted about in it no problem despite the waddle it gave her movements.

The unicorn waddled right up to Twilight and giggled, swishing her tail and showing off her padded posture with pride. "Hi, Twilight... I mean, Twily," She corrected herself, pushing her glasses into place. "Sorry, still getting used to that."

Twilight felt her wings poof outward in excitement! She immediately pulled the unicorn in for a big hug! "Moondancer! Oh, I can't believe it's you!"

Princess Celestia watched the scene unfold with a smile of her own.

When the hug ended, Moondancer blushed. "I'm actually kind of surprised that you of all ponies are into this: Wearing diapers and acting like a big foal. I thought I was the only one among our friends who wanted to go back to diapers: Wearing and using."

"Why would you think I wouldn't be into this?" Twilight questioned her new playmate. "With how close we were when we were younger, why would you think you'd be the only one wanting to go back to diapers full time? Or at least, as close to full time as possible?"

Moondancer appeared to frown, her eyes narrowing a bit and her tone of voice taking on one of resentment. "Don't tell me you've forgotten. We were the first among our peers to be potty trained, only Lyra ever got a leg up on us because she was already using the toilet when we were stuck with training potties. And on your third birthday, you demonstrated quite clearly that your decision to hold off on starting the training until then was wise. You didn't have a single accident after you started, whereas I had several."

At that, the padded alicorn seemed to remember and recall memories long since passed! "Oh!" She exclaimed in realization. "I remember now," She then giggled a bit. "And at your next birthday party, your parents made you sit on the big potty for hours with everypony watching. I know some of our friends who didn't know better were wondering if you were gonna go down the drain."

"Is it bad if I wished I could've, just to be able to get away from everypony?" Moondancer lamented. "It was so embarrassing to sit there in front of everypony. I was never good at using the potty in front of others. Demonstrating it was always harder than when I just did it. You didn't seem to have that problem, and neither did Lyra. Even Minuette, once she finally started potty training, could do it no problem. I was always the shy one who couldn't do number one or number two for anypony other than my parents or my big sister."

Twilight blushed, levitating over Smarty Pants. "Well, I could only really do it because Smarty Pants helped me. She'd always sing to me whenever I was on the potty, even the big potty. If it wasn't for her, I couldn't have tinkled a drop, let alone do anything else. Isn't that right, Smarty Pants?"

Much to Moondancer's shock and surprise, the doll spoke. Of course, she knew it was really Twilight speaking through the doll, but it still surprised her all the same. "It's true. Twily just needed a distraction, because otherwise she'd start thinking about why she hadn't gone, and that made it harder for her to go pee pee or poo poo. I'm guessing you never had anypony do that for you."

The glasses wearing unicorn's frown only slightly lessened as she replied. "No, never. I never would've believed Twilight of all ponies would need that kind of help. My parents seemed to think that if my big sister could be fully trained and out of diapers by the time she was four, there was no reason why the same couldn't be true for me. And if my big sister hadn't been so willing to teach me how she did it, I probably wouldn't have graduated from diapers until I was in magic kindergarten."

"Well, at least we still had our little secret club between ourselves and Lyra," Twilight giggled. "Even if it wasn't much of a secret. We only got to maintain it for about a year before all our friends started potty training too. I know we were all shocked when Minuette finally got out of diapers. She was still wearing them when she was in magic kindergarten, not that it seemed to bother her."

Moondancer sighed anew. "Yeah, and I wouldn't be surprised if I found out she wanted to go back to diapers. As far as I know, she hasn't. But maybe she's like you and she's really good about keeping it a secret," She looked back to her own well taped diaper. "I thought once I finally worked up the courage to try wearing diapers again, that all my fears and worries would just disappear. They didn't. I even went to this special club just for ponies like me who like to wear diapers. But all I did was draw more unwanted attention to myself," She shuddered. "If the club DJ hadn't intervened when she did, I probably would've died. At least she was understanding, she was just as insecure about diapers as I was. But I haven't mustered up the courage to go back there yet."

Twilight trotted over and nuzzled Moondancer in the side. "Well, your secret's safe with me, Moondancer."

"Just call me Moonie instead," Moondancer insisted in a somewhat upset tone of voice. "After all, you call yourself Twily and call Princess Celestia your mommy," She turned to the sun princess. "Do I have to call you Mommy too?"

"Only if you want to, Moonie," Princess Celestia replied in a motherly tone. "Just like with Twily, I want you to do whatever makes you feel comfortable and cared for. The only rule I enforce is that you can't change your own diapers. After all, foals don't know how to do it. That's why they have mommies and daddies to do it for them. Don't worry, I'm used to changing diapers. Anything you do in them won't surprise me," She playfully added. "I just hope you're not as big a stinker as Twily is."

"Mommy!" Twilight playfully whined.

Smarty Pants just added. "It's true though, Twily. You can be really stinky sometimes."

"Smarty Pants! I thought you were on my side!" Twilight remarked as her blush returned with a vengance.

Moondancer, however, sympathetically replied to her fellow padded pony. "Hey, you can't help it if you're stinky. It's what foals do," She was quick to add. "I've never had somepony change my diaper, so I'm curious to see what it will feel like if it has to happen."

"Oh, it's the best feeling ever, Moonie!" Twilight happily exclaimed! "I'm sure you'll get to love it as much as I do if you get the chance to experience it!"

The glasses wearing unicorn simply sat down on her padded plot, making it crinkle. "Guess we'll just wait and see what happens. After all, I bought the thickest, most absorbent diaper brand I could find. It seems a shame not to test it out."

Twilight quickly moved to sit down next to Moondancer, showing support and solidarity for her fellow padded pony. The two big foals sat there for a bit, blinking their eyes whilst saying nothing to one another.

Of course, the spell of silence didn't last long. And Moondancer was soon asking. "So, what should we do, Twily? I assume you know more than I do what kind of fun big foals like us can have."

As if in response to the glasses wearing unicorn's question, both padded ponies heard their stomachs emit audible gurgles.

Celestia smiled and cooed. "Well, it sounds to me like we should have meal time first," Ushering her diapered charges to either side of her, she gestured. "Come, my little ponies. Let's go down to the royal dining room and get you fed." Then, she lit up her horn and teleported herself and her foals away.

The three reappeared in the empty dining room a moment later, Twilight and Moondancer both gasping as their mouths left gaping in awe at what they saw! Two large, elegantly detailed highchairs had been placed side by side at one of the long table, and both had their bars currently unlatched. It was quite obvious who they were meant for.

"Mommy, how were you able to get highchairs to fit us?" Twilight questioned as she and Moondancer were led before the highchairs and then floated into them via the sun princess' magic.

Princess Celestia happily explained whilst levitating both padded ponies into place. "Let's just say that when Luna went shopping after we learned Cadence was pregnant, she didn't quite know what size an alicorn foal would be. Cadence was too embarrassed to return all the supplies after she had Flurry Heart, so she asked me to hang onto them."

