Dream Cycle - Celly and Lulu

by Arbanis

Rating: mature
Tags: My Little Pony: Friendship is Magic, Nightmare Moon, Princess Luna, Fetish, Comedy, Princess Celestia
Length: 21105

Celly and Lulu are off to Lulu's... first? Day at school? It's all a bit confusing, and that's before you consider all the diapers...

Celly and Lulu are off for Lulu's first day at school! It's an exciting moment, though there don't seem to be many other students.
And their teachers all seem a little bit... plush. If well suited to their subjects.
And there's an awful lot of diapers involved...

This is something a little different. It's a story I've done with Mintycandy, and is part of a series - but each part is focused on a different character (or characters) and will be posted as a separate story.

The cover art is by https://www.furaffinity.net/user/randommutationromances/

It features diapers, odd logic, and things like that.

Published 2019-08-03 20:50:01 UTC
Last updated 2019-08-03 20:50:01 UTC

Chapter 1

Lulu sneaked into the room, keeping low to the ground as she approached the bed. Slinking along, she slowly rose up the closer she got to the bed. Then, with a flash, she leaped onto the bed, jumping up and down on the pony still under the covers. “Getupgetupgetup! It's our first day of school!” Lulu cheered, her mane bouncing as she did as well. There was a groan from under the covers, Lulu's bouncing coming to a stop as an aura of golden magic surrounded her tail. She was levitated off and unceremoniously dumped onto the floor as the covers were pushed back.

Celly rubbed her eyes as she sat up, her mane fluffed out at awkward angles. “Lulu... it's too early for school...” She looked over to the clock, blinking several times before her bleary vision cleared enough for her to read the clock on the wall. 7:00. Maybe it wasn't too early. Groaning a bit, Celly slid out of bed and trotted over to the door, Lulu bouncing up and following her excitedly.

“Come on, you gotta be a little excited! We're gonna learn so much cool stuff!” Lulu exclaimed. The two made their way to the bathroom to prepare for the day, Celly brushing her mane into a more agreeable style.

“The tutors weren't very exciting last year, Lulu, trust me. Well, the music teacher was alright I suppose...” she said. Perhaps this year would at least be more interesting with Lulu with her.

“Well, maybe,” Lulu shrugged, not put off much.

The alicorn shook her own hair out, preferring the slightly more touseled look to how Celly liked to control it, and looked herself over in the mirror.

“Okay, I've got my uniform on… anything I missed?”

“Not really,” Celly replied.

“Hey, Celly…” Lulu added, frowning. “How come we're going to be in the same classes?”

Celly blinked, not quite sure.

“Well, it's because...” she began, searching for an explanation, then nodded as one came to her. “It's because the classes are on rotation. Everything's taught in cycles, so classes are always going on in sets rather than in a single go and so you and I will be in the same class.”

That made total sense to both of them, and they nodded.

“Well?” Lulu asked. “Come on, let's go! We'll be late otherwise!”

“We won't,” Celly countered, but hurried after her sister anyway.

“Wow...” Lulu said, staring up at the name of the school over the gates. “I'm so glad we're getting to go to the Royal Sisters' School for Deep Learning!”

“Really, Lulu, it's just school,” Celly told her, trotting past. “You'll get used to it soon enough.”

“But I haven't, yet!” Lulu countered. “It's going to be great!”

She reached into her saddlebag and retrieved a timetable. “So, let's see… it looks like our first class is… Induction? That's a funny word.”

“It just means they're introducing us to the school,” Celly said knowledgeably. “It's got a fancy name because they like that sort of thing.”

Lulu shrugged, figuring that sounded about right. All the ponies at their castle certainly liked using over fancy words whenever they could too. And if this was a school for princesses, it only made sense that everything would be fancy here. The pair walked through the gates and up to the front doors, Celly looking around. “Huh... I thought I remembered more ponies here last time.”

“But we're the only royal sisters! How would there be more?” Lulu responded, following the map towards the auditorium. Celly frowned, wondering why just two sisters needed such a big school to themselves when the tutors could just come to the castle. She shook her head, figuring it must just be another thing she'd understand when she was a proper princess. She followed Lulu through the hallways, figuring she might as well sit through the induction again this year if their classes weren't going to start until after anyway.

