During the day, with Daring out on the adventure, Rainbow's friends had decided that the best thing to do was have a fun pajama party at Twilight's library. It had all the essentials like snacks and drinks, and they even let Spike join in on the fun. Applejack had brought some applesauce for the little foal in their group. And Pinkie somehow had made a formula that tasted like soda. The group also included the Crusaders.
After they all got dressed, the group were all resting on the large carpet, sleeping bags scattered around it. "How about truth or dare?" Twilight offered, not noticing Applejack and Rarity wince.
Rainbow giggled and looked at sweetie. "Twuth or dawe, Sweetie Bewwe!"
"Uh.." Sweetie Belle thought for a moment "Truth?"
Rainbow giggled and asked as loud as she could. "Who you wike, Sweetie Bewwe?"
"What do you mean? Sweetie asked, tilting her head.
"Who, you wanna have as a special somepony." Apple Bloom explained.
"Uh , I don’t know.” Sweetie blushed, trying to think.
"I don't know, you keep looking at Rumble when he’s around." Scootaloo suggested.
Sweetie shook her head. "No I don't!" She yelled with a bright red blush.
"I guess you could say your heart flutters." Scootalo teased.
"Now girls, don't ya go teasin’." Applejack scolded, shaking her head.
Rainbow giggled and then looked at Sweetie Belle. "It ya turn."
Sweetie looked toward Scootaloo with a smirk. "Okay, Scootaloo, truth or dare?" She rubbed her hooves together.
Scootaloo thought about it before responding moments later, "I'm always up for a good... Dare!"
Sweetie Belle giggled and was quick to come up with something. She looked down at Rainbow and her crinkly bottom. A devious idea came to her. "Oh, I know, I dare you to wear a diaper for the night!"
Scootaloo looked at Sweetie Belle for a second, she blinked. "I would do that... But how would a diaper fit onto me? I mean look at how small Rainbow's diapers are."
"Oh, oh," PInkie bounced up. "I'll get one! Wait right here!" Before anyone could really ask, Pinkie darted off out of sight, soon zipping back with a proper sized, thick, white diaper. "How's this?"
Scootaloo blushed and said quietly. "Uh, what if I have to... Use the bathroom?"
"Well I guess you'd need a change then," PInkie joked, watching Scootaloo blush. “But you’re not a bed wetter, right?”
Twilight blinked. "Pinkie, she shouldn't be forced into that. Don’t take away her bathroom privileges."
Sweetie looked at Twilight and said in a calm tone. "Well, it was a dare, Twilight. She has to use it. She can’t take it off until morning."
"Ew, that’s gross!" Scootaloo gagged, sticking her tongue out. “I haven’t worn a diaper since I was three!”
Rainbow giggled. "Yeah, it can be," She blushed. “And you no can changiee youwself.”
"Well, it was a dare, so you can't say no," Sweetie replied with a giggle. “Unless you wanna forfeit the game.”
Pinkie poked Scootaloo. "Come on, it'll be fun. Do it for Rainbow Dash,” Then she asked. “Need any help with it?"
Scootaloo sighed. "Just change me into it like you would a baby, kind of like you do with the Cake Twins."
"Well how else would you change a baby?" Pinkie asked with a faint snicker as she laid Scootaloo down. She pulled the pants bottoms off Scootaloo's pajamas and unfolded the square.
"Pinkie, where you even get that diaper?" Scootaloo questioned.
"Discord. " Pinkie answered, as she pulled the filly's tail through the hole in the back and even powdered the filly a bit
"Wait, Discord? Did he, like do something to it? Like make it so if you wear it, you can't control when you go or something?" Scootaloo asked, while looking up at the pink coated party pony.
"I don’t know, but I don’t think he’d do something like that," Pinkie answered, soon taping it up all nice and snug. "Oh, it fits you perfectly, Crinkleloo." She booped Scootaloo’s nose as Rainbow giggled.
"Hehe, Scootawoo need potty training." Rainbow teased.
Scootaloo blushed. “Shut up, I do not! You’re not even close to being potty trained yet, Daring won’t let you try,” Then she looked at Sweetie Belle. Can I at least put my pjs on over this thing?"