The younger alicorn giggled, kicking about in her pampers as the bar of her highchair was latched shut after she was placed into the seat. "Knowing Cadence, she probably diapered my brother and used Luna's supplies for parenting classes while she was pregnant! B.B.B.F.F. always did tend to act like a big foal, which I guess isn't surprising given what I now know about his foalhood."

The glasses wearing unicorn sitting in the other highchair could only lament. "I wish my big sister was as fun and loving as your brother was, Twilight. Aside from demonstrating how big ponies go potty during my training, or helping me with my homework sometimes when I was a little older, she and I mostly kept to ourselves. And I can't imagine she'd be very proud of me if she saw me like this."

Twilight leaned over in her highchair to talk to her fellow padded pony. "Hey, who cares if your first foalhood wasn't so great? That's all the more reason why you should enjoy your second one and be free. Do whatever you feel like doing, not what other ponies tell you you have to do. If I could learn how to live without books, you can totally learn to do the same. After all, there aren't really books on being a big foal."

Moondancer adjusted her glasses and briefly fiddled with her mane a bit. "Yeah, I know. Aside from a psychology book that briefly touched on them, there wasn't a lot of subject material. All the other books I could find on foals had to do with foalcare and raising foals."

Celestia then approached the two diaper wearing mares as they sat in their highchairs, levitating several jars of different flavored foal food, complete with bright red colored plastic spoons. "It is time for num-nums, little ones," She turned to Moondancer. "I hope you aren't a picky or fussy eater, Moonie. These foods are some of Twily's favorites. So if she likes them, you should like them too."

"Couldn't I have something yummier?" The glasses wearing unicorn questioned. From the way she spoke, it was hard to tell whether it was an act or if she was being sincere.

The sun princess replied with a knowing wink. "Well, if you and Twily both behave, I believe there's some ice cream in the kitchen. But you need your nutrition first. After all, Moonie, I assume you want to grow up big and strong, just like Twily." And to prove her point, she fed her fellow alicorn first.

Moondancer watched in silence as jar after jar was unscrewed, and Twilight happily devoured the various colored goops as the plastic spoon was dipped into them. It was all done with practiced precision, which wasn't surprising given how close the two princesses seemed to be. They had settled quite comfortably into their assigned roles. Whereas Moondancer was still uncertain of just how far she wanted to go. She wanted to let go, to be as carefree as Twilight. But a small part of her brain kept nagging at her, telling her that this sort of behavior was wrong.

At last, Princess Celestia had finished spoon feeding Twilight. She proceeded to pat the younger alicorn's back a few times, causing Twilight to playfully let out a loud belch. The elder alicorn wasn't bothered in the slightest, and simply cooed. "Good girl, Twily. Let it all out," She then turned her attention to the other padded pony in her presence. "Okay, Moonie. Now it's your turn," Dipping a different plastic spoon into one of the jars, she soon brought it to the unicorn's mouth as she instructed. "Come on. Open up. Be a good little pony."

The padded unicorn reluctantly obeyed, opening her mouth as wide as she could. She swallowed hard when the spoon's contents were deposited onto her tongue. That's when the taste hit her! It was almost overwhelming! "Whoa!" She exclaimed as she leaned back in her highchair. "I can't remember the last time I tasted something so sweet!"

Celestia smiled. "Well well, seems like you're a pretty good foal when it comes to spoon feeding, Moonie." And she proceeded to repeat the process several times over.

By the time the spoon feeding was done, Moondancer was beginning to feel nice and full. She didn't even mind the fact that she'd gotten trace amounts of different flavors of foal food all over her face. She just licked her lips, cleaning her face as best she could. It seemed she was slowly but surely settling into the mentality of an adult foal, just a little.

The alicorn mare with a majestic white coat stood up soon afterward, declaring. "A deal's a deal, my little ponies. Stay right here while I go get the ice cream." She returned shortly with the aforementioned sweet treat.

The glasses wearing unicorn excitedly rocked back and forth on her pampers when she saw the flavor of ice cream! "It's my favorite flavor: Cookies 'n cream!"

"No way! That's my favorite flavor too!" Twilight declared. Whether she meant it or was just playing along was hard to tell.

Princess Celestia flashed a motherly smile. "Well, I guess it's a good thing there's still half a carton of it left. That should be plenty between you two both." She proceeded to deposit a large scoop of the ice cream into large bowls, which she then presented to both diapered mares still sitting in their highchairs.

Twilight and Moondancer polished off the ice cream in no time at all. And neither of them protested when their faces were wiped clean with a rag afterwards.

"My my, what messy foals I have today." Celestia cooed as she wiped off the stained cheeks of both her charges.

Twilight just giggled, as did Moondancer. They didn't seem to care in the least.

Once Princess Celestia was satisfied that she'd gotten all the stains removed, she levitated the wet rag away and unlatched the bars on both highchairs, watching as the two big foals tumbled out and onto their padded rears. They seemed to be having fun together. It really was like they were sisters it seemed.

The padded ponies and the princess returned soon afterward to the royal bedroom Twilight was staying in, Twilight immediately trotting over to Smarty Pants to pick her up, whilst taking notice of the fact that the doll's arms were folded over. "Sorry, Smarty Pants," She apologized. "I didn't think you'd like watching Moonie and I eat since you can't do the same."

"Oh, Twily, I'm not mad," Smarty Pants insisted. "Even so, I don't like it when you leave me alone for so long. You know we do everything together, even sleep together."

"Yeah, I know," Twilight nodded back to the doll. "And I promise, from now on I won't leave your side. You can join in the fun with Moonie and I."

Smarty Pants seemed to smile. "I'd like that very much, Twily. I know we're gonna have lots of fun together, just like we always do with your playmates!"

Moondancer then asked her fellow padded pony. "So, now that we've been fed, what should we do next? Any ideas, Twily?"

The padded alicorn started to think, when she was suddenly distracted by the sound of loud music. Curious to see where it was coming from, she waddled over to a nearby window to have a look, and Moondancer followed after her.

Looking off into the distance, the two big foals could see what looked like a rather large circus tent that had been set up within the very heart of Canterlot. Various vendors were selling things like carrot dogs, peanuts, popcorn, cotton candy, and other treats. Performers of all types trotted to and fro, getting everything ready for the show to take place under the big top. And the source of the loud music revealed itself in the form of a large pipe organ.

Twilight turned away from the window and excitedly jumped up and down as she asked Princess Celestia! "Can we go to the circus, Mommy? Please?" She adopted the best pleading face she could muster up.

"Yeah? Can we go? It sounds like fun." Moondancer commented as she joined Twilight in pleading.

Princess Celestia wasn't persuaded for a second. "And let everypony in Canterlot see you two in diapers? I think not," She sought to reassure the two. "There'll be plenty of opportunities to see the circus some other time. I'm sure it will be back in Canterlot before long. Or perhaps we can wait until it comes to Ponyville and visit it then. The ponies of Ponyville are far less judging than the ponies of Canterlot, especially since a good number of them already know about Twily's secret." She delivered the last line with a knowing wink.