They were soon stepping up to the doors of the auditorium, Lulu rushing up to the front, Celly begrudgingly following as she had been hoping Lulu at least planned on sitting a few rows back. The two waited patiently, Lulu triple checking her saddlebags had everything she needed in them. Eventually the house lights dimmed, and those on the stage lit up to illuminate the pony trotting on stage.

“Oh, look!” Lulu said, pointing. “Isn't that Twilight Sparkle?”

“Lulu, ssh!” Celly hissed, then turned her own attention to the stage as well.

It did indeed look like it was Twilight Sparkle, trotting out onto the stage with her horn glowing slightly as she moved up to the lectern.

Something about Twilight seemed a little odd, though. In the first place, Celly was fairly sure there was something fundamentally off about her being a student at a school where Twilight Sparkle was a teacher… but whenever she tried to focus on what that problem was, it somehow just didn't seem important, like it was just an idle idea she'd had which went away before she properly focused on it.

On the other hoof, even if going to a school run by Twilight Sparkle was normal, this Twilight Sparkle didn't seem… quite right, somehow. She seemed oddly large, fluffy… not fat, exactly, so much as oversized.

Celly thought about it, and shook her head. Why was it that she felt that a bigger alicorn should have a more slender build? Perhaps that was just the same kind of idle idea the other thing was.

But when she looked more closely, Twilight did still seem odd. Almost… plushy, in fact.

“Welcome to the Royal Sisters' School for Deep Learning!” Twilight said brightly, her horn flaring as a collection of slides slid into the projector. “I'm delighted to welcome both our new pupils and those coming back for another year.”

There was only one of each in the room, but Twilight continued uninterrupted. “I hope you'll do your very best to get as much out of your time at school as possible – listening to your teachers, doing your work, and remembering that you're here to learn.”

A slide clicked into place, and Twilight continued talking about the importance of education and the valuable experiences that a student could learn at the School.

Celly had heard it all before, she thought, and it made her yawn a bit… but Lulu yawned as well as Twilight's voice went on and on, so she didn't feel guilty.

“We've invited a host of new teachers to the school, so even those of you who think you've learned everything will have some new opportunities to experience as well.”

Twilight clicked to another slide, showing a couple nondescript ponies playing hoofball. “Of course, learning isn't just limited to books and paperwork. We'll teach you plenty about how to stay fit and healthy, and there's a lot to learn about being princesses too. Princesses need to know how to dress and act in front of their subjects, and about royal decrees.”

Twilight's next slide showed two ponies dressed up in regalia that looked just a little puffier than Lulu expected a royal dress to look, and then a pony signing a paper. Celly thought she saw the word 'diaper' in the fine print on the decree that was being signed, but it passed by too quickly for her to be sure. After all, why would there be a decree about diapers anyway? That's just silly.

While Celly was thinking to herself, she missed the next couple of slides as Twilight continued her speech, flipping through her notes to make sure she hit every important point. Celly had a hard time suppressing another yawn, only vaguely picking up on what Twilight was talking about. Something about the attendance policies, the conduct code, the dress code...

It was at that point that Twilight paused, looking out over the audience. “...and it seems we have a few members who have forgotten that part! Our new students may have an excuse, but those returning really ought to know better!” Celly and Lulu looked at each other, both feeling a bit guilty. What had they forgotten? Celly didn't remember a uniform last year.

Celly was too busy racking her memory for what the uniform was – sure that if there was a uniform she must have at least seen it last time – to focus entirely on the remainder of Twilight's presentation. She got a few snatches of it, but trying to focus more than enough for the odd image or sentence seemed quite beyond her at the moment.

There was something about the lunch canteen, which apparently had an excellent supply of bottles – something that seemed odd to focus on, but Celly didn't really have any solid objection to that. There was a bit about the importance of listening to teachers to provide a structured learning environment…

Finally, after what felt like hours, Twilight's induction speech came to an end. Celly and Lulu yawned a bit, blinking and stretching a little as they realized, and Lulu raised a hoof a bit uncertainly.

“Yes?” Twilight asked.