"Hehe, sure but it won’t hide it much." Sweetie teased, watching Sootaloo pull her pajamas back on. However the bulge from the diaper was quite visible.
Fluttershy smiled. "Aww, it looks cute," She remarked. “You’re such a cute baby, Scootaloo. You and Rainbow Dash could practically be sisters.”
Scootaloo blushed and sat back down. "So, is it my turn now?" She asked.
Rainbow hugged Scootaloo. "Yeah, your turn."
A few hours passed by and everyone was fast asleep. Well, except for Scootaloo. She hadn't been able to sleep all night for one simple fact, she had to go pee. Normally the filly would just have gone to the bathroom, but right now was different because she had a diaper on. Even knowing that she’d been dared to keep it on all night, she was already conflicted about going in her diaper, despite knowing nopony would be around to see her doing it. "I could just take it off and go to the bathroom,” She thought. “But I don't want Sweetie Belle or Apple Bloom to wake up and see me without it on, cause who knows what they would do. They might glue the tapes shut or something!"
Scootaloo gulped. "I'm not getting any sleep having to go though. I could just use my diap- no! I will not do that! Though it might be the only thing I can do. I don’t know if I can take it off, or put it back on."
While squeezing her legs together, the filly saw Rainbow snoozing up against Fluttershy's side. In the quiet, the filly could hear the foal hissing as she tinkled into her diaper. Which just reminded Scootaloo that she needed to go even more.
Scootaloo sighed, there was only really one thing she could do, and that was using her diaper. She doubted she could hold it in for much longer, and they always said holding it in wasn’t healthy. She applied some pressure to her bladder, which was just about ready to cave in on its own, and started to pee. Soon all she could feel was the warm, damp sensation by her crotch.
The tomboyish pegasus blushed, wincing at the sound until it stopped. Fortunately, it seemed her little wetting had gone unnoticed. She crawled back into her sleeping bag, wiggling and trying to calm down.
Oddly, her hoof moved to her mouth as she closed her eyes. And as she fell asleep, her hoof entered her mouth and she started to suckle on it almost on instinct.
Scootaloo awoke the next morning to see Rainbow giggling as the foal looked into her eyes. "Hehe, why you suckwing youw hoof, Scootawoo? I thought you not a baby."
Scootaloo blushed and stopped suckling her hoof. "I wasn't sucking on my hoof! You were seeing things!"
"Yes you were! I saw ya!" Rainbow snickered, watching as Sweetie Belle come over.
"Do we need to check her diaper, Rainbow? Maybe she'll graduate to pull ups?" Sweetie teased with a snicker.
Rarity came over, shaking her head. "Now Sweetie Belle, teasing isn't nice. You wouldn't be laughing if you were put into diapers. Perhaps I should do that if you’re going to keep teasing Scootaloo, then you can see how you like it."
Sweetie eeped and shook her head. “No, Rarity, I’ll be good! I don’t wanna wear a diaper!”
Feeling the cold, squishy material underneath her bottom, Scootaloo nervously answered. "Why would you need to check me? It’s not like I’ve wet myself."
Rainbow hugged her sister. "Is okay if ya did. Tats why you gotta a diapee on." She sniffed, smelling pee. Rainbow herself had already been changed.
Scootaloo looked at the filly and blushed a little. "I know, Rainbow Dash, but I'm telling you I didn't."
Rainbow tried using her little hooves to move the sleeping bag open. "I wanna see!" Scootaloo blushed, picking up the foal and moving her away from the sleeping bag. "Hey!" Rainbow protested even as Sweetie Belle tugged on it. "Come on, show us."
"Why? I told you I didn't wet myself, so why should I show you?" Scootaloo answered while trying not to blush and give herself away.
"Then why you smeww wike pee pee?" Rainbow asked with another giggle.
"No I don't! You do, Rainbow!" Scootaloo blushed.
Pinkie walked over with a grin. "No she doesn’t, I just changed her. And boy was she soaked." It took Scootaloo a second to realize that most of the eyes in the room were looking at her now.
Scootaloo blushed and tried to hide, she was embarrassed. But unfortunately, she could see that her friends also weren’t going to be satisfied without an answer. They’d probably find out one way or another. "Alright, fine!" She shouted. "I might have maybe..... Peed myself." She said the last part very quietly.