Moondancer then proposed while looking to her padded plot. "What if we agreed to use the potty before and after we went to the circus? Then we wouldn't have to wear diapers, and nopony would know about our secret."

"Circus shows are rather long," Celestia pointed out. "And it looks like the show is about to begin. I'm not sure I could secure tickets for the three of us on short notice. As tempted as I am by your offer, Moonie, I'm not sure I can trust you and Twily to behave yourselves, especially since you'd both have to use the potty right now while I go get the tickets."

"Why can't we just use the potty at the circus?" Twilight questioned. "They have potties there, right, Mommy? We could go right before the show starts, or during a break."

The sun princess protested. "Absolutely not! The circus' bathrooms are filthy! I will not have you both getting sick on my watch!" She then apologized. "I'm sorry, my little ponies, but we will not be going to the circus today. Maybe if you two behave for the rest of the day, we can visit it tomorrow before they leave Canterlot."

Both padded ponies let out whines and sighs of disappointment. It seemed they had both been looking forward to the idea of going to the circus (even considering Twilight had been to a carnival and an arcade).

Smarty Pants then made the suggestion. "Hey, if we can't go to the circus, why don't we bring the circus here? We can make our own circus together!"

"With just the three of us?" Moondancer pondered.

"Why not? All we need is our imaginations," Smarty Pants encouraged. "Anything's possible when you use your imagination. And Twily certainly has an active imagination. Just ask her."

Twilight giggled, poking at her pampers. "It's true. I even thought the potty was a monster, until B.B.F.F.F. helped me realize it wasn't. With an imagination like that, we could easily make our own circus."

However, Princess Celestia spoke up. "Actually, who says the circus has to be pretend? What if there was a way for you to not only go to the circus, but be part of the circus?"

"What do you mean, Mommy?" The padded alicorn pondered.

But the glasses wearing unicorn seemed to know what the sun princess was suggesting. "You're thinking of Hayscartes' method, aren't you? I've been studying that, but I've never even come close to pulling it off."

Celestia gave a firm nod. "Well, perhaps it would be best if I attempted the spell then. As it just so happens, I have a storybook about the circus that's just right for foals of all ages. And if you run into any trouble or danger, I can poof us all back out of the book no problem."

Twilight's face began to light up like stars in the night sky! "That would be great, Mommy! Let's do it!"

The elder alicorn grinned, trotting away. "Alright then, it's settled. We'll go into the storybook circus together, and my foals will be part of the show. We'll get to go on an adventure from the safety of this room."

It wasn't long before Princess Celestia returned, holding aloft a rather large and brightly colored picture book with her magic. She placed it on the ground, letting her charges see the title that read: Let's Go to the Circus in large and foalish letters.

"Now, before we begin," The sun princess declared as she eyed the two padded ponies. "Does anypony need to go potty or have their diaper changed? Once we enter into the book, there'll be no opportunities for potty breaks or diaper changes until we come out of it."

Twilight swished her tail and innocently replied. "I'm good, Mommy. I don't have to go."

Moondancer chimed in. "I guess if Twily doesn't have to go, then I don't either." In the back of her mind, she was thinking. "I'm sure I can hold it until we get done with the story. Besides, Twilight apparently goes potty in her diapers all the time. If she can do it and not be bothered, then I can do it too if I have to."

Satisfied with the response, Celestia took the liberty of lighting up her horn. The magic quickly flowed out from her horn, enveloping herself, Twilight, Moondancer, and Smarty Pants. Then it turned to the book, shrinking down the ponies and doll as they were pulled into the book's large pages.

Following a bright flash, all found themselves within the pages of the storybook. Its surroundings slowly but surely came to life: A large circus tent that could fit hundreds of ponies appeared, filled up with cardboard cutouts and paper ponies that sat on benches on all sides facing three large rings.

Princess Celestia herself happened to be sitting in the audience, looking on as Twilight and Moondancer stood within the three rings. Even though the show had yet to begin, she clapped and cheered to show her approval of anything they would do.

"We are here at the circus," A high pitched, childish voice spoke up as the circus took shape. "It is inside of a very large tent that is called a big top. Ponies of all ages come from far and wide to see the show today."

Suddenly, Smarty Pants emerged in one of the rings with a large mane around its neck. The doll let out a ferocious roar! And just as suddenly, Twilight and Moondancer found themselves facing the roaring doll with whips. The voice from before declared. "There are all kinds of acts to see. The lion tamers and other animal trainers command all kinds of large animals to perform tricks for the crowd."

Twilight took the lead in doing what the narration had said. Cracking the whip, she uttered the command. "Smarty Pants, jump!" And the doll obeyed without question.

Moondancer quickly did the same, bringing up a large hoop as she shouted! "Smarty Pants, I command you to jump through this ring!" Sure enough, that's what Smarty Pants did.

Princess Celestia watched the performance with brief looks of concern, concern that melted away when she saw Twilight and Moondancer handle the doll turned lion with ease. Yet her worries returned when the doll disappeared and a new display appeared in a ring, Twilight and Moondancer popping up inside of said ring.

In this ring was a large tightrope that rose up towards the ceiling of the big top. There was a net beneath it for safety, but the net seemed a ways down. The tightrope, meanwhile, stretched across the entire length of the ring it was in, Twilight and Moondancer standing on opposite ends.

The voice continued. "Tightrope walkers and acrobats walk across a large rope, performing all sorts of incredible tricks. They are protected from harm by a large net that will catch them if they should happen to fall." And as soon as it finished, the two padded ponies were doing things like riding a unicycle across the tightrope, or holding a large pole for balance as they walked back and forth on the tightrope. The rope occasionally swayed, but did not break.

From there, the attention switched to the third and final ring as Twilight and Moondancer were brought safely back down to the ground. Suddenly, their bodies changed. Their faces were covered with a white powder that looked almost like a mask, and were heavy with make-up and eyeshadow. They wore bright yellow jackets and gleaming red suspenders that were comically oversized. Most noticeable of all, their noses became big and red, almost like bouncing balls.

Princess Celestia couldn't stop herself from laughing hysterically as she watched the two padded ponies run around the ring, performing all sorts of funny acts both separate and together. And it seemed she wasn't the only one who found the performance of the padded ponies to be absolutely ridiculous (in a good way, mind you). The many cardboard cutouts and paper ponies could be heard laughing too. Their joyous cries echoed throughout the whole big top.

Despite this, the voice from before could be heard clear as day as it said. "A very popular act in the circus is the clowns. They dress up in funny clothes and funny costumes, and wear lots of make-up in order to make ponies laugh. Some clowns are sad clowns that have sad faces, while others are happy clowns that have smiling faces. And they often travel around in tiny little cars that are much too small for them. Yet they manage to fit into them with the greatest of ease."

Sure enough, a tiny sized bright yellow car with a windup key appeared before the two big foals, and from it emerged Smarty Pants all dressed up to look just like Twilight and Moondancer. The doll proceeded to chase after the two with a big, rubber bat, and the padded ponies pretended to be scared, running this way and that.