“Well, um…” Lulu began, blinking a few times as she looked at Twilight. The pair of slit turquoise eyes looking back at her glittered, and Lulu lowered her hoof slowly. “Um… sorry, I forgot...”

“That should be 'Sorry, Miss Twilight',” Twilight corrected. “But I'll let it slide because it's your first day. If you were wondering where to get your uniforms from, you can pick them up at the school shop before your first lesson.”

“Right! Thanks,” Lulu said, then backpedalled. “I mean, um, thanks, Miss Twilight.”

“That's better,” Twilight smiled. “Off you go – you don't want to be late to your lessons!”

Celly and Lulu got to their hooves, turning about to head out of the auditorium.

“Do you remember where the school shop is, Celly?” Lulu asked, trying to find it on the map.

“I... think it was back near the front,” Celly replied, realizing how silly that phrase sounded, even if it made sense. The pair trotted down the hallways again, trying to remember how the school fit together. It wasn't long before they found the shop, the school uniforms hanging in the window. They were simple vests and short skirts, about as standard as a uniform one could expect, which Lulu found oddly disappointing. Celly pushed open the door, a bell ringing as they entered before they heard a voice from the back.

“Just a moment darlings!” There was a bit of shuffling before Rarity stepped out from the back room and up to the counter. She eyed the two small ponies, nodding slowly. “Ah, you need your uniforms, don't you? Step right over here and we'll get your measured in no time!” She led the two over to a rack of uniforms and a small podium, motioning for Celly to be the first up. Rarity's horn flashed as she conjured up a measuring tape that began to stretch and record Celly's measurements. While Rarity was working on her sister, Lulu was looking more closely at the seamstress. She, like Twilight, seemed oddly... puffy? Lulu couldn't figure why that was the first descriptor that came to her head, and yet it seemed perfectly accurate. Rarity just seemed like she was puffier than a normal pony. Something more akin to an oversized plush toy.

“Alright, I believe this should fit you nicely.” Rarity levitated over a top and a skirt to Celly, along with some kind of puffy pillow-like object. Celly looked it over, only to blush a second later as Lulu started her measurements.

“Is this... a diaper?”

“What's that, darling?” Rarity asked, still working on measuring Lulu. “Something wrong with your uniform? I know it's dreadfully plain to have everypony wear the same thing, but-”

“No, that's not what – that's not the problem!” Celly replied, holding up the offending item. “This is a diaper – why have you given me a diaper?”

“It's part of the uniform,” Rarity said, pausing in taking Lulu's measurements. “You know, of course, that all the pupils attending the school have to follow the dress code, and you've got just the uniform which fits the dress code.”

“It does?” Celly blinked. “I.. don't remember that in the dress code. In fact, I don't remember the dress code at all...”

“Oh, that explains it,” Rarity said, nodding. “But you have your uniform now – and well designed if I do say so myself! It should fit you just fine, snug without being tight and allowing you enough movement for normal school activity without losing that fetching waddle.”

“Fetching waddle?” Lulu asked. “That's… wait, is that really...”

“Now, now, dear,” Rarity said, smirking – her orange eyes shining, distracting both sisters. “Do you really want to argue fashion with your fashion teacher?”

“I… well...” Celly began, her gaze focused on Rarity's. “...no, sorry, Miss Rarity.”

“That's better,” the oddly-plushy white pony said. “Now, do put it on so I can be sure I got your measurements right.”

Rarity handed over Lulu's uniform as Celly wandered over to a small changing booth for a bit of privacy. She lay the vest and skirt on the counter, looking down at the cloth diaper. Even if Rarity said it wasn't very big, it certainly looked thick to her. She unfolded it, laying it on the floor as she position her rear over it. Her legs wobbled a bit as she sat down in the diaper with a 'poof', blushing brightly as it hugged her rump. She quickly folded it up, trying not to focus on how warm it was. With the buttons secured, Celly stood up, only to spot her reflection in the mirror. The diaper spread her legs a fair bit, her tail wrapped up in the fluff.