Sweetie took a hold the side of the sleeping bag and pulled it open, soon revealing said used diaper.Despite what Scootalo expected, no one laughed except maybe a little snicker form Sweetie.
Rainbow rushed to the filly’s side and hugged Scootaloo neck. "Hehe, is okay, sissy."
Scootaloo blushed but hugged Rainbow back. "So you're not mad at me?"
Pinkie shook her head. "Of course she’s not, silly. Though I do think you need a change."
Scootaloo blushed. "Yeah, I guess. But I do kinda need to use the restroom again, and I need some help getting my diaper off..." She admitted.
Pinkie took Scootaloo’s hoof, leading her along the bathroom like a child in potty training.
Rainbow giggled a little more even if she was a little bit jealous Scootaloo was allowed to use the bathroom and she wasn’t. "Twily, you best fwiend eve!" She hugged her leg while the princess gently patted her head. "I hope Dawing come back soon."
Twilight smiled. "I'm sure she will, sweetie. She could be back any minute now knowing her!"
Fluttershy sat next to Rainbow as the group made its way to the kitchen (Pinkie and Scootaloo joining them a little later). "At least you won't have to grow up all over again, hopefully." She commented.
"Well, growing up again could be fun!" Pinkie suggested.
"At least she'd keep her cutie mark," Applebloom blurted out, before pouring syrup onto her pancakes.
"Yeah, I got the coowest cutie mark evaw!" Rainbow declared while looking at her plate of ripped up pancakes .
Fluttershy forked up the tiny slices to Rainbow. "I hope these are small enough for you." She said while staring at the tiny teeth.
Rainbow ate the pancakes and smiled. "Tese good. Tey yummy!"
Once breakfast was done with the mares began to go home, leaving Twilight to babysit Rainbow. Scootaloo stayed to hang out while they waited for Daring.
Rainbow held up a crayon drawing, showing a crude stick pony art of her and Scootaloo together. Then Rainbow giggled and looked at Scootaloo’s drawing. "Wah you dwawing, Scoots?"
"Oh, the Cutie Mark Crusaders’ treehouse," Scootalo declared, showing it off. "Your art is nice too." She was really enjoying this bonding time with Rainbow.
"I dwew you, me, and mama." Rainbow declared, holding her drawing up with a grin.
"Yeah, I can see that." Scootaloo ruffled Rainbow’s mane before going back to drawing.
As the two played, Spike wandered over, staring at each drawing. "So do you two need anything? Maybe a juice box?"
Rainbow nodded. "I wanna cookie!'
Spike nodded as he headed to the kitchen, but before he could fetch the items the drake heard a knock at the front door. "I'll get it!" He called out, Twilight being in the basement at the moment. Upon opening the door, he was greeted by Daring once more adorned in her Yearling outfit. "Oh hey come on in, did you get the stuff?" He asked.
Daring nodded. "Yeah, I also meet a tribe of ponies who, whenever they get too old, they drink this water to make themselves younger again." She held out a vial of the aforementioned water.
Spike led Daring inside watching as Rainbow let out a cute gasp and waddled over, giving Daring leg a hug. "Mommy!"
Daring smiled and picked up the foal. "Hi sweetie. Were you good while I was gone? You didn’t get into trouble?"
Rainbow nodded with glee and nuzzled into Daring’s fur. “Uh huh, me was good.” She giggled contently.
Daring smiled and hugged her 'daughter' back. "Well, I guess I'll have to get you something special for being such a good little filly, now won't I?"
“Yay, I wike tweats!” Rainbow happily squeaked.
As the two talked, Twilight game up the stairs and upon seeing Daring waved. “Oh good, you’re back,” She approached the adventurer. “Hope you got what we need. “ She watched the adventurer pull out the vials.
"I got two just in case." Daring declared as she hoofed the vials to Twilight.
“Great, I’ll get right to work on mixing up the cure!” Twilight beamed. Then taking the vials into her magic, the princess made her way to her lab once more.
As they waited Daring looked at Scootaloo. “So, are you going to miss having a little sister?” She playful joked.
Scootaloo blushed a little. "Kinda, but you know it’s just how things have to go. It was nice while it lasted."
