Sweetie Belle finds herself placed back atop her sister's back, although she'd more than capable of walking herself now, a lot of the fullness of her meal has been alleviated with the emptiness of her bowels. But she didn't complain, she always did enjoy riding on her sister's back, it was just fun, and it was when they were often the closest, even if Sweetie Belle wouldn't be seeing much she cared for, at least she was doing it with her sister. "Alright." Sweetie Belle responds.

Sweetie Belle can't help but scrunch her nose at the overwhelming scents of perfume and candles of their first destination. She didn't know how Rarity could stand it, of course Sweetie Belle can only blush slightly, thanking the ponies for their compliments, but not thinking she deserved them at all, she was just her normal self, she wasn't trying to be cute or anything!

Once they departed from the the realm of too much strong scents, the toy store they were now in was far more her speed. "Oohh." Sweetie said as she let her hooves carry her, stumbling just a little bit as she hadn't quite expected to be set down, but she didn't fall. "I'm okay." She stated almost instantly. Her eyes wandered about all the plush creatures, she had no idea if she was too old for stuffed animals or not, she didn't really know many fillies her age who had them, but she didn't care, they were cute, and soft, and she liked having them!

Rarity chuckles happily as she sees Sweetie Belle perk up at the sight of the stuffed animals. She knew all too well that her sister was fond of such things, even though she also knew that someponies would say she was too old for them and it would be better for her potty training chances to distance herself from such foalish things. However, Rarity found both arguments to be complete nonsense.

First of all, she knew that Sweetie was by no means "too old" for stuffed animals. She herself would still sometimes fall asleep cuddling some of her handmade stuffed creations. On top of that all of her friends had stuffed companions of their own, Heck Fluttershy's cottage had just as many stuffed animals as real ones in it. Second, both she and her friends had researched their sisters' conditions enough to know that behaviors had nothing to do with whether or not they could potty train and such thoughts were just negative stereotypes at late blooming fillies and colts.

"Well go on precious," Rarity coos, giving her sister a few nudges on her padded flank. "Pick out any new friend you like." Naturally Rarity would be more than happy to buy her multiple new stuffies, but she figured it might be best to spread out how much she was going to pamper Sweetie Belle on this trip...after all it had only just begun.

At being given the freedom to pick any of them, Sweetie Belle found herself paralyzed with choice. Looking at all the cute stuffed animals, her eyes would settle on one only to be pulled away towards another. As she tried to settle on just one of them, her mind began to think about how to do just that. Maybe she should focus on an animal she didn't have? Although the ones she did have were her favorites for a reason. She idly moved back and forth considering her options, only stopping suddenly when she felt a sudden sensation course through her body wondering what that was, only to then feel the back of her diaper warming up.

Sweetie Belle rolled her eyes and ignored the fact that she'd just peed a little, thankfully it was just a little and the heat from it would soon fade. Shaking her head, she went back to the task at hoof, approaching the shelves until she spied a small plush nestled within the others. Using her own magic, she pulled it out, she'd spied the eyes of it, peering out from what looked to be shadows, the amber orbs were the eyes on a small black cat plush, it was entirely black, with perhaps a lighter charcoal color on its underside, Sweetie Belle couldn't quite tell. The expression on it wasn't happy or anything, in fact it was rather neutral, much like an actual cat.

Sweetie used her magic to levitate it onto her back. Thinking about how she'd heard that black cats were bad luck or something, but that sounded stupid. Moving back over towards her sister Sweetie said. "Can I get this one Rarity?" Sweetie Belle wasn't sure what she was going to call the plush yet, but it definitely struck her as a girl cat.

"Hm," Rarity had been admiring the stitch work on some of the larger stuffed animals when she heard Sweetie Belle's voice. "Oh let me see what you found," Rarity turns around and smiles at the cat plushie she picked. "Goodness what a darling little kitten," Rarity coos. "Of course you can get that one," She says with a smile as she guides her sister to the cash register. The shopkeeper is particularly friendly and even offers them a fifty percent off reduction.

"Least I can do for such a cutie," She cooes reaching over to tousle Sweetie Belle's mane. "I got a niece your age who's still in diapers too. She and I are gonna be in the audience of the show tomorrow. You gonna be watching too?"

"Oh well that's very kind of you," Rarity smiles, but then perks up even more at the question. "Actually, I'm a designer competing, and my precious little sister here will be my model," she coos leaning down to nuzzle Sweetie Belle.

"Really?" The shopkeeper perks up and closes the register. "Well in that case, no charge. Consider it a good luck gift."

"Oh my that's very generous, miss," Rarity says, a bit surprised. "But honestly I'm not sure if I can accept..."

"Believe me it's nothing," The mare says with a smile. "You competing is more than enough. My niece really struggles because of her diapers sometimes, but when she heard about this contest, a fashion show full of fillies just like her and filled with outfits designed to be worn by ponies like her. I'd never seen her so excited."

"Oh that's wonderful to hear," Rarity smiles but also glances at Sweetie Belle, hoping to see her reaction to the impact this show is having on fillies in the same boat as her.

Sweetie Belle was just happy that her sister approved, not that she thought Rarity would say no for some reason, just hearing her accept it was quite nice, she did make a good choice. Sweetie Belle thought it was odd that they'd get money off for her being cute, she wasn't that cute! Or maybe she needed to start going to more stores. Sweetie flinched slightly at being touched by a complete stranger, but quickly enjoyed the feeling of having her mane played with. As the mare explained that she had a niece of the same age then it made a lot more sense that they got the discount.