Page after page went by, with Twilight, Moondancer, and Smarty Pants all changing as needed to fit the roles described by the book. The final act saw Twilight bravely climb into the barrel of a large cannon with only a helmet for protection, before Moondancer brandished a matchstick and used it to light a fuse. The flame traveled along the length of the fuse until it reached the cannon, which shot Twilight out with a loud "Boom!" She flew across the big top as the audience watched, many emitting gasps (Princess Celestia included)!

Fortunately, the padded alicorn landed safely within a large net at the other end of the big top. The audience burst into thunderous applause, with ponies clapping, cheering, and even whistling in approval.

From there, Twilight was magically brought back to the center ring with Moondancer and Smarty Pants, all of them now displaying costumes from their many different roles. And they all bowed as the audience tossed roses to them from their seats. The voice concluded by saying. "When the show is over, all the circus performers return to the center ring and bow to the audience. The audience may sometimes show their appreciation by tossing roses to the performers. The circus is a truly wonderful place to visit."

Just like that, the story was over. And with a poof, Twilight, Moondancer, Smarty Pants, and of course Princess Celestia all returned to normal as they exited the large picture book. The book then folded of its own free will, closing its pages until next time.

Princess Celestia had to quickly summon up a handkerchief to use in order to wipe the tears from her eyes. She had been laughing and crying with delight so hard. "Oh, I say, that was truly a magnificent performance! You were very brave little foals to do all those scary circus acts."

"Did we make you proud, Mommy?" Twilight hopefully asked.

The sun princess nodded back. "You most certainly did, Twily. You and Moonie were simply fantastic!"

Moondancer beamed with pride. "Well, Hayscartes' method did most of the work for us. We just had to play along with the story. As long as we did that, we were fine," She then excitedly exclaimed. "I can't wait to try that with other books!"

"Ooh! Ooh!" Twilight bounced up and down as she got an idea. "We should do a book on the big potty, then we can see what happens when you go down the drain! That way we can satisfy our curiosity without getting hurt."

"No, no," Celestia playfully protested. "I'm sure you two don't really want to find out. And there are safer ways to get the answers."

Smarty Pants shuddered. "I would never want to go down the hole! It sounds scary! If that happens, it sounds like you could never come back! You'd disappear forever!"

The elder alicorn then changed the subject. "Now, we've all had a very exciting experience. And I think it's time for all good little ponies to take their naps. But first," She lit up her horn, levitating both Twilight and Moondancer towards her as she exclaimed in overly dramatic fashion. "I have two very stinky fillies who are in desperate need of a change! You two really did a number on your diapers, didn't you?"

"Huh? What do you mean?" Moondancer questioned, only to feel her diaper squish as she sniffed the air. To her surprise, the stench that greeted her nostrils wasn't as unpleasant as she thought it would be.

Twilight just looked ashamed. "Oh, I did it again, didn't I? I even promised I'd try to make it to the potty."

Moondancer couldn't help teasing. "Well, that's what you get for trying to act like the big pony you aren't. Besides, who needs the potty when you're already wearing your bathroom?"

Celestia just giggled in playfulness as she levitated the two dirty diaper ponies to the changing table, opting to change both of their very wet and messy diapers at once. "Now girls, there's no need to make a competition out of it. Everypony has accidents from time to time, even big ponies. What matters most is being honest about them so you can get changed."

Moondancer thoroughly enjoyed the rest of her day spent under Princess Celestia's loving care. She found it so easy to slip more and more into her "little" mindset as time went by. By the end of the day, she no longer cared about whether she used her diaper or not. In fact, using it seemed to become almost second nature to her, as if her years of potty training didn't matter at all.

Of course, the day couldn't last forever. And Moondancer was a little disappointed when it had to end. Now she had to go back to being her boring grown-up self, the pony who had grown-up not according to her own wishes but to the wishes of her parents and her big sister.

Well, maybe that could change with another trip to The Fountain of Youth in Manehattan. But that would have to wait for at least another day.

However, when the glasses wearing unicorn woke up the next morning and changed out of her diaper (she was equal parts relieved and disappointed that it was clean), she was surprised to see a scroll sitting near her nightstand. Attached to it was a note. She picked up the scroll and unfurled the note. It read as follows:

Dear Moondancer,

Thank you so much for agreeing to be Twily's playmate and helping her come out of her shell more. I really do want her to feel comfortable in her role, and anything that helps her do that is always appreciated.

Of course, I'm sure I don't need to tell you that you mustn't tell anypony about Twilight's secret without consulting me first. Only certain other ponies know about this, for good reason.

As a reward for your efforts, I've attached something that should interest you. Twilight told me just how fascinated you are with Hayscartes' method, and how hard you've been working to learn how to cast it. I hope this scroll from the Starswirl the Bearded section of the Canterlot Archives helps you out. Starswirl learned a lot from studying Hayscartes, after all.

Sincerely,

Princess Celestia

Moondancer could barely keep her horn from betraying her as she started trembling with excitement! Unfolding the scroll, she saw that indeed it contained detailed notes on Hayscartes' method and how to perform it. This was just the sort of help she needed.

Now if she could just find time in her schedule to fit in, along with her planned girls' night with Minuette, Twinkleshine, and Lemon Hearts. Not to mention her hopeful return to The Fountain of Youth (assuming the DJ there hadn't quit).

As the glasses wearing unicorn began making her plans, she was unaware until too late that her bladder needed to be emptied. Oh well, no big deal. Her diaper soaked up her "accident" just fine, and she had plenty of diapers to spare. She just used her horn to grab all the necessary changing supplies. And to occupy herself while the change was being done, she decided to grab a special magazine she had just begun reading. It was one that specifically catered to big foals like her.

Little did Moondancer know she was going to be in for a shock upon seeing a very familiar (to her) pony on the magazine's cover.

Professor Pampers (Cheerilee)

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Author's Notes:

No tiebreaker was needed this time, Cheerilee had enough votes from previous rounds to edge out the competition. Scootabom1 proposed having Cheerilee be mentally regressed to all but babbling, and then playing pretend daycare/preschool. I decided to partially go with that idea, taking a page from the fic this is a continuation of. More specifically the Spike chapter where it was revealed at the end that Spike was only pretending to be mentally regressed.

There have been fewer and fewer votes in recent chapters, so I'm not sure how much longer I can keep this going if I don't get any more votes or ideas. I want to at least try to keep this fic going until either July or August of this year before wrapping it up. Whenever I do decide to end it, anyone will be free to pick up from where this might leave off. I've been specifically crafting something to give me an off ramp if needed.

But as long as I keep getting votes for eligible characters and get ideas to work with, I'll keep this fic going.

Characters previously voted on:
Lyra (with Bon Bon) - One and a half votes

"Good morning, Twily!" Princess Celestia cooed as she nudged her fellow alicorn awake, standing right beside the padded princess' bed with that big, motherly smile.

Twilight immediately reached out her hooves and hugged the sun princess, cooing back in a happy and playful tone. "Good morning, Mommy," She then used her horn to grab Smarty Pants, all the while asking the elder alicorn. "What are we going to do today?"