She tore her eyes away and hoped that the rest of the uniform would at least distract from the diaper around her rump. At least she wasn't the only one being stuffed into this ridiculous thing. She easily slid the vest over her chest, the skirt fitting snugly around her waist. Rarity had managed to get the measurements perfect, as much as Celly didn't really feel like admitting it considering the fluff around her butt which, upon seeing herself in the mirror again, was not hidden by the skirt in the slightest. In fact, it seems as if the diaper was accentuated by the skirt, as if the length was just short enough to make it seem all the thicker.

Celly waddled out of the changing room, Rarity gasping in delight upon seeing her. “Oh my dear, you look absolutely marvelous! I do hope it all fits comfortably!”

“Well… it fits, at least,” Celly grudgingly admitted. “And… it is comfortable, but the whole thing still makes me feel kind of awkward...”

“Yes, that is a problem with uniforms,” Rarity replied breezily. “Still, it looks good on you!”

She chuckled. “But, of course, in fashion class we'll have an opportunity to try something which fits better with your own personal colour scheme, and perhaps that'll suit you more closely?”

Celly wanted to ask whether that would involve diapers as well, but the question sort of slipped her mind as she caught Rarity's eye again.

Lulu came out of her changing room a few seconds later, some of her enthusiasm for the school day seemingly dulled down by the oddness of the uniform, and Rarity gave her a similar gasp and exclamation of delight.

“Well… I suppose if it's the uniform,” Lulu said, twisting back to look at herself. “I do think it's going to give me quite a waddle, though.”

“Oh, don't worry about that,” Rarity told her. “After all, everypony will be doing the same thing, it's the uniform – and I personally think a bit of a strut is just fine for a mare who's wearing clothes which look good on her!”

“Well… right,” Lulu blushed. “I… suppose...”

“So… what classes do we have first?” Celly asked. “Did we get our timetables?”

“I've got it!” Lulu pulled out her time table, Celly leaning over to see what their first class was. “Awww, math? That's not a good start to the day!” Lulu complained.

“It's not that bad darling, Twilight makes an excellent teacher, and counting is very important for a princess to know!” Rarity responded, waving farewell as the pair waddled out of the store.

Their rumps swayed back and forth slightly as they made their way down the halls, both of them blushing just a bit from the thought of how they must look. They quickly made their way to the room where Twilight was sitting behind her desk, looking up as they entered.

“Ah, perfect, you're just in time! Just pick out a seat and we'll get started,” she said cheerfully. Lulu and Celly looked over to see two desks in the front of the room, rest of the floor relatively barren. They sat down, Lulu dutifully pulling out her notebook and pencils as Celly did the same, flipping through a few old notes from the previous year to reach a blank page.

“Now, as we have a new student, we'll be spending a bit of time reviewing the previous material to make sure we're all in the same place before we move on to more complicated matters.

Twilight's horn glowed, shining a surprisingly dark blue color as she levitated some chalk over to the board. “We'll start off as simple as we can get.” She said, writing out “2+2 =” upon the board.

Celly stifled a grunt of annoyance. There's reviewing old material and then there's just insulting her. Her own horn glowed a bit as she doodled a little in her notebook, Twilight continuing to write down a few more equations. “Now, can anyone solve these for me? Lulu, how about you?

“Well… it's easy, isn't it?” Lulu said, sounding a bit uncertain. “It seems almost… too easy?”

Twilight smirked. “It's good to hear you're up to speed on the material. So?”

“...two plus two is four,” Lulu answered.

“That's very good,” Twilight praised. “And the next one?”

“Two times two is four as well,” Lulu said. “Can I have a harder question?”

“But of course,” Twilight replied, her eyes glittering.

She raised the chalk again, still wrapped in that oddly dark glow, and moved it over the other side of the board.

Lulu stared in disbelief as the new question took shape. It had derivatives, integrals, factorials and some symbols she didn't even pretend to recognize, and took up three rows on the board by the time Twilight finished putting it together.

“There you go,” Twilight said. “That's a bit more like the sort of level you should be at. So what's the answer?”

Lulu blinked, shook her head, and tried looking again to see if the mess of symbols had suddenly become comprehensible.

It hadn't.

“I… don't have a clue,” she admitted. “Celly? Do you have any idea?”

Celly looked up from her doodling, and did a double-take.

“Where did that come from?”