Sweetie Belle felt herself wanting to just jump into the piles of plush creatures as Rarity just went ahead and said she'd be competing, thankfully her embarrassment died down a bit as the mare gave them the toy for free and then explained why. Sweetie Belle hadn't really thought about what other fillies her age would think of the event, even she didn't quite get it, though she was more wary of everything fashion related because she knew how it was with her sister, Sweetie Belle expected there to be fillies there who were potty trained and just wearing diapers because that was the point.

If anything Sweetie just felt a bit more nervous about the whole thing, she was just here because her sister asked her, she didn't want to show off in front of ponies or anything like that, especially wearing diaper. Now she had this idea that other fillies probably expected her to embrace it or something, like she was leading the charge for this sort of thing. She didn't look sad or anything, but she didn't look overjoyed, just a neutral expression.

"Well we'll be sure to look for you two tomorrow, and good luck," the mare says with a smile. As she pats Sweetie Belle's head one more time and goes to help another customer.

"Thank you so much," Rarity says as she leads Sweetie Belle out of the store, being sure to hand her back her new friend on the way out. "Do you see now, Sweetie Belle?" Rarity asks once they're outside. "This competition means so much more to fillies your age than a simple fashion show. When they see you and others on stage it helps them realize that they have nothing to be embarrassed or ashamed about. You're inspiring them, precious." She adds with a smile.

She feels particularly grateful to that mare in the store for telling them that as it was one thing she really wanted Sweetie Belle to realize with this contest, or at the very least get a good confidence boost from her performance. In any case, Rarity glances at a clock stand.

"Hmm, we should have time for one or two more stores before we should head back for dinner," Rarity says glancing around. "Oh, let's go there," she points to a cosmetics store. "They carry some of the best bubble bath bombs I've ever used." She grins and starts leading Sweetie Belle again.

Sweetie Belle wasn't sure she did see, but she wasn't going to say that. "Yeah." Not entirely believing it herself. Maybe she'd come to see that once all this was said and done, but right now she was having a hard time imagining all the good she'd be doing by prancing about in diapers. Sweetie Belle mostly just wanted to put the competition out of her mind until tomorrow though, so she was happy to just go along with Rarity to more stores, even if they weren't exactly up her alley, although bubble baths were certainly something she enjoyed.

"Okay!" Sweetie said with a little more enthusiasm as she heads off after her sister. She may not overly enjoy the dressing up part of all this, but getting nice smelling baths, having her fur and mane brushed, all of that stuff often felt really nice and enjoyable, like going to the Ponyville Spa in a way, it was relaxing, and Sweetie Belle would be happy for anything relaxing while this competition was on her plate.

Rarity for her part enters a bit of an autopilot for the next few stores. Looking around for specific brands while also viewing anything new and interesting looking with her practiced eye, especially if it's on sale. Naturally she also keeps a close watch on Sweetie Belle at all times, occasionally even levitating her onto her back again when the store gets too crowded. While she did trust Sweetie Belle to be safe and she knew they weren't in a dangerous part of Manehattan, Rarity couldn't help but be a bit protective of her sister.

A couple hours later, the sisters walk back into their hotel room. Rarity dropping their several shopping bags onto the floor beside the bed.

"Well that was thoroughly delightful afternoon," Rarity says with a smile while also stretching a bit and yawning. "If a little strenuous. I for one think I could use a nice quiet evening of room service, TV, a bubble bath, and maybe just a smidge of cuddling," Rarity says, turing to Sweetie Belle with a smile. "How does that sound precious?" She coos leading in to nuzzle Sweetie Belle's nose with hers. As she does this, she also sneaks a hoof around to check her sister's diaper.

Sweetie Belle stuck to following her sister about as she shopped, ultimately nothing really caught her eye at any of the other places Rarity went to, and she was all too happy to be moved back onto Rarity's back at some point, mostly as she was getting tired of trotting around. Once they finally got back to the hotel room Sweetie Belle was more than glad to be off the streets and back where she could just relax without that much issue.

Of course she nuzzled Rarity back, sharing the moment with her as she stood there, though before she could think to say anything she felt that all too familiar pressure of a hoof touching her diaper. Even if Rarity did it lightly, Sweetie Belle would notice, after all it would usually have to be hard enough to at least squish the diaper to feel if it was wet enough, and by now Sweetie's diaper was quite wet, Rarity would feel the inside of the diaper leak even with a light touch. Sweetie Belle would feel wetness where Rarity pressed as the excess liquid slid against her flank before being sucked back into the diaper, where it thankfully wasn't wet enough to leak past the guards, or pearl out of the diaper altogether. "That sounds nice." Sweetie says, knowing that she has a diaper change to deal with first though.

Rarity smiles back at her sister, but upon feeling how wet Sweetie Belle is, she chuckles and lifts her up in her magic.

"Well I'm glad you're on board, darling," She coos as she carries her sister not towards the changing mat but the bathroom. "But on second thought, we might as well do the bubble bath first." She giggles as she also levitates her shopping bag from the cosmetics store with her bath bombs.

In the bathroom they see a large whirlpool tub that Rarity uses her magic to start and then add a bath bomb or two with a few other squirts of oils and bubble mixtures. Soon the bathroom is filled with sweet and soothing aromas. As the tub is filling with water and bubbles, she lays Sweetie Belle down and quick removes her soaked diaper, dropping it into the bathroom wastebasket.

"And there we are," Rarity says, turning off the water and testing it. Satisfied that the tub is at both the perfect temperature and depth. She turns off the faucet and lifts Sweetie Belle up. "Now let's get you nice and clean, precious," She coos as she carries Sweetie Belle into the tub with her. Obviously, Rarity loved bubble baths too, and she did enjoy taking them with her sister, after all it made it easier to clean her. She was aware that sometimes Sweetie Belle preferred to take baths herself, but this was a sisters bonding week for them so why not. In any case, once they were in, Rarity gets a loofa and starts to gently scrub her sister.

