Sweetie Belle was in a state of shock! She’d wet herself, but not the bed, just a diaper that was somehow on her flank. The filly knew that there was only one pony who could explain all of this. "Rarity! Please come here!" Sweetie Belle shouted for Rarity, who came immediately.
"What is it darling?!" Rarity asked. "Another nightmare?"
"A nghtmare is the last thing for me to worry about now, Rarity!" Sweetie explained, pointing directly to her diaper.
Rarity gasped upon seeing such a peculiar thing on Sweetie's flank. "Oh. what’s this, Sweetie?! I have no clue what could’ve possibly happened!" Rarity commented in the most unsuspecting tone.
"Rarity..." Sweetie sighed. It was obvious who could’ve put such a thing on her.
"It didn't sound convincing, did it?” Rarity asked, and Sweetie shook her head. With a sigh, Rarity confessed. “Okay, you aren't a silly filly anymore, let me explain, darling. Like a good, no, the best older sister of all time, I have to do the best to help my younger sister. And like a fashionista, I have to say that I dont like it a bit to clean the sheets of your bed. Not after all the work I already have to get done in the span of a day. So I thought to myself ‘What can I do to solve both problems at once?’, that's when I remembered how I’d told you about me having accidents while still a filly. And before you ask, yes, I had to wear diapers at night. Something I’m still embarrassed by.”
“Oh you did?” Sweetie asked with surprise. “Mom and Dad said you were out of diapers by the time you were three.”
“Yes,” Rarity nodded. “Altough I never actually used them, just the thought of using a diaper was enough for me to be able to control myself, and that put a stop to my nighttime accidents. But you know what, Sweetie Belle, lots of ponies use diapers as a way to solve nighttime accidents. And that means bigger diapers are inevitably made, the bigger they are, the more they absorb.”
“I didn't even think about that...” Sweetie gasped, as a new world opened up for her.
“And you wanna know what else, Sweetie Belle?” Rarity added, though she hesitated for a moment. “There are even little ponies who have the misfortune of not being able to use the bathroom anymore, so… you can guess what that means.”
“Rarity, that’s really sad,” Sweetie commented. “How do they live with that sort of thing?”
“Support from friends and family of course,” Rarity assured her little sister. “And the same will happen for you, even though this is just a nightly thing.”
Sweetie frowned. “I doubt it.” She glumly remarked.
“You will learn someday, Sweetie.” Rarity insisted.
“Okay, but how did I end up in a diaper, Rarity?” Sweetie asked, even though she was certain she knew the answer. “I didn’t put one on before bed.”
Rarity answered. “Remember when I said I was a filly, and I didn’t need those diapers?” When her sister nodded, Rarity explained. “So as not to waste the bits our parents spent buying them, I saved them until now in case something like what happened yesterday happened. I carefully put it on you while you were in a very deep slape, just in case. So you don’t have to worry about more accidents, just like I promised you. And I must say, it fits perfectly on you, Sweetie Belle!"
"That explains why I was feeling something fluffy while bouncing on the pillows!" Sweetie thought to herself, but she was too ashamed to admit it and so she simply said. "But Rarity! I’m not just wearing a diaper, I’ve wet it too! It's the second night now I’ve had an accident!" She complained, on the verge of tears.
Rarity eyed the diaper, taking notice of its condition. Sure enough, Sweetie Belle's diaper was wet. But Rarity hadn’t thought it would really happen. She just thought that if she diapered her sister, the same thing that happened to herself would happen to Sweetie. What could she do now? Her little sister was having nightly accidents, just like Rarity herself in the past. And apparently, diapering her hadn’t stopped them. "Sweetie Belle loves to play with her friends, the Cutie Mark Crusaders," Rarity thought. "But since she's having nighttime accidents, does that mean she can't go to or invite her friends over for sleepovers like she wants to do?” But Rarity quickly shook her head. “No! I will take care of that matter, and quickly! No way is my little sister’s condition going to stop her from having sleepovers with her friends!"
Since Sweetie Belle was about to cry, Rarity didn't waste anymore time and she spoke in a comforting tone. "Sweetie Belle, my dear sister, I know that this is something very strange, confusing, and even humiliating for you. To be in a diaper, and for it to be wet. But I can say to you not to worry. Because in life things like this can happen, good things, bad things, things that will make you smile like Pinkie does, and others that will upset you for a day, or perhaps longer. But know this, Sweetie Belle, using a diaper for its intended purpose may not be as bad as you think it is. After all, nopony saw you use your current one, am I right?" Rarity waited for her sister to nod, then as she stroked her little sister’s mane she added. “And I will not think badly of you for not making it to the bathroom in time, Sweetie, I can guarantee you that."