Celestia's smile grew brighter as she watched Twilight climb out of bed, proudly displaying that padded posture of hers. Even with how long it had been since they'd started this mother/daughter roleplaying, the warm and fuzzy feelings had never faded. It helped that Twilight always looked so cute in her diapers no matter what she did. She then said to the younger princess. "You'll see soon enough, Twily." Then she lit up her horn and pulled her fellow alicorn close.

A blush formed on the padded princess' face as she was subjected to an abrupt and unannounced diaper inspection. "I didn't have an accident, Mommy."

"I'm just making sure, Twily," Princess Celestia said with a knowing wink. "Foals don't always know when they go pee pee or poo poo. And what kind of mommy would I be if I let you get a rash?" She ended the diaper check a moment later, playful patting the padding. "Just as I thought, you're all nice and clean. Good job, Twily."

Twilight beamed with exaggerated pride. "I'm just doing my best to make you happy, Mommy."

The sun princess nodded. "You make me happy no matter what you do, Twily. Whether you use your diapers or the potty, I will always love you just for being you. And I mean that sincerely. Whatever makes you feel happy and safe makes me feel happy." It was possible to detect the faintest hint of worry creeping into her tone of voice, as if she feared that Twilight was perhaps becoming a little too attached.

The padded alicorn smiled back. "I know, Mommy. I know," Then she looked around the room, only for her eyes to notice no sign of anypony besides her and Princess Celestia. That prompted her to ask. "Where's my next playmate, Mommy? You've always brought one with you," She let out a gasp! "Wait a minute, are you going to be my playmate today, Mommy? Just like my other mommy was?"

Celestia snickered and snorted with a goofy grin plastered on her face. "Oh Twily, as much as I would love to join in on the fun with you, I can't. Who would I ever get to watch over you if I stopped being your mommy? The castle staff work hard enough as it is, I very well can't add foalcare to their list of already overwhelming responsibilities," Once she had regained her composure, she simply stated. "But I was able to find somepony willing to play with you. And don't worry, she's in diapers too. In fact, she's already waiting for you down at the dining room. Shall we go?"

Grasping Smarty Pants tightly between her hooves, Twilight gave a firm nod. And thus, with a flick of the horn from Princess Celestia, both alicorns were teleported away.

When Twilight and Princess Celestia arrived in the dining room a moment later, Twilight's eyes immediately fell upon a very familiar earth pony mare with a vivid reddish-pink coat sitting in one of the chairs at the table. She had pale, light grayish-pink locks, and her grayish-green eyes had that sort of far away look to them. And the cutie mark of three smiling flowers poking through the diaper left little doubt as to the mare's identity.

"Is that Cheerilee?!" Twilight let out a gasp! She was more surprised by how... infantile the earth pony seemed to be acting, given that she was pounding her hooves on the dining room table and appeared to be babbling incoherently. It was even possible to see a faint bit of drool coming out of her mouth.

Princess Celestia chuckled ever so softly, and put a hoof to her mouth to try to suppress the giggles. "No, Twily, that is Professor Pampers. That's what she insists on being called."

"Professor Pampers?" The padded princess blinked in surprise as she nevertheless made her way over to her new playmate.

When Cheerilee saw Twilight approach and heard the princess call her by her chosen nickname, the earth pony mare lifted a hoof up from the table and sat up absolutely straight. It was almost like she was coming out of a trance of some sort. "Yes, that's me," She giggled as she swished her tail. "I'm Professor Pampers! I have a PHD in diaperology!"

"Really?" Twilight blinked anew.

Cheerilee's giggles grew louder. "Of course not! Don't be silly! There's no such thing as diaperology! I just made that up because that's something a foal would say."

The padded alicorn was most surprised to hear Cheerilee talking normally, whereas a moment before she had been babbling and drooling.

The off-duty teacher seemed to sense what Twilight was thinking, for she explained. "I know what you must be thinking. I'm not mentally regressed. I still have my adult mind. But I'm trying my best to act more like a foal and less like an adult, hence why I'm calling myself Professor Pampers," She paused and poked at her padding with a hoof, delighting in how it crinkled and compressed. "I figured that if I'm going to teach classes on foalcare and on parenting, I should get some hooves on experience with the mindset of a foal. Studies have shown that it's very fascinating. And when Princess Celestia offered me a chance to study it personally... well, how could I refuse?"

"So you're just pretending to be a foal?" Smarty Pants suddenly spoke up.

Cheerilee nodded, greeting the stuffed animal. "Oh, hello there, Smarty Pants. I was wondering when Twily was gonna introduce me to you. And yes, I'm pretending to be a foal in both body and mind. I'm not very good at talking like a foal, though. So I'm mostly just going to babble and make noises. I'm here to learn, after all." Seconds after saying that, she went back to drooling and babbling, sounding rather convincing as she did so.

Princess Celestia came trotting over, explaining to Twilight. "I did offer her the chance to be mentally regressed, but she said it would be better if she stayed an adult and just pretended to be regressed. I know you'll teach her well, Twily. Just make sure you don't take advantage of that and get her into trouble," Her tone of voice took on a slightly sterner tone as she added. "Don't forget, I can punish you the way a mommy would if you act up."

Twilight shuddered, briefly remembering what had happened the last time she had experienced such punishment from the sun princess. The physical pain to her rump might have healed, but the memories still lingered in her mind. "I'll be good, Mommy," She firmly insisted. "And so will Smarty Pants. We won't do anything with Professor Pampers that we're not supposed to. Right, Smarty Pants?"

"Right, Twily," Smarty Pants replied. "We'll be the best behaved foals ever!"

The elder alicorn's smile returned as she clapped her hooves together in approval. "Good!" Then with a coo she declared. "So can I trust you to stay put and keep an eye on Professor Pampers while I fetch breakfast?"

Twilight firmly nodded. "Uh-huh." She proceeded to waddle over, sitting down in a seat next to Cheerilee and having Smarty Pants sit in the chair next to the alicorn.

Celestia, satisfied with the response, trotted out of the dining room and into the kitchen, soon disappearing from sight.

Now alone with Cheerilee, the padded princess watched as the earth pony mare pretending to be mentally regressed started putting a hoof into her mouth and sucking on it. Immediately, Twilight lit up her horn and pulled the hoof out, scolding her playmate. "Mommy says we're not allowed to suck on our hooves, especially not before eating. And Mommy is always right."

Cheerilee babbled and cooed, but seemed to understand what was being said. It was amazing how quickly she was getting "into character". It was almost as if she'd done it all before.

Princess Celestia returned a moment later, a tray of freshly baked pancakes being pulled along behind her with her magic. She proceeded to levitate over some bibs, fastening them around the necks of both big foals. Then she used her magic to put the pancakes onto two separate plates.

"Pancakes!" Cheerilee cheered as she raised her hooves into the air and licked her lips!