"Right." Sweetie Belle says as she's taken to the bathroom. The idea of having a bath sounded nice, especially with all that neat stuff Rarity bought, it would probably feel exactly like being at the spa. Before long the room was filled with the pleasant scents one would associate with places like the spa. It was always a bit odd having her diaper off for stuff like bathing, she was so used to it just being there, a subtle weight, that when it was off, Sweetie Belle felt like she could probably run super fast! Of course that was probably just her imagination, not to mention the fact that she was so used to trotting with her diaper on that she'd probably end up tripping if she went running.

Sweetie Belle couldn't help but roll her eyes a little as Rarity tested the water, it's not like she was a cat, she wasn't going to think it was too hot, or react that badly even if it was. Though Sweetie doesn't object as she's grabbed and settled into the tub with Rarity, normally she might, and even then only to keep up appearances. She actually loved talking baths with her sister, yeah, it was definitely foalish to do so, but this is one time she didn't care at all. Who would say no to bathing with somepony who basically did all the work for you? Not Sweetie Belle. The feeling of the water washing over her body was magical on it's own, she felt any fatigue simply glide off of her as the water enveloped her. It would be impossible to tell if Sweetie peed at all once she got in the water, Sweetie was so relaxed there was no way she'd notice, thankfully diapers meant she was usually frequently emptying her bladder, so if anything did drip out, there wasn't much of it.

"Mm.." Sweetie let out a low noise of contentment as she felt Rarity scrubbing her. It was especially notable for Sweetie Belle, after all Rarity never changed her diaper with anything but magic, so having her physically next to her, it just felt so much more cozy and personal.

Rarity hums to herself as she gently washes her sister, the older unicorn delighting from both the soothing feel and smells of the bathwater, but also the cuddling with her sister. While Sweetie Belle did chafe a bit at most of Rarity's more "foalish" treatments of her she was happy that bath time always seemed to be something that would get her little sister to turn up her cuteness and littler side.

"So Sweetie Belle," Rarity coos as she moves up to start scrubbing Sweetie Belle's mane. "How did you like your first day in Manehattan as a soon to be famous model?" Rarity says, chuckling a bit. "I mean we're obviously going to win the contest so I hope you realize that by the time we get back to Ponyville you'll be quite famous. Why, maybe some of the other fillies in your class will start begging their parents to put them back in diapers so they can be more like you." Rarity giggles a bit more at this. As a big sister it was only natural for her to like teasing Sweetie a little, but she did of course want to instill some confidence in her. After all, with their encounter of the mare in the toy store Rarity now felt she had an even better chance to change her sister's outlook on her condition than before. "In any case, I just want you to remember that whatever happens tomorrow I'm grateful and proud of you," Rarity says, stopping her cleaning to just pull her sister into a hug. "And rest assured that our week of fun has only just begun."

"It was fun." Sweetie Belle replied, taking a moment to answer since she was so busy just enjoying herself that it took some time for the words to come out. "I don't think I'm going to be famous though Rarity." Sweetie Belle said, immediately dismissing the idea, both because she didn't think it was possible, also because that might mean she'd be modeling diapers even after she got out of them? Not something she wanted to consider.

"Rarity, I doubt any of the fillies in Ponyville are even going to know I was in a fashion show." After all, it's not like Sweetie Belle was going to tell them she went to Manehatten to model dresses for diapers, even if she won! Sweetie Belle also couldn't imagine Diamond Tiara begging to go back to diapers, though that imagine was at least entertaining. "I know Rarity, and thank you." Sweetie Belle says as she hugs her sister, squeezing Rarity tightly. Sweetie Belle didn't think she'd grow to like the whole fashion show thing like Rarity kept imagining, but she was sure she'd love spending more time with her sister.

"Oh don't be so sure, but we'll see," Rarity says with a shrug as she returns Sweetie's hug and continues to clean her. Granted, it wasn't as though Rarity expected her sister to want to be a full time model after this show, but as long as she could end this trip with a good boost to her confidence she would be happy. In any case, Rarity simply continues to wash her sister and herself, and once satisfied that they're both clean she steps out of the tub lifting Sweetie Belle with her magic.

"Now that everypony is clean," Rarity coos as she levitates a bunch of soft towels over and proceeds to wrap one around her own and Sweetie Belle's mane, while using two more to dry them off. "Let's get you a fresh diaper," Rarity says as she carries Sweetie Belle out of the bathroom and lays her down on their changing station. She pulls out another diaper, this one a thicker nighttime one covered with Princess Luna themed designs. "Then it's an evening of room service, movies and all the cuddling your adorable little heart can handle," Rarity coos, leaning down to kiss Sweetie Belle's nose. She proceeds to unfold the diaper and slip it under Sweetie Belle's flank. After giving her the usual good dusting of foal powder she tapes it up at the perfect snugness, just barely managing to stifle a chuckle at how the thicker diaper widens her sister's hind legs to an, at least in Rarity's opinion, adorable extent.

Sweetie Belle got the feeling that the only pony who was going to tell anypony was Rarity, and that she might just tell everypony. She put that thought aside for now though, more than happy to just enjoy her time being cleaned before finally being taken out. Lamenting that the bath had to be over with so soon, she was sure Rarity would have some sort of comment about staying in the bath too long if Sweetie insisted, although the longer she went without a diaper the more chances she had to make a rather embarrassing mess, so perhaps getting out sooner than later was better.