“I guess whatever happens you don’t lose,” Daring commented. “If Rainbow stays a foal you keep a little sister, and if Rainbow changes back she’s your big sister”
Rainbow hugged into Scootaloo, thinking things over now that the two had grown closer.
Daring smiled. "Do you maybe want to come over to Rainbow's place for a little while, Scootaloo? It beats waiting around for Twilight."
“Sure, then you can show me all those cool photos!” Scootaloo beamed, fluttering her wings some before moving to get her helmet.
Daring smiled and pulled out the stroller for Rainbow. "Okay, follow me."
After a lift from Daring the young filly followed the other two pegasi into Rainbow’s house. “So me and the other Crusaders have this really great idea, doing the flag waving for the Equestria games.” Scootaloo explained, looking at all of Rainbow’s trophies.
"Oh really, I’d love to hear all about it." Daring commented as she unbuckled Rainbow from the stroller and quickly checked her diaper, she felt a light squish indicating a good soak.
Scootaloo smiled. “Well, Ponyville has three types of ponies.” She explained the idea to Daring as Rainbow was changed.
Rainbow clapped joyfully, especially once the diaper change was done. “Yeah, if me get changed back, I be suwe da win gowd for Ponyviwwe!“ She smiled.
"Well, Twilight should have you back to normal in about a day or two, and the games aren't for like a week or two, right?" Daring asked.
“Yeah, and Rainbow Dash’s going to be awesome!” Scootaloo said looking at the small bag of toys. “At least you made sure Rainbow never got bored.” She told Daring.
"Well, it's easy to entertain a foal." Daring smiled, grabbing a rattle to demonstrate and shaking it in front of Rainbow.
Despite her best efforts to not fall for it, the little foal began to giggle reaching out for it while on her back.
Scootaloo giggled. "You know, you’re right. And that gives me an idea."
It didn’t take long until Scootaloo and Dash were playing together, having chosen to play pirates with the sofa as their ship.
Daring, on the other hoof was continuing her writing. She had a lot to fit into her story now but she didn't know if ponies would like it. Would her viewers really believe there was an entire civilization of ponies who remained foals forever? That’s assuming they continued reading past things like her attempt to start potty training Rainbow Dash. The less said about that harrowing disaster, the better.
Rainbow sat on one of the cushions and yelled. "Fire da canons!" She then threw over some small stuffed animals.
Scootaloo threw a few more at targets they had set up. “Oh, they’re too strong!” The filly even wore an eye patch while Rainbow had a tiny hat.
Rainbow giggled and threw another toy at Scootaloo's position on the couch. "I gonna win!"
"Nu uh," Scootalo lined up a pillow and fired it at Rainbow! The tiny foal was smothered by the large pillow, but otherwise unharmed when she pulled it down. Scootaloo giggled. "Haha, direct hit!"
Rainbow giggled and threw the pillow off of her. "Hey! No fair!"
"Ar,r all fair with piracy," Scootalo teased. "Don't make me make ye walk the plank, matey."
Daring turned to watch a grin, plastered across her face as she did. She only vaguely remembered the days when the adventures she went on were solely in her imagination, and not real.
Rainbow was still a little mad at Scootaloo for throwing a giant pillow when she had been throwing toys, but Rainbow couldn't give up the chance to make Scootaloo “walk the plank”.
After a few toys were tossed, Scootalo got hit on the head by a plush teddy. She made a face and giggled, wobbling to the edge. "Oh no, I'm gonna fall in!”
Rainbow giggled and waddled over to the other couch. She went right in front of Scootaloo and giggled. "Bye bye!" She giggled and with all the strength she could muster up, she pushed her 'sister' onto the floor.
Scootaloo harmlessly fell to the cloud floor with a soft poof. She wiggled around. "Gah, splash splash! Argh, throw me a rope!" She played.
Rainbow looked on the couch but couldn't find a rope. No, all she could find was a toy snake. She lowered it down, letting Scootaloo grab on. The bigger filly stood up, climbing back onto the couch. "You saved me." She cheered before tickling Rainbow Dash.
Rainbow smiled and giggled some. "Me no wet you drown, sissy. Who gonna pway with me ten?"
"Well, maybe you two should take a nap," Daring offered as she turned again seeing the mess they had left behind. “My goodness, Rainbow. How did you not make such a mess when Twilight and the girls were watching you?”