Twilight felt sorely tempted to reach out a hoof when one plate of pancakes was placed before her. The sweet smell sorely tempted her taste buds. It took all the willpower she had not to start drooling like Cheerilee was.

But Celestia pulled the plate away, as if sensing what Twilight was going to do. "Ah ah ah!" She playfully lectured. "You have to wait for Mommy to cut them up first." And that is exactly what she did: Using a fork and a knife to cut the pancakes into small, foal sized portions. They were full of syrup and warm butter that had been spread over them, which only made them seem even more irresistible.

As the padded princess waited patiently for the pancakes, she couldn't help but notice that next to Cheerilee's plate of pancakes was also a small bowl of oatmeal. That struck her as odd. Sensing that she would not get a straight answer from the earth pony mare, Twilight turned to Princess Celestia. But before she could ask a question, one of the cut up pieces of pancake was inserted into her mouth. The taste was so sweet that she forgot about everything else, and just concentrated on eating as many pieces of pancakes as were provided to her.

Cheerilee seemed to be much the same, content to let the sun princess feed her. Even so, she and Twilight both found that traces of syrup and pancake crumbs were getting all over their faces.

Princess Celestia wasn't bothered in the slightest by how messy her foals ate. She just waited until the last of the pancakes had been devoured, then levitated over a wet rag and started cleaning Twilight's face. "Those pancakes must've been really good if you made such a mess eating them." She playfully commented.

Twilight nodded back as her face was slowly cleaned. "Uh-huh. Pancakes are yummy!"

Meanwhile, Cheerilee seemed to get an idea. As she waited for her turn to have her face wiped clean, she reached out a hoof to grab her bowl of oatmeal. It had long since stopped being fresh and warm, but she didn't care. Instead of putting it into her mouth, the padded earth pony simply pulled back the seat of her diaper and poured the entire bowl's worth of oatmeal into her diaper. Then she leaned back in her chair and giggled as she squirmed about. "Heh heh, squishy!" And she pretended to gag, clearly intending for the oatmeal to be a substitute for something else.

Celestia playfully frowned when she witnessed the display. "Really, Professor Pampers? Did you have to do that now? Couldn't you have waited until we were done with breakfast?" She got up and trotted over, pretending to sniff the air. "Someone's a very stinky filly, it seems."

"Heh heh, stinky!" Cheerilee babbled and cooed as she wiggled about in her oatmeal filled diaper. Seconds later, she was levitated out of her chair as her diaper was pulled back for an inspection.

The sun princess kept up the act of treating Cheerilee's oatmeal prank as the equivalent of a messy diaper. "My goodness! You're almost as stinky as Twily! We'd better get you changed right away!" And she fanned a hoof across her nose in playful fashion.

Cheerilee, for her part, just cooed and clapped her hooves.

A small part of Twilight couldn't help but feel jealous when she watched the off-duty teacher be carried off by the sun princess. She looked down at her own diaper, noticing how pristine and clean it was. In that moment, something in her wished that she could've spilled something to make her diaper wet. Then she blinked in surprise at where that feeling had come from. "Why am I jealous?" She thought to herself. "It's all just an act, right? I'm not actually mad that Princess Celestia is treating Cheerilee as younger than me, right? She's always said I don't have to be the big filly if I don't want to be."

Unable to come up with a good answer, the padded princess just passed the time by turning her thoughts to other things: Wondering what sort of fun activities she and Cheerilee would have together after Cheerilee came back from having her "stinky" diaper changed.

Fortunately, Twilight didn't have long to wait. It hadn't even been five minutes before Princess Celestia returned, still carrying Cheerilee through the air even though the earth pony mare was now clad in a clearly spotless diaper. "Now what do you say to Twily for letting her borrow some of her diapers, Professor Pampers?" The alicorn mare with a majestic white coat asked as she set her charge down.

Cheerilee immediately looked Twilight in the eyes and in the best foalish sounding tone possible she said. "Thank you, Twily." Then she trotted over and gave her fellow padded pony a hug.

Celestia smiled and cooed with exaggerated praise. "Good job, Professor Pampers! It's always important to say thank you when somepony lets you borrow their things. And lucky for you, I always make sure to get the biggest, poofiest, most absorbent diapers possible for Twily."

Twilight blushed a bit. "I'm not that much of a stinker, am I, Mommy?"

The sun princess chuckled. "Maybe you are, just a little. But I'll love you no matter how stinky you are or how many of your stinky diapers I have to change. And I'm not just saying that because you sometimes use the potty."

"Thanks, Mommy," Twilight replied as she hugged her fellow alicorn tightly. "You're the best mommy ever! I mean it!"

"Mommy!" Cheerilee babbled as she eyed the taller alicorn mare. She seemed to be settling into her role very quickly and very easily.

Smarty Pants then questioned the alicorn mare with a majestic white coat. "So now that Twily and her playmate have had breakfast, what are we going to do next?"

"Something I think you'll agree is very fitting considering who Twily's playmate is." Celestia declared as she approached the padded mares, and teleported them away with her.

Upon returning to the bedroom that doubled as Twilight's secret nursery more or less, the padded alicorn was utterly astounded by the sight that greeted her eyes!

An entire corner of the room had been walled off by large guard rails, and the floor between the rails was covered with a soft, baby pink colored foam. Several cushions and pillows had been laid out in perfectly aligned rows, with some of them being sat upon by various stuffed animals. A small chalkboard of sorts was propped up against the wall, positioned so that it could be seen no matter how far away one sat. And just in front of the chalkboard was some kind of desk. To top it off, there were two unoccupied baby bouncers the same colors as the coats of both Twilight and Cheerilee, and they were set up right in front of the desk.

In short, it seemed that one corner of the bedroom had been turned into a classroom of some sort. The color of the baby bouncers left no doubt as to who their intended occupants could be. The only question left was who was going to be the "teacher"? It couldn't be Cheerilee. Or could it? Was Cheerilee going to give a pretend lecture about how to be a foal, and use Twilight as an example?

Princess Celestia quickly explained. "When I got Professor Pampers here," She briefly gestured to Cheerilee. "To be your next playmate, Twily, I started thinking: Since you're so smart, why not show it off? There are a lot of things you could demonstrate: You know your ABCs and how to count to ten. But then I started thinking about the things you don't know. And that got me to think that maybe you'd enjoy a day in class."

"So, Twily's going back to magic kindergarten?" Smarty Pants questioned.

At that, Twilight's pupils shrank and she gulped! "No! Not magic kindergarten!"

Celestia immediately moved to reassure the frightened alicorn. "It's not magic kindergarten, Twily. I know you don't have good memories of it. This is something more on your level: More like magic preschool."

The padded alicorn slowly came to her senses after hearing those words. "Oh thank goodness," And she pleaded. "Please don't ever make me go to magic kindergarten, Mommy! I'd rather stay with you."

The sun princess firmly vowed as she held tight to Twilight's hoof. "I promise, Twily. I'll never send you to magic kindergarten," She then calmly added. "You and Professor Pampers will be attending lessons for today."