Sweetie Belle relaxes as she's swapped into a much thicker night time diaper, Sweetie Belle briefly wondered how Luna felt about these sorts of designs, then briefly wondered if Princess Luna even knew about them at all, did fillies still wear diapers a thousand years ago? The thoughts were brushed off of her brain as Rarity spoke again. "That sounds great~" Sweetie Belle replied after Rarity gave her a little kiss, giggling softly as the scent of foal powder filled the room. Sweetie's hind hooves were certainly held open more with a thicker diaper, not that Sweetie minded all that much, she usually didn't have much moving around to do anyone once this diaper came on, a good sign that the day was winding to a close.

Rarity smiles back, levitating Sweetie Belle onto the bed and then making her way over to the room's phone.

"Hello, this is Miss Rarity in Room 378 and I'd like to order dinner, please," She says, while also bringing the menu up from the bedside table. "Hmm, let's see I'll have a the Fettucine Alfredo with Carrot Balls and a side salad. While my sister will have an oat burger and hay fries. Oh dessert? Well let me see," Rarity pauses and flips the menu over. "Hmmm, oh we'll split this delightful looking double chocolate fudge cake of yours.
20 minutes? Perfect thank you so much." Rarity says with a quick lick of her lips. After all, just because she was focused on pampering her sister this week didn't mean she wasn't going to enjoy some self pampering either.

"Now then precious," Rarity turns to Sweetie Belle as she hangs up the phone. "While we wait for our food there is just one remaining question. Do you want to spend the evening and night in just your diaper....or...." Rarity grins and opens her suitcase levitating out an outfit that Sweetie Belle knew all too well. It was a footed sleeper that Rarity had made for her when she was just a foal. Sweetie Belle had loved it back then, but while she hadn't outgrown diapers the same couldn't be said for the sleeper. Until of course Rarity remade and enlarged it. Now it was her go two outfit whenever she wanted to encourage Sweetie Belle to relax and/or act a bit littler.

Sweetie Belle got cozy on the bed as the voice of her sister drifted over, but Sweetie wasn't paying all that much attention, after all she knew Rarity had pretty good tastes when it came to food, and Sweetie wasn't all that picky herself, so there wasn't anything to worry about with the food. Instead she stretched herself out on the mattress, even if she hadn't done as much trotting around as Rarity had, she still felt pretty tired from how much they had moved about. Not to mention it was a little harder on her hooves to be walking around on so much hard streets, compared to Ponyville where basically all the roads were just the ground.

Sweetie Belle turns her attention back to Rarity when she turns towards her, Sweetie Belle laying with her hooves outstretched in front and behinds her. "Yes!" Sweetie Belle agrees instantly when she see's it. Her sleeper was always something she felt snug and cozy in. It was the comfiest piece of clothing she'd ever worn and it made her wonder why ponies didn't just wear comfy stuff all the time. If only Rarity made clothes like that instead of the fancy dresses.

Rarity simply smiles and makes quick work of getting her sister into her jammies. Upon finishing she steps back for a moment to look her over, cooing at how adorable she looks, between the colorful patterns and the way it makes her diaper bulge even more pronounced. Without another word, Rarity springs onto the bed, pulling Sweetie Belle into a warm hug, and nuzzling her lovingly. Though she'd never say this out loud, there were some moments that Rarity wished Sweetie Belle would stay a little filly in diapers. Somepony for Rarity to pamper, cuddle, and dress up forever. But of course she was too good a big sister to actually wish for such a thing, which meant she had to get all her fun in now while she had the chance.

As they're cuddling, Rarity uses her magic to turn on the room's TV, flipping through the channels until they land on something they like. As they watch, a commercial comes on announcing the performance of "My Fair Filly" that is coming up tomorrow night, and Rarity stifles a chuckle as she starts to imagine the look on Sweetie Belle's face when she surprises her with the tickets after the competition tomorrow.

About this time there's a knock on the door, and Rarity, somewhat begrudgingly lets go of Sweetie Belle and goes to answer. After taking the food and giving the waiter a generous tip, she levitates a tray onto the bed.

"Dinner time Sweetie," Rarity coos as she levitates a napkin around Sweetie Belles neck and ties it off. She sits down and ties a napkin on herself as well and starts to eat, while keeping the TV on.

Sweetie Belle quickly gets dressed and enjoys the feeling of her pajamas, like wearing a comfy blanket all over her body, it was just great~ Sweetie Belle finds herself pulled into bed with her sister, cuddling with her, being nuzzled, and no part of her objects to it. Happy to just lay there with Rarity, watching television with her as they lounged, seeing the ad for "My Fair Filly" has her eyes glued even more to the screen in that moment.

The sound of a knock on the door barely even registers to Sweetie, that is until Rarity releases her and goes to it. Sweetie Belle immediately spreading herself out once she was left on her own. Though it wasn't more than a moment before Rarity came back with the food, and while wearing a 'bib' of sorts would be embarrassing out in public, in the room like this, Sweetie Belle thought it was pretty practical, as she didn't want to make a mess of things either.

Rarity simply enjoys her pasta, keeping her eyes on the TV but also glancing at Sweetie Belle from time to time to make sure she isn't getting messy. After all while she had personally made sure to teach Sweetie Belle proper manners she knew how young fillies could get in such a relaxed state, but while it was tempting to wipe her muzzle a few times she figured it would be better not to risk annoying Sweetie Belle by treating her that much like a foal. In any case, soon enough Rarity is just watching the TV and trusting her sister to eat cleanly alone, after all they still have that dessert to split.

As the two sisters are enjoying a fun and peaceful moment in their room, a few blocks away a far less peaceful scene is unfolding as Suri Polomare slams the phone of her own room down.