"Rarity…” Sweetie spoke, pausing for a moment. “You always know how to cheer me up!" Hurrying to hug Rarity tight.
"You... are... welcome!" Rarity said, almost losing her breath. Then when the hug ceased, Rarity added. "I will schedule a day with Doctor Stable to see if anything can be done to stop these nightly accidents, so we both can finally sleep well at night. How does that sound?"
"Fine by me!" Sweetie nodded.
"And what if I diaper you every night until the appointment?" Rarity asked.
"Not fine!" Sweetie protested, folding her hooves in a pout.
"Oh come on, Sweetie Belle, darling,” Rarity replied. “It's just until we go to the doctor. He has various ponies to tend to everyday, so we won’t get an early date. But what if I change your diapers if you use them in the mean time? Would you feel more secure if I do that?
"Well... if you changed me, I wouldn't feel so scared and upset about the diapers anymore…” Sweetie began. Then a thought came to her. “But will you change me even if I..."
"DON'T EVEN THINK OF THAT!" Rarity shouted, interrupting Sweetie, who giggled a bit at Rarity’s reaction. "Although your problem is just wetting the bed, not... the other thing.”
"Oh!” Sweetie realized with a giggle. “Thank you, Rarity. I feel much better now!"
"That's what sisters are for!" Rarity said in a reassuring tone.
It was then that Sweetie remembered, she was in need of a change. "Err, Rarity? Can you please... change me?" She asked, her face becoming red like a tomato.
"Oh of course. I’d almost forgotten!" Rarity said, giggling at her forgetfulness. Gently carrying her little sister to her bedroom, Rarity took some of her sewing things from above a small wardrobe, and put them in another place.
When Rarity had finished doing so Sweetie Belle gasped at a sudden realization. "Rarity! I always visit your room, and yet I never realized that this was my childhood changing table!"
"Well, Sweetie,” Rarity confessed. “Once you started to use the potty, the changing table became useless. So, to not waste a perfect place to put things on, I decided to stay with it."
"That’s err… incredible!" Sweetie said as the common object somehow gave nostalgia to the little filly. She was caught by surprise at some of the memories that came to her mind.
"Sweetie Belle! Come back here, now!" Rarity shouted to the younger Sweetie Belle, who just giggled as she ran away from Rarity. "Sweetie Belle! I know you want to play, but you're wet! You don't wanna get a rash, do you?”
Sweetie Belle almost immediately stood still after Rarity had spoken. "No Rawity! Rashes huwt a wot!" Baby Sweetie commented. It was well know that the filly was afraid of rashes (even more so than the monsters under her bed or in her closet).
Rarity playfully laughed. “I know you’re afraid of rashes, Sweetie Belle. So come up here and I will get you into a nice, clean diaper, so we can play for longer. What do you think of that?” The young fashionista to be suggested.
"Yay!" Sweetie cheered in delight.
"I'll take that as a yes." Rarity smiled, happy with her little sister for cooperating. Sweetie Belle then sat down on the floor and raised her hooves in the air, meaning that she wanted Rarity to pick her up, which just made Rarity impressed with how cute her little sister was. Not wasting more time, Rarity picked her up and led her to the changing table, placing her down with care. Once there, Rarity began the changing process. As a baby, Sweetie Belle was always giggly, cute, and playful, and that always made difficult for Rarity to change Sweetie’s diapers. But Sweetie didn't realize this, she just wanted to play and that meant shaking all her little hooves whenever her diaper was changed. But Rarity never stopped loving Sweetie Belle, she was so innocent in these days. Maybe that part of her was still present nowadays.
When little Sweetie was finally changed by her helpful sister, Rarity, that Sweetie Belle was glad she had such a helpful big sister. And one that would play with her all the time.
"Done bony!” Rarity suddenly shouted, such a phrase Sweetie always loved whenever Rarity said it.
“YAY!” Sweetie clapped and giggled.
“Ready to play catch?” Rarity asked. “I’m about to get ya!”
Sweetie just giggled, as she was fast enough to not be caught by Rarity in their little fun time.