“Celly, if you could tell Lulu the answer to this one?” Twilight asked.

“But… um… n-no, I can't,” Celly admitted.

She looked down at her notebook, surprised to discover that she'd drawn a diaper, then looked back up as Twilight swept the equation off the board.

“Wait – what was the answer?” she asked. “Um… I mean, what was the answer, Miss Twilight?”

“Four,” Twilight replied, with a smirk. “Let's go back to some remedial maths.”

She swept the chalk around in a spiralling flourish, and began to write again – a little flick of the chalk after every number or symbol.

Celly looked a little ashamed that she didn't know the material, especially when the answer seemed so simple. Surely, she should have remembered that from last year, shouldn't she? She looked back up to the board as Twilight wrote out a few more equations. Her plush hooves let out soft 'pomfs' with each step that she took, which Lulu thought was a little odd, but she couldn't quite put her hoof on why.

“Here, this should be a bit easier.” Twilight punctuated the last equation with a poke of her chalk, turning back to face the class of two.

Lulu looked up at the equation, thinking that it definitely seemed easier than the one they had just been shown, but still a bit tricky. She scratched her head, trying to work it out. Celly was having equal difficulty, tilting her head slightly to one side as she stared up. “...is it... 18?” Celly finally spoke up.

“Indeed, 6 times 3 is 18!” Twilight responded, writing down another. As she did Celly found herself following the fancy flourishes and waves Twilight was slipping into her chalk-work, the numbers and symbols having a bit more flair than they did before.

“Now, 9 divided by 3?” Twilight asked.

The two sat in silence, still working this out. Lulu thought she knew this, and yet the more she pondered, the more her mind seemed to trip over itself. After several minutes, Twilight shrugged, and connected the two dots above the division symbol to turn it into an addition symbol. “Well, that is a bit trickier, taking this away is hardly as fun as adding them on, after all. Who has fun with less candy or diapers?”

She chuckled, Lulu and Celly not quite catching what she had said as they had been too focused on the last equation.

“12!” Lulu shouted out as she easily understood the modified problem, however.

“Correct! But remember to raise your hoof, Lulu!”

Lulu mumbled an apology, and Twilight wrote out another question. This one had plenty of sixes and nines, which the teaching (and slightly plushy?) pony wrote out as though they were the first turn and a half of a spiral.

“I think you should do this one, Celly,” Twilight suggested, stepping back to reveal it.

Celly frowned, looking more closely at the board so she could see the question as clearly as possible.

“Six plus nine minus six, plus nine, minus six, minus nine, plus six, minus nine, plus six,” Celly said, her eyes following each of the looping numbers around for a moment as she read it – making her blink, feeling a little dizzy.

By the time she reached the end of the problem she'd forgotten where it started, so she went back to the beginning – trying to do each step one at a time, her tongue sticking out slightly as she concentrated as hard as possible.

Twilight was smiling by the side of the board, her eyes flashing, and every time Celly got more than halfway she lost her place… somehow not able to keep track of the numbers as they went up and down.

“Try thinking of it as diapers,” Twilight suggested. “You start with six diapers...”

Celly pouted slightly, but the advice did seem to help. Now she was thinking of them as something real – as diapers – she was able to follow what was going on, and a minute or so later she tentatively gave her answer.

“Er… s-six?”

“Very good, Celly.” Twilight congratulated her. Celly gave a small smile, sitting back in her chair. She seemed to notice her seat was just a bit more comfortable, but she couldn't quite seem to put her hoof on why. It hardly mattered anyway as Twilight began to write out another equation.

“Now, this is probably a bit advanced for you, but I bet if you think very hard you'll figure it out.” Twilight wrote out a simple equation, then a graph beside it. “Now, suppose the radius of a circle is inversely dependent on how much time has passed. With an equation like this, what kind of graph might we expect?” She asked, slowly swaying her rump left and right as she awaited an answer.

Lulu pondered the question, trying to make sense of the equation. If the radius got smaller as time passed, and you start at some point, then that point should curl inwards...

“Is it a spiral?” She finally asked, after raising her hoof, of course.

“It is!” Twilight said delighted as she began to draw a spiral on the graph lines. The chalk spun around and around and around and around...