"Ugh that little runt..that many bits just for wearing the clothes, ha! She was lucky I offered her the job at all!" Suri grumbles as she starts stomping around her studio, venting her frustration at the fact that her model for tomorrow's competition had just quit on her. Of course this had been the fourth model to do so since Suri was accepted into the competition. Needless to say the combination of her tarnished reputation and her personality had left few ponies willing or interested in working for her in any capacity. "I cannot believe this! This show is my ticket back into the Manehatten inner circle and I can't even find a model! And to top off that miserable, stuck up Rarity of all ponies is competing. Tch there oughta be a rule against using your own sister as a model. That pipsqueak doesn't even look...." As she's ranting, Suri pauses, her face soon turnining into a sinister grin. "Hmmm, maybe I should patch things up with my old pal Rarity...and that cute little sister of hers...." Suri says to herself as a plan strikes her.

Back in the room, Rarity remains unaware of the scheme being hatched and has just finished her dinner.

"Ah delicious," She says, levitating her dishes aside. "Ready for our dessert Sweetie Belle?"

Sweetie Belle does eat fairly cleanly, if only because the knowledge of if she doesn't eat cleanly is sitting in the back of her mind, she knew her sister was more than prepared to rip her right out of her comfy jammies and throw her right back into the tub if she got too dirty while she ate. So Sweetie did her best to avoid it, of course she wasn't without fault, occasionally getting crumbs or such on herself, but there was no major annoyances with it.

As her meal settled into her stomach, Sweetie Belle was starting to feel lethargic, though the mention of dessert perked her right up. "Oh yeah!" She exclaimed, eager for more delicious foods. Of course as her mind focused on the taste of something sweet and decadent, her body was more focused on other needs. It was starting to be the time for lunch to make it's reappearance, though Sweetie Belle had little feeling that her body was preparing for that.

Though there were a few signs, not big ones right away, a slight flicking of Sweetie Belle's tail, a certain sensation deep within her lower abdomen, one that Sweetie either seemed incapable of feeling, or because her mind was so occupied with other things, that the feeling simply went ignored.

Rarity smiles as she uses her magic to cut the fudge cake into two equal pieces and floats one over to her sister. After one more, partially reflexive, wipe of Sweetie Belle's muzzle, she turns to her own cake, soon being taken in completely by the rich flavor. Now normally with her usual attentiveness and punctuality Rarity was always on top of her sister's...movements, and she knew full well that Sweetie Belle did typically have a final one in the evening. However, between her own delight at all the fun they've been having, the delicious food, and how comfortable she was...it had mostly slipped Rarity's mind, otherwise she might have thought to give Sweetie her bath later.

In any case, Rarity soon focus back on the TV and her own dessert, also not picking up on any of the subtle signals that Sweetie Belle, or rather her body, is giving.

Sweetie Belle quickly began to eat the cake, loving the flavor of it. As she ate however, she began to slow down, her usual gusto fading as her movements became more stiff. Her face didn't quite contort like it usually did, likely because she was in the middle of eating, but she'd take another bite before looking rather seriously at her dessert, movement stopping altogether as she seemingly paused while eating.

Suddenly the fillies tail was flicking upwards, a subtle. "Hngh.." Escaped her lips a shuddering pressure suddenly swelled within Sweetie, like a balloon inflating with cement inside of her lower abdomen, the feeling was quite uncomfortable and before Sweetie could even really think about what she was about to do, she'd already done it. The pressure inside of her subsided just as quickly as it had arrived, Sweetie Belle's features and body visibly relaxing as she felt that all too pleasurable sensation dance up her spine as her body saw fit to unload then and there.

Sweetie Belle was quickly met with the feeling of a heated mass slipping into the back of her diaper, pushing it out before meeting resistance and simply sliding down, feeling it against her body, things had been relatively quiet all things considered, but lunch decided it wanted to get a little noisy, a spluttering sound of flatulence streamed out of her, it stuttered as it slipped out between the sludge sliding into her diaper. The smell had only just began to fight against the powder and with that bit of gas it seemed to gain the upper hand as a fetid odor rolled away from Sweetie Belle's backside, filling out into the air all around it.

This was not a quick thing either, Sweetie Belle was doing quite a bit of shifting through her backside, things sliding up to the front of her diaper as it was pushed out more and more with a rather hefty mess thanks to some rather generous meals. Sweetie Belle, after getting over the initial euphoria of making a mess in her diaper, quickly grew used to it and simply resumed eating, going much more quickly, and only pausing as her body shuddered as another wave of fresh horse apples came out of her, the little filly filling her diaper while filling her belly, seeing nothing wrong with it herself, rather, she knew her sister was going to change her as soon as she was finished, so Sweetie wanted to finish her dessert before she did. Swallowing the last remains of her cake as the last of the gunk settled into her diaper.

Rarity for her part is at first wholly focused on the cake as well, eating a bit faster and more vigorously than she normally would in public. After all while Rarity did value her status as a proper lady quite highly, she did appreciate that her little sister would never judge her for "cutting loose" when they were alone. Of course by just about any other pony's standards Rarity's ideas of "cutting loose" weren't much to consider.

In any case, soon enough her nose wrinkles as the smell of her sister's accident hits her and her ears perk up to hear that Sweetie Belle clearly isn't done. Rarity very silently gulps and chooses to focus back on her cake while she listens to her sister finish. Again, she would never judge her sister for her condition or shirk her responsibility when she was in charge of her, but when she made messes this big it did push the prim and proper pony to her limits. Though she also has to acknowledge that it's not that much of a surprise that this is happening and she should have been more prepared for it anyway. Furthermore, the cake is a welcome and effective distraction.