"Yay! Preschool!" Cheerilee cheered again, before rushing over to the guard rails. But she stopped upon reaching them, rather than climb over them even though she could easily do so.

Twilight trotted over, eyeing her fellow padded pony. "What's wrong?" She asked.

Cheerilee babbled and promptly plopped down onto her poofy, padded posture. "Too high." She gestured to the guard rails, as if they were taller than they actually were.

The padded princess shook her head from side to side as she got an idea. "Nu-uh, not too high," She proceeded to try to lift the off-duty teacher from behind in order to boost her over the guard rails and into the classroom. "You can make it."

The diapered off-duty teacher, with help from Twilight, managed to clumsily straddle the guard rails. She landed on the classroom side as her diaper crinkled and compressed, cushioning the blow. From there, she scooted across the floor until she reached the bouncer with the same color as her coat. She managed to climb into it all by herself, taking great pride in her accomplishment! "Hooray!" She cheered, and started bouncing to her heart's content.

As for Twilight, she first boosted Smarty Pants over the guard rails, before climbing over them herself. She carefully levitated Smarty Pants into one of the empty seats immediately behind the baby bouncer. Then she waddled towards the baby bouncer reserved for her, and climbed into it. It felt so... surreal, even considering all the other things she had said and done as a foal. It really helped her to feel little.

Princess Celestia appeared at the desk near the chalkboard a moment later with a flick of her horn. She smiled, watching her charges bounce up and down repeatedly in their bouncers. They were clearly having the time of their lives, which is exactly what she wanted to see.

Even so, magic preschool was magic preschool. So the sun princess gently tapped a ruler against her desk, drawing the attention of all her "students". "Okay, everypony, please settle down," She spoke in her best teacher voice. "It's time for magic preschool to begin," Using her magic, she picked up a piece of chalk and wrote her name across the chalkboard. "I'm going to be your teacher: Miss Celestia. Now let me explain a few rules:" Beneath her name, she scribbled out a few numbers in chalk, then pointed to each one. "Rule number one: No disrupting the teacher while she's speaking. If you need to ask something, please raise your hoof."

Twilight and Cheerilee slowly ceased in their bouncing, eyes fixated on the alicorn with a majestic white coat.

Celestia continued, pointing to the second number. "Rule number two: Students are to remain in the classroom at all times, no exceptions. If you need to leave, you must ask a teacher to go with you," Then she pointed to the third and final number. "And finally, rule number three: Students must be on their best behavior while class is in session. Any student who disobeys will be sent to the time out corner." She gestured a hoof to a rather large stool at the opposite end of the makeshift classroom. True, there wasn't anything like a dunce cap or a paddle next to it. But the stool alone conjured up imagery intended to command obedience.

Satisfied with the lack of a response from her "students", the sun princess erased everything she had written on the chalkboard and cleared her throat. "Now then, let us begin today's lessons. We'll start with the alphabet, then numbers, and then colors," She proceeded to draw a large letter "A" on the chalkboard. "This is the letter A. It is the first letter of our alphabet, and the last letter in the word Equestria. A is for apple."

Slowly but surely, the elder alicorn guided both Twilight and Cheerilee through the alphabet letter by letter. She took the time to explain anything that might confuse her students. Then, at last, she reached the letter z, and drew a large "Z" on the chalkboard. "This is the letter Z, as in zebra. It is the last letter of our alphabet," After pausing for a moment, she proceeded to bring out some comically large alphabet blocks. "Now, here is a way to see if you all can remember what I've taught you," She levitated the blocks over to the big foals, and brought a small hourglass timer as she explained. "How many words can you make, and how many letters can you use before all the sand in this hourglass moves from the top half to the bottom half?"

Twilight felt confident in her abilities. But looking across to Cheerilee, she could see the diapered earth pony seemed more interested in stacking the blocks and building shapes with them rather than use them to spell words.

Looking back to Smarty Pants, Twilight seemed to get an idea in her head. After all, this wasn't really a contest. And it wouldn't be fair to take advantage of what she knew. If Cheerilee was having fun just the way she was, the padded princess decided she would join in.

"Are you ready?! Go!" Princess Celestia declared, and turned the timer over. Sand slowly began to pour from the top half into the bottom half. Then she stood by the chalkboard, ready to keep score.

Cheerilee quickly began arranging her blocks into a small tower, struggling to build it up at all before the uneven motion of her bouncing caused them to fall. Undeterred, she just picked them up and started building with them again, this time trying to make a small triangle with them.

As for Twilight, she was stacking blocks end to end with no rhyme or reason. She had no thought whatsoever as to what she should do with them.

The sun princess watched the infantile display from the big foals with that motherly smile of hers. "Cheerilee is learning a lot from Twilight. Or maybe it's the other way around," She thought to herself. "This is working out even better than I expected it to be. Maybe this is what Twilight's really needed, somepony on her level." Sure, there was still that lingering concern from the talk she'd had with Luna. It probably would never fully go away. But for now at least, it didn't seem to be a problem. And Luna had yet to say anything further about the state of Twilight's mental state.

At last, the final grains of sand reached the bottom of the hourglass timer. The "test" was over. Celestia took one look at the chalkboard, and found that neither Twilight or Cheerilee had managed to spell a single word with their blocks. She pretended to be disappointed as she shook her head. "Well, I guess we'll just have to come back to this lesson later." She declared and erased everything on the board again.

Cheerilee wasn't the least bit concerned about having failed the "lesson". She just kept stacking and re-stacking the blocks until they were taken away from her, at which point she occupied herself by using a free hoof to poke at her padding. She was in such a carefree state that she either didn't notice or didn't care that she was drooling again.

Twilight was only slightly better. She was silent, concentrating on using her magic to carefully position her alphabet blocks as best she could. Yet as she was in the middle of stacking them, hoping to build the biggest block tower yet, they were snatched away from her by the glow of Princess Celestia's horn.

"Alright, my little ponies," The alicorn mare with a majestic white coat declared. "That's enough for now. Playtime can wait. Now is the time for learning," Setting the blocks aside, she began drawing new symbols on the chalkboard. "Let's move on to numbers, shall we? Then we'll move on to colors, and then if there's time we'll come back to letters."

Just then, however, there came a knock at the bedroom door. It was all the way on the other side of the room, but it was still possible to hear the knock.

Princess Celestia seemed to briefly become worried if the look upon her face was any indication. But it faded just as quickly as it had appeared as she stood up and straightened her posture. "Better see what this is about," She then instructed to Twilight and Cheerilee. "Both of you stay here. I doubt you'd want anypony to see you like this. I'm sure this won't take long." She then teleported out of the classroom. After taking a moment to compose herself, she headed to the door to answer it.

Mere seconds after the sun princess had gone to the door, however, Twilight ceased in her bouncing as she felt a familiar twinge in her bladder. It was faint, but it wasn't going to stay that way for long. Her eyes drifted off into the distance, eyeing the bathroom. Just her luck that it was practically on the other end of the room, near the door. If she tried to make a break for it, she was sure to be spotted. She thought about trying to teleport to it. But then she hesitated as she remembered Princess Celestia's earlier instructions.