Celly and Lulu started to get dizzy as they followed the spiral drawing. Twilight continued to explain, but neither were paying much attention to her, too lost in how surprisingly deep the spiral seemed to go into the board...

Celly was swaying back and forth in her seat a little by the time Twilight finished talking, her movements following those of the slightly soft-looking teacher, and next to her Lulu was doing much the same.

“...girls?” Twilight asked, and Celly jumped. “I hope you're paying attention!”

“I, um… I was trying?” Lulu said, weakly. “But… you were saying about a spiral, weren't you?”

“That was ten minutes ago,” Twilight said sternly, making Lulu blush. “I hope your sister was paying a bit more attention.”

Celly blushed as well. “Um… a bit? I think?”

“Then you shouldn't have trouble with answering my question,” Twilight replied, smirking. “But I'll repeat it. What number comes next? Thirteen, twelve, eleven...”

“...ten?” Celly said, a little uncertainly.

Twilight nodded encouragingly, waving her hoof a little, and Celly continued. “Nine?”

“Eight!” Lulu volunteered proudly. “Seven!”

“Six,” they both said together. “Five. Four… three...”

Even though the numbers were getting simpler, it seemed harder and harder to come up with the next answer.

“...two...” Celly mumbled. “One...”

Twilight brought her hoof down, producing a clop-

-and Celly nearly walked into Lulu.

“...huh?” she asked, blinking a few times, then shook her head to wake up a bit.

“Sis?” Lulu asked, looking around and trying to blink sleep out of her own eyes. “What happened?”

“I… don't know?” Celly replied. “I thought we were in Twilight's lesson...”

She frowned, noticing that Lulu was wearing a midnight-black diaper cover, then shook it off as unimportant and looked around. There was a sign on the wall for the gym-

The gym! That was right, they were nearly late for gym class!

Celly broke into a canter, not noticing her own midnight-black diaper cover.

Chapter 2

The pair hurried up to the gym, only to turn a corner and hear a shout. “Hey! You two should know there's no running in the halls!” They came skidding to a halt, Lulu bumping into Celly's diaper at the sudden stop. Standing in front of them in the hall was Rainbow Dash, one who looked just as oddly puffy, and uncharacteristically pudgy for such an athletic pony. Rainbow Dash smirked down at them, “A little too excited for gym class. You don't even have your uniforms on!” She said.

Lulu tilted her head in confusion a bit. “What? We're in our uniforms right now!” She said, shaking her rump a bit unconsciously to prove her point.

“Sure, your class uniforms. You think you can do a triple somersault back flip double double whipless mochaccino half caf in those dresses?”

Celly was about to say she wasn't even sure she could do that even if she wasn't wearing a diaper that restricted her movement, but Dash continued before she could interject.

“Now hurry up to the locker rooms and get into your gym clothes. We only have so much time in the day!” Dash turned about, starting to waddle towards the double doors of the gymnasium, leaving Celly and Lulu to waddle into the locker room.

“Wait, how are we supposed to know which locker is ours?” Lulu asked. Celly shrugged, waddling around until she spotted a pair, each one printed with their respective cutie-marks. She opened the locker, finding a folded up uniform inside. She unfurled it, finding a one piece outfit, something similar to a one piece swimsuit, but a bit more... rubbery.

“That's a uniform?” Lulu asked. “It looks like a swimming uniform, maybe…”

“Well… I know what you mean,” Celly admitted. “But if Rainbow Dash says they're what we should wear, I guess that's what we should wear?”

She frowned. “Do we take the rest of our uniforms off?”

“I'm… hm,” Lulu replied, thinking about it. “Well, we need to take the skirts and the vests off. But the… well, the diaper?”

Celly thought about it. “Maybe… maybe we should try with the diaper, and then if it doesn't fit we should try without?”

“Why not the other way around?” Lulu asked.

“It'd take too long to retape the diaper if we guessed wrong,” Celly replied, frowning for a moment before nodding to herself.

That seemed to make sense… right?

She took her skirt off, then the vest of her uniform, and hung them both up before levitating the rubbery-seeming suit with her magic and starting to put it on. It was stretchy enough that she didn't have much trouble fitting into it, though the elastic-y rubber-y pressure it produced on her diaper felt snug and oddly pleasing.