Once she finishes, she sighs contentedly and turns to Sweetie Belle with a smile.

"Well that was delcious, but before we return to our cuddling I have a sneaking suspicion that somepony around her needs a fresh diaper," Rarity coos, levitating Sweetie Belle into the air and towards the changing table. She also takes the liberty of removing her sleeper not wanting it to get dirty during the change, so by the time Sweetie Belle is on the mat all she has on is her very full diaper. "Now just hold still precious, we'll have you clean and cozy again in just a minute." Rarity coos, leaning down to peck Sweetie's forehead while gathering her supplies.

Sweetie Belle was happy she'd finished her cake, doubting that Rarity would have given her the opportunity to do so if she'd finished doing her business before finishing the cake. Sweetie just rolled her eyes at Rarity's comment though, as if there was any other option for a diaper change other than her. "I suppose it wouldn't be you who needs changing." Sweetie Belle couldn't help her sarcastic remark, if Rarity got to make silly statements about her, than the reverse was fair game.

Sweetie fully expected the sleeper to come off, though she shivered a little, the sudden lack of warmth surrounding her body was mildly annoying, though it did also allow the scent of her padding to leak through just a tiny bit more. "I'm not going to roll around Sis, I'm not a foal." Sweetie Belle stated as she was laid on the mat. Though Sweetie could have done such a thing just to annoy her sister, she decided not to, after all Rarity was treating her so well during this, it would be wrong of her to do something so foalish. Not to mention she had a pretty good idea of how hefty her diaper was, and it seemed a bit more full than her usual deposit, which was just another reason not to make things more difficult.

"I'm well aware of that, precious," Rarity says as she starts to magically unfasten the tapes on Sweetie Belle's very full diaper. "But I am also well aware of how...free spirited you can get when we are alone and relaxing like this. Not that I mind of course," Rarity winks as she opens the diaper, flinches for just a moment at the smell, but quickly gets to work wiping her clean. "After all, even when you get out of diapers, get your cutie mark, and no matter how old or big you get," Rarity pauses as she gives one final wipe to Sweetie Belle's bottom and balls up the used diaper, sending it straight to their trashcan, "you'll always be my precious little sister." Rarity coos and with Sweetie clean, she leans in to blow a raspberry on her exposed stomach.

As much as she knew Sweetie Belle didn't want to be regarded as a foal, Rarity could only hold back her big sister instincts for so long. Besides, what was the harm in them having some fun here in private.

Sweetie Belle felt the diaper come undone, it shifted as the tapes were pulled away, the contents within moving it when the tapes didn't hold it firmly in place. Then it was opened completely. Sweetie shuddered a little as the much cooler air rushed in where it had been quite hot, she wriggled just a little, but then went back to being completely still, only slightly moving in reaction to being wiped, she greatly enjoyed getting clean after all, so she savored it. Of course she was entirely unprepared for when Rarity blew a raspberry on her stomach.

"HAHAAAHHA!" Sweetie Belle laughed loudly, completely taken by surprise, she went on into giggles and she began to squirm and wriggle, shaking and rocking as well, hooves flailed for a moment at the start before only twitching as Sweetie Belle did her best to not accidentally kick at her sister. "R-R-Rar-it-ty!" Sweetie Belle tried to exclaim through the giggles, trying to get her sister to stop, though she could barely speak through her laughter as well as trying to breathe.

Rarity pulls pack and watches Sweetie Belle squirm and laugh, giggling a bit herself. There were few sights more adorable to her than this. In any case, once Sweetie Belle calmed down enough Rarity made quick work of sliding a new extra thick Luna patterned diaper under her flank, giving her a good dusting of powder, and taking it up snugly. Once that was down, she got Sweetie back into her sleeper and soon the two of them were cuddled on the bed again.

"Now we can watch a little more, dear," Rarity says switching the TV back on. "But we don't want to stay up too late. It's a big day tomorrow and we'll have to get up a little early. Besides, don't want my precious model to look sleepy on her big debut." Rarity coos and nuzzles Sweetie Belle. She knew all too well that tomorrow morning would likely be chaotic no matter when they went to sleep, but she didn't want to worry her sister or discourage her from relaxing. After all, the more relaxed she was tomorrow the better for everything. Also at this point Rarity had another thought to consider. There were technically two beds in the room, but she was starting to debate if she should ask Sweetie Belle if she wanted to sleep with her. Not just for her sake, but Rarity was enjoying their cuddling quite a bit too...

Sweetie Belle spent the remainder of the change trying to catch her breath as she laid there panting. She was a bit annoyed at her sister for doing that, but not overtly so, if anything she was definitely ready to go to sleep now, though it was rather fortunate that Sweetie hadn't had her stomach upset by all the tickling, even now though she felt a little bit of nausea setting in. She hardly felt the new diaper as it was put on, though it was quite easy to notice once it was there, a thick overnight diaper.

Sweetie Belle nodded to her sister as she was brought back, nuzzling with her with much less energy than before. it wasn't all that long before Sweetie's eyes began to droop, and then they were shut entirely, the little filly drifting off to sleep with a full belly, and being tuckered out, of course the day had taken quite a lot out of her, but that sudden tickling had really pushed her over the edge, so she gently slept in Rarity's embrace, likely to keep sleeping until the next day when Rarity would wake her up, unless Rarity did anything to disturb her slumber earlier.

Rarity smiles as she feels Sweetie Belle fading against her, the older mare starting to gently stroke her sister's mane to better ease her into dreamland. Once she's fully asleep, Rarity switches off the TV and gently levitates Sweetie into the air so she can pull back the covers. Technically, the room she'd gotten did have two beds, but Rarity was still in a cuddly mood so she made a big sister executive decision that Sweetie Belle was going to sleep with her tonight.