Rainbow shook her head. "No nap, not tiwed!"
"Are you sure?" Daring asked while Scootaloo picked Rainbow up to cradle her.
Scootaloo looked at the baby and giggled. "Don't worry, Rainbow. It’s just a little nap. Everypony takes them."
Rainbow tried to resist the rocking. "Mmm, no tiwed." She protested.
Daring smiled as she looked at Scootaloo. "Her bassinet is in the first room on the right, next to my bed."
"Okay." Scootoo slipped the foal onto her back before heading up the stairs.
Rainbow curled up some, mumbling. "Mm., it my bed." She soon felt her big sister gently grab her, lowering her into the bassinet. The foal grabbed her Spitfire plushie, hugging it close on instinct.
"Aww, need a story or anything, Rainbow Dash?" Scootaloo asked while closing the curtains.
Rainbow nodded, "I wanna hear stowe!"
Scootaloo smiled making her way to the shelf to look. "Hmm,” She found the Daring Do book that was bookmarked and sat nearby, opening it up. “I guess I can read to you from wherever you left off. I think I've read this one before already."
Rainbow smiled and looked up at Scootaloo. "We was at... uh...Me fowgot."
Scootalo looked down at the book. "Daring Do had just snatched away the Staff of Lazzo from Cabaleron." She explained before starting to read.
As the story was read, Rainbow’s eyes drooped even more, unable to fight her fatigue. The foal began to drool a little, soon snoring soundly using her plushie as a pillow.
Scootaloo stopped reading as soon as she saw that Rainbow had fallen asleep, she then kissed the foal on the forehead and very slowly walked out of the room.
Daring looked toward the filly once she came back into the room, smiling. "See, getting her to sleep is the easy part," She joked before looking back at her work. "How are you coping with Rainbow as a foal? You really look up to her after all."
Scootaloo smiled. "I'm actually really liking it, she's always been like my sister, but now she actually thinks of me like her sister if you know what I mean."
"That's great to hear,” Daring commented. “You can help her learn to grow up again if things don't turn out." She couldn’t help but ruffle Scootaloo mane.
Scootaloo blushed. "Do you, do you think that Rainbow will actually have to grow up again?"
"Is it possible, but I'm sure the water can be reversed. I saw the effects of it myself. I just hope there are no side effects if it doesn't work." Daring commented.
Scootaloo thought for a minute. "What if the water doesn't get reversed, and it only makes Rainbow even younger?"
"I don't know, are the risks worth not trying?" Daring asked, although she was unsure how a filly of her age would be able to answer well enough. "I'm not sure she can get much younger.”
"Well, she could become a newborn,” Scootaloo giggled a little. "Thought Rainbow would be really cute as a newborn."
Daring cheeks reddened at the thought. At that age Rainbow would have to be nursed, although Daring was sure Windy would love to do that again. "I guess. I just fear she might lose her cutie mark or her mind would regress."
Scootaloo thought about it for a second. "Well, if she lost her cutie mark, she would at least be like any real foal, a blank flank. And if her mind regresses, well then she would be just a harmless little filly."
"But she'd lose all she is, I really don't want that on my shoulders." Daring shivered. "Mind magic is just freaky."
"Yeah? Well knowing Rainbow, she'd be back to her old self again by the time she's five." Scootaloo commented.
"Lets just hope she at least keeps most of her memories," Daring stared down at her paper. "Is is strange that I keep thinking of her as my daughter, even when she’s not?"
"Well, she seems to think of you as her mother even though you’re not." Scootaloo rubbed her neck.
"Well at least Windy is okay with sharing," Daring chuckled. "I guess we'll just have to wait and see. Want me to walk you home?"
Scootaloo blushed a little, "I was actually wondering if I could stay here tonight, my parents would be fine with it."
"Well, I don’t see why not. You can use Rainbow sleeping bag and we have plenty of pillows," Daring replied as she got upm giving another ruffle of the mane. "Should I call you squirt too?"
Scootaloo blushed. "Uh, I mean if you want to, Daring."
"Well, squirt, why not help me make dinner?" Daring asked, before heading to the kitchen with a smile.
Scootaloo happily nodded, following Daring and eager to see what would come.