When she stood up to check how it looked, there was a loud squeak which made her flush slightly – though she couldn't avoid a giggle when the same thing happened to Lulu.

Lulu blushed and stuck her tongue out at Celly, stuffing her normal uniform into the locker. The two headed out of the locker room into the gym where Dash was waiting.

The pony was setting up some miniature trampolines, bouncing a little bit on one of them to get a feel for it. "Alright, you two ready? Or did you forget to stretch too?"

Celly looked a little sheepish, embarrassed she was forgetting so many things today. Lulu was equally embarrassed, though she was still focused on the feeling of her suit squeezing her diaper.

"You can't get ready without stretching, you know! Things grow the biggest when they stretch first!"

Dash stood on her hind legs, reaching into the air. "Come on, we'll start with the simple ones. Reeeeeaaaaach up!"

Celly and Lulu carefully balanced on their hind hooves. Not an easy task given the bulk of their diapers. They stretched upwards, suits letting out several loud squeaks and creaks.

"aaaaand, down!"

Dash bent over, reaching for her hooves and shaking her butt around.

Deciding it was better to do just what Dash suggested than to get it half-wrong, Celly and Lulu shook their own crinkly butts around to copy her – producing a chorus of squeaks and creaks.

“That's more like it!” Dash told them. “Now, do that again!”

She got to all four hooves and watched as they repeated the squeaky, creaky stretches, then nodded. “Great! Next, you have to go on all fours and lean forwards with your back legs – with your wings out and your front legs forwards. Then you reverse it, bending down so you put your head down and your hips up – but all without taking a hoof off the ground!”

She demonstrated, stretching first forwards and then back. The forwards movement looked fairly normal, but the backwards movement stuck her diaper out and she took the opportunity to wiggle it back and forth.

A little hesitantly, Celly and Lulu both followed along. Once again they did the full stretch – forwards, then back, complete with a crinkly wiggle at the end.

“There you go!” Dash announced. “Now, let's get on to the actual exercise! Ready by the trampolines!”

Celly and Lulu each stepped up to their respective trampolines as Dash took her position in front of them. “First up, some bouncing!” Dash said, jumping up onto the trampoline. She bent her legs a bit upon landing, building up a steady rhythm of bouncing upon the stretchy material. It wasn't enough for her to become airborne, but she slowly oscillated up and down in front of them as her tail swished back and forth. The two fillies each hopped up onto the trampolines, Lulu stumbling ever so slightly from the lack of support. The trampoline was much less taut than she had expected, sinking down towards the floor. Both of them carefully shifted their weight and bent their knees, getting into the same beat as Dash in front of them.

“And up! And down!” Dash said, jumping a few inches into the air. Celly and Lulu followed, their legs wobbling upon landing a bit as they got used to the trampoline's surface. “And up! And down!” Dash repeated, jumping up once again. Celly and Lulu continued to bounce, slowly becoming more and more adept. It became easier the less they thought about trying to land properly and just letting themselves enjoy the simple pleasure of bouncing up and down. Listening to Dash's repeated commands certainly helped as well, only needing to do what they were told, and not need to worry about why they needed to. Up and down. Up and down. Up and down.

Dash grabbed her hind legs, starting to bounce her butt on the trampoline, which Celly and Lulu mirrored perfectly. Their diapers sank deeper into the trampoline as they bounced higher, giggling to themselves as their rumps were squeezed with each landing.

Up and down.

The sisters bounced and crinkled, finding it easier and easier to lose focus.

Up and down.

Learning to exercise in a simple, fun way, one which made the best use of their crinkly diapers.

Up and down.

Listening to exactly what Rainbow Dash had to tell them in their lesson.

Up and down.

How they had to listen to the pony who was teaching them, and how they had to keep bouncing.

Up and down.