She lays down beside her sister while also levitating the sheets over them. With a kiss to her forehead, Rarity cuddles Sweetie Belle close and soon falls asleep herself. The unicorn sisters fall asleep peacefully, unaware that another pony has a truly malicious plan in store for them, as meanwhile Suri is making her way to the apartment of an old "friend" of hers.

The next morning, Rarity is woken up extra early by an alarm she set, but turns it off quickly as not to wake Sweetie Belle too. After all, she had her own routine and things to do in the morning and there was no point in risking Sweetie Belle be tired for her big debut. Rarity quickly takes a shower, does her hair, makeup, and makes sure the outfits and supplies are all packed for the show, before going back to the bed and starting to gently prod Sweetie Belle.

"Sweetie Belle, precious," She coos. "Time to wake up. We have to get a certain little filly to her fashion debut so all of Equestria can be enamored by her adorability."

Sweetie Belle slept through the night, and the alarm Rarity had set, only stirring a little bit after Rarity left her in bed, of course she'd wet her diaper, several times in fact, through the night, that was what the night time diaper was for after all, sodden and expanded greatly, with that familiar scent, one the powder had long lost against as the musty odor of urine wafted from it, thankfully it was mostly kept under the covers.

"Mm.." Sweetie Belle wriggled as she began to wake up, she didn't even hear what her sister had said specifically, just that there was noise next to her that kept going. So with a large yawn and several hooves stretching out, Sweetie Belle finally fluttered her eyes open as she woke up. "Morning.." Sweetie said a very sleeping sounding greeting as she worked her way onto her hooves unsteadily. In fact she looked like her hooves would simply fall out from under her and she'd return to laying on the bed, though Sweetie Belle knew her sister, and she wagered Rarity would quickly grab her for a diaper change.

Sweetie Belle's instincts prove accurate as she's soon whisked off the bed and laid on the changing mat.

"Good morning to you precious," Rarity says as she quickly gathers up the changing supplies. She's trying not to rush or overwhelm her sister, but time is starting to be of the essence. "Hope you slept well because we have a big day ahead of us," She says and proceeds to make quick work of changing Sweetie's diaper. Once she fastens the tapes she pulls her to her feet and starts rushing about the room, packing Sweetie Belle's dress and other clothes, packing her extra tools, and of course packing a diaper bag.

"Unfortunately I'm afraid there isn't time to have a proper breakfast," Rarity says as she leads Sweetie Belle out the door. "But there's always refreshments and catering backstage at these events so don't worry." Rarity leads Sweetie Belle, in just her diaper, to the elevator and soon they're on the street heading for the contest. Fortunately, Rarity had intentionally chosen a hotel that was only about two blocks from the venue, so it wasn't going to take long. Also, at this point the sidewalk was full of pony pairs just like them. Designers with all their supplies and young ponies with exposed or barely concealed diapers.

The contest hall itself is fairly chaotic and loud. Fortunately Rarity, being experienced at moving through such crowds, lifts her sister on her back and effortlessly makes her way through the mass of ponies to the registration table.

"Hello, Rarity and Sweetie Belle," She says to the pony behind the table, who hands them a pair of ID cards.

"You're in dressing room 12, hon," The pony nods casually before turning to the next contestant.

"Thank you," Rarity nods and hurries back to their room, where she sets Sweetie Belle and all their bags down, before finally exhaling. "Oh sorry about that, dear," She says walking over to stroke Sweetie Belle's mane. "I'm afraid the first day is always particularly hectic at these events."

Sweetie Belle only slightly wakes up after she's had her diaper changed, being swept along in the wake of her sister, Sweetie can really only do her best to not end up falling behind or anything like that. Of course this rushed departure didn't help Sweetie feel any better, she could feel her nerves getting worse as the weight of it being the day hit her. Though the rush had ended up with her forgetting about her diaper or anything related to it, rushing too much to really notice.

Sweetie Belle finally finds herself in a dressing room with her sister, sitting down and letting out a yawn. She feels an odd mix of tired and nervous. Doing her best to calm down a bit as Rarity begins stroking her mane. "Uh huh.. So how long before it starts?" Sweetie Belle asks, though the one thought on her mind right now was if she'd be able to just doze off for a bit since Rarity would be getting her into a dress and messing with her mane and such, Sweetie knew she wouldn't have any input on that stuff, so maybe she could get away with that.

Unfortunately, Rarity could tell what her sister had in mind and proceeds to prop her up, gently of course, with her magic.

"Now, now Sweetie Belle, none of that," She coos, levitating over a hair brush and getting to work on the younger filly's mane. "I know you're still waking up, but I need you to concentrate. Remember what I said about how important your first impression is and it won't do if you go out looking all sleepy and like you just rolled out of bed," she levitates Sweetie Belle over to a vanity mirror set up in the corner. "Now I'm going to go grab us some light breakfast. You stay up and start getting yourself ready okay?" Rarity coos, before nuzzling Sweetie Belle's cheek and walking out.

The common area of the backstage is predictably full and chaotic when Rarity enters.
Some ponies frantically pushing around racks of clothing, others carrying packages of diapers on their backs, and some even doing both. There were also some ponies that seemed to be in the middle of preparing their models. Some were brushing manes, others putting on make-up, and Rarity even saw a few ponies in the middle of diaper changes. Thankfully Rarity, manages to maneuver through the mass of ponies with a practiced ease. Soon arriving at the refreshments table and preparing a small plate of pastries and a couple of drinks for her and Sweetie Belle to share.