Cheerilee seemed to sense what the padded alicorn was thinking and feeling. For she ceased in her bouncing and leaned across to Twilight, asking her point blank. "What's wrong, Twily?"

Twilight bit her lip. "I... I have to..." She stammered as a single bead of sweat trickled down her face. The urge to go was strong. She'd never really paid it much attention before, but now it seemed intent on reminding her of its presence. "But Mommy told us we couldn't go anywhere without her. And if I try to teleport, somepony might see me. Somepony I don't want to see me in diapers."

The padded earth pony mare blinked slowly, before leaning closer and whispering to Twilight. "Well, actually, studies have shown that a diaper is more sanitary than the potty, provided the diaper is changed soon after being used. Plus, with diapers, you don't have to worry about stopping whatever you're doing. You just go when you have to go. I'm sure Mommy will understand."

Satisfied with the logic, Twilight took a deep breath and sighed. She leaned back in her bouncer, relaxed, and stopped trying to fight back. Her bladder soon relieved itself, as a steady hissing sound could be heard. Her diaper slowly but surely swelled up as a damp patch formed, growing bigger by the second. In a matter of seconds, it was all over. The damp patch slowly faded and dimmed as the diaper soaked up the accident no problem.

"There. Doesn't that feel better?" Cheerilee asked in a sympathetic tone of voice. "Your diaper handled the job no problem."

Princess Celestia reappeared in the classroom a moment later. "Alright, students," She declared in her best teacher voice. "Sorry that took so long. But I'm back, so now we can-"

But Twilight interrupted, raising a hoof. "-Mommy?"

"Yes, Twily?" Celestia asked, suspecting nothing.

The padded princess struggled to hold back the tears as she confessed. "I... had an accident. I tried not to, really, I did."

The sun princess quickly trotted over, inspecting Twilight's diaper and finding it rather soaked. She was quick to scoop Twilight into her hooves, lifting her out of the bouncer. "Oh, it's okay, Twily. If you have to go, you have to go. It's not healthy to hold it in. Come on, let's get you changed," Turning to Cheerilee, she said to the earth pony. "How about you, Professor Pampers? Do you need a change too?"

Cheerilee shook her head from side to side. "Nu-uh. I good." And she proudly presented her pristine padding to the princess. A close inspection revealed that it was indeed still spotless: No wet patches or bulges, no smelly smells.

Celestia made sure to pat the diapered earth pony mare on the forehead, showering her with exaggerated praise. "Good job, Professor Pampers! No wonder you have a PHD in diaperology! Maybe you could give Twily lessons sometimes." Then she levitated Twilight into the air, carrying her across the room to get changed.

Cheerilee watched the princesses from afar, smiling and admiring the bond they shared through their roles of mommy and daughter. It reminded her a lot of the love and affection her parents had shown her throughout her life. They had allowed her to enjoy her foalhood to the fullest extent: Weaning her off from bottles and breastfeeding, getting her out of diapers, and accomplishing all the major foalhood milestones at a reasonable age. She had been right in the middle of her peers on such issues, and even after discovering her love of teaching as a filly she had still found time for fun and games.

It was easy to see why someponies might like to return to a more carefree and innocent time. This experience was certainly giving the earth pony mare a lot to talk about when next she held a class on foals and on foalcare.

Celestia quickly changed Twilight's diaper, and then brought her back to the classroom. Much to her surprise, a hoof was raised by none other than Smarty Pants. "What is it, Smarty Pants?" She asked the doll (despite knowing who was really speaking through it).

"Could I join in the classroom too? I want to be with Twily and Professor Pampers, and go to school." Smarty Pants pleaded.

The sun princess smiled and nodded. "Of course you can join, Smarty Pants. There's always room for more. Thank you for asking the right way," She then cleared her throat, drawing the attention of her other students. "Class, we have a new student joining us," Using her magic, she brought forth the old doll and said. "This is Smarty Pants. She's here to learn just like the rest of us," Then she encouraged. "Say hello, Smarty Pants."

"Hello, everypony." Smarty Pants sheepishly greeted.

Twilight giggled and waved a hoof. "Hi, Smarty Pants! I'm glad you're here. Things are always more fun with you around."

Cheerilee also giggled, watching as Smarty Pants was placed at an empty desk to the right of Twilight's bouncer.

Princess Celestia waited for a moment, before clearing her throat again. "Now then, everypony, let's get back to today's lesson. Shall we?"

The rest of the day was a fun filled blur to Cheerilee, even to the point where she had an actual accident in which she messed herself. It had only partially been intentional to see what it felt like, and the smell alone was enough to make her regard it as something she would never do again no matter what.

When at last the day ended and Twilight went to bed for the night, Cheerilee was sad to see it all end. Even so, she was glad to get out of diapers.

Next morning, Cheerilee slept later than usual. She'd accumuliated so much earned time off that nopony, least of all the EEA, had batted an eye when the earth pony mare had decided to use some of it. She still had at least today off, which gave her a chance to reflect on everything that had happened.

Next time, perhaps she would take up Princess Celestia's request to be fully mentally regressed, instead of merely trying to act like it.

When at least Cheerilee did wake up, she was surprised to discover a letter addressed to her sitting on a desk near her bed. Being naturally quite curious, she picked it up and examined it. The letter read as follows:

Dear Cheerilee,

I probably don't need to do this, but I want to thank you again for agreeing to be Twilight's playmate. And I know I can trust you to keep this a secret from ponies who aren't in the know.

From one teacher to another, I have nothing but respect for the sense of loyalty and affection you inspire in your students. And I see a similar bond reflected between Twilight and myself since we've started these mother/daughter playtime sessions.

I know I don't need to reward you, especially not since you've still got a lot of saved days off ready for use in any emergency. Even so, I hope you'll at least consider the offer to be a guest teacher at my school someday. You strike me as an excellent pony to help teach about earth pony magic and cutie mark magic to ponies who aren't familiar with such subjects.

Sincerely,

Princess Celestia

At that, the earth pony mare felt her heart figuratively skip a beat. Being invited to teach at a prestigious school like Celestia's School for Gifted Unicorns would be a very high honor indeed.

Well, that offer would have to wait a while. Right now, Cheerilee wanted to make use of her newfound insights into foals and foalcare while the experience was still fresh in her mind. "I wonder if maybe I should lean into my Professor Pampers persona for such classes," She thought to herself. "After all, ponies always learn best through direct experience. And many of the ponies who most need a lesson in foals and foalcare are a lot older than my usual students."

The Baby Twily and Mommy Celestia Chronicles

by SuperPinkBrony12

Little Lulu (Princess Luna)

B.B.B.F.F. (Shining Armor)

Octy and Vinyl (Octavia and Vinyl Scratch/DJ-PON-3)

Big Sis Velvet (Twilight Velvet)

Spity (Spitfire)

Dusty (Lightning Dust)

Maud (Maud Pie)

Moonie (Moondancer)

Professor Pampers (Cheerilee)