As she heads back to her and Sweeties' dressing room, Rarity fails to notice that another pony is watching her closely with a sinister smile. Suri Polomare keeps an eye on Rarity from her own dressing room, all too excited to have a chat with her rival. And to show her a certain picture.

"Mm.." Sweetie Belle replied in an annoyed, and sleepy way as Rarity got to work brushing her mane, which was not helping her to stay awake, having her sister fiddling with her mane like that felt a bit too relaxing for how tired she was. When her sister left she had to fight all of her urges to just slump over and begin dozing again, to that end she forwent attempting to fix herself up, mostly because if she did anything wrong Rarity would just have to fix it. So instead she turned her attention towards stretching, yawning, shaking her legs, anything to help her feel more awake, shrug off that sleepiness.

Once she was feeling a bit less tired, Sweetie looked over the vanity at all the various things that were supposed to make her look pretty, and just didn't even know where to begin with it, she'd never paid all that much attention to Rarity when her sister was fixing her up, and the idea that she'd just screw it up was enough for her to just wait for Rarity to come back. Especially as she'd then get something to eat.

Fortunately Rarity soon returns to their room with a plate of pastries. Figuring a little sugar should be just what her sister needs to wake up a bit more. She wasn't particularly surprised. Sweetie had never been a morning pony, not that Rarity had been one either when she was her age.

"All right Sweetie Belle," She says, scooping her up and setting her at a small table. "Let's get some food in you then we'll start with your mane and make up and finally, we'll put on your dress...Oh you'll look just wonderful..." Rarity squeals, her excitement at seeing her little sister as a true model finally starting to bubble up again. "I bet you'll have a whole fan club here in Manehattan by the time we leave..." She says as she eats a pastry and winks at her sister to help increase her confidence.

Sweetie turned towards her sister as she came back in, eyeing the pastries like a hungry timberwolf, as she was quickly scooped up and set at a table, she began to happily eat the offered food, much more content to be filling her stomach, though she didn't have nearly the same enthusiasm her sister had over getting dressed up. She wasn't sure she ever would, not to mention the idea of having a fan club was not something she wanted in the slightest. It was already kind of weird that Scootaloo had a whole fan club for Rainbow Dash, she couldn't imagine ponies doing anything similar for her just because she looked cute.

Though Sweetie also didn't take that statement with much merit, after all, Rainbow Dash did cool things, and looked pretty nice doing them, she was just going to be in a contest with other fillies who would probably look even cuter than she did. "If you say sis." Sweetie Belle offered, if anything the idea of losing was much better to her, even if her sister wouldn't be happy about it, not that Sweetie was going to intentionally try to lose or anything.

Rarity smirks at Sweetie Belle's tame answer, but simply shrugs and keeps eating herself. She knew her sister wasn't particularly interested in fame, at least not for something like this, but she was still hoping to at least win a little to boost her confidence. Of course Rarity also couldn't deny she was hoping to boost her own reputation as a designer as well, after all that was mostly the point of such contests.

In any case, once the two are done eating Rarity stands up and immediately scoops up her sister in her magic.

"Sorry if this is a little overbearing, Sweetie Belle," Rarity says as she carries her sister to the vanity, sets her down, and proceeds to get to work, several cleaning and makeup utensils levitating behind them. "But we don't want to rush your appearance." She coos as she cleans her sister's face and mane, then proceeds to apply makeup and braid her hair. "Ah there we are," Rarity says as she steps back, looking at her made up sister. "Now let's get your dress on, but first," she pauses to check Sweetie Belle's diaper just in case she needs a change before they put her outfit on.

"I know, I know." Sweetie Belle says as she's set into position. Most of the work involves Sweetie Belle just sitting still, if Rarity needs her to move her head, or body at all, her sister will just move Sweetie Belle into place, seeing as Sweetie was barely paying attention to just what Rarity was doing, that was usually better than asking Sweetie to move on her own. At the very least she got to enjoy the sensation of being touched, it was rather relaxing, if a bit boring. Thankfully she was still a bit tired from waking up, so just sitting and relaxing while her brain got to being fully awake was fine by her.

Sweetie's diaper was actually dry. Not that she hadn't peed a little, she almost certainly had, but not enough for it to even register as being wet to the diaper, it felt dry and smelled clean all around. Sweetie didn't feel like her diaper needed changing either, but it had already been long established that they didn't exactly see eye to eye on how used a diaper needed to be before changing, but even Sweetie doubted Rarity would change it right now, unless her sister wanted her to wear a specific diaper or something.

Rarity is content that Sweetie's diaper is clean enough and proceeds to levitate over the dress. As she's doing this there's a knock on their door.

"First presentation starts in 20 minutes, gonna need all contests on the stage by that time!" A voice comes through.

"Thank you, we'll be right out," Rarity calls back through the door before turning back to Sweetie Belle as she gets her into the outfit, which naturally leads to a few more tweaks to her mane, tail, and make up. Fortunately, Rarity is able to do all of this in a controlled and non-intrusive way.

"Now Sweetie," Rarity says as she makes the finishing touches. "This first part is a simply procession around the stage. Just walk in line with the other fillies, try to smile, and be your average adorable self. After that we'll just wait for our personal performance, then when that's over we'll head back to the hotel." Rarity smiles as she steps back finished, admiring her sister's look. Her main is done up in an adorable pair of braids and her tail is combed to have a perfect curl. As before the dress completely conceals her diaper, save for the bulge, but if anything it compliments it. "Oh if I wasn't worried about messing up your make up and hair I'd be cuddling you so hard right now, precious. You couldn't be more adorable." Rarity coos, setting to simply nuzzle noses with Sweetie. "Now are you ready?"