Dash was talking about other things, as well, but Celly couldn't hear them very well as she bounced

Up and down

Lulu was having trouble keeping track as well, and she didn't see much reason to do anything other than just bounce

Up and down

Up and down…

Enjoying it more every time they bounced up, feeling the plush squeeze of the diaper, and anticipating when they would go

down

and become more and more scattered, finding it so hard to focus, so easy to just do what Dash said… to take in what Dash told them…

up and down…

“Great!” Dash told them brightly. “You really got up to speed with what we were doing! I'm impressed!”

“I, um… huh?” Celly blinked, finding herself on the floor of the gym – still bouncing up and down a little, her diaper wiggling in sympathy with her movements. “I… don't really remember a lot of the lesson...”

“Nah, that's fine,” Dash waved off, smirking. “It means you're really focusing properly on the workout, not bothering to do something silly like remember all the details...”

Celly and Lulu continued to bounce in place gently, their diapers crinkling as their suits squeaked with each wriggle and squish. “Now, let's move on to the acrobatics unit!” Dash said proudly, trotting over to a set of ropes, trapezes, and balance beams that Lulu certainly didn't remember seeing when they had first walked into the room. Dash took her place at the start of the course, showing off everything. “You should already know what to do if you were paying attention during our last exercise, so just get started and I'll grade you on your performance!” She said, smirking just a bit. Both Celly and Lulu looked at each other, their bouncing slowing just a bit. Neither of them remembered what it was they were going to be graded on, and the course looked horribly daunting. “Lulu, why don't you go first?” Dash suggested.

Lulu jumped a bit before she got to her hooves, waddling over to the course. The first part was a balance beam over what looked like a shallow ball bit, and Lulu gulped. “Alright, remember, time's part of it too! But finesse comes first! And... go!” Dash said.

Lulu climbed up the steps to the balance beam, waddling out onto it. She wobbled in place, the poof of her diaper doing nothing to help her. “Alright, show us a prancy pony!” Dash said. As she stood wondering what in Equestria she was supposed to be doing, she suddenly had the urge to try a flip. She had no idea why, she was sure if she attempted it she'd fall into the pit below, but…

Lulu found herself standing on her hind hooves, legs pressing snugly into her diaper to stay on the thin beam. She bent down before pushing up, spinning in the and landing expertly. “Nicely done, Lulu!” Dash congratulated her. “Show us another prancy pony!”

This time Lulu did a slightly different move, adjusted for how she was stood on the beam, and flipped over before landing with a squeak, creak and a thump of her hooves against the bar.

It felt… just so natural to do it. Dash's words were just athletics jargon, right?

...but it was jargon she understood on a deep level, for some reason, so…

Lulu shook her head, wobbling noticeably on the beam, and resolved to focus on what she was doing rather than try to think about silly thoughts that would distract her.

“Let's try something a bit more ambitious!” Dash said. “A fantastic frilly flash!”

The name of the move made Lulu blush, but she was already doing it – balancing on one hoof, shaking her rump back and forth, and flaunting her crinkly diaper to an invisible crowd.

It made her feel like she was doing exactly what she was supposed to, regardless of her blushes, and she felt proud about it…

...as, watching, Celly felt some apprehension about the idea of doing just the same things. Along with more than a bit of jealousy, as well – she felt like it would clearly be enjoyable to do just that, to do her own gymnastic moves.

All the same, she didn't really have any idea what those moves were… she could see Lulu performing them very easily, but she just didn't know how she'd do them herself.

“And dismount!” Dash called, and Lulu jumped off the end of the beam before bouncing once on her diaper and coming to a stop with a crinkle-squeak. “Great! Now, your turn, Celly!”

A little uncertainly, Celly stepped up onto the beam.

“Now, first up, let's see a prancy pony!” Dash called.

Celly tried to copy what Lulu had done, tripped, and fell straight into the ball-pit with a rustle of plastic balls.

Her head broke the surface of the balls and she swam awkwardly to the edge of the pit before hoisting herself up out. “Oof, sorry Celly, but I think Lulu's won the first act.” Dash side, not doing a very good job at hiding her smirk. “Alright, Lulu, next up is the trapeze!”

Lulu eagerly hopped forward, looking up at the ladder to the platform where the trapeze bar hung. She started her climb, her butt swaying back and forth and showing off to Celly who was waiting below. Lulu reached the top, grabbing the bars with her hooves as she glanced back down at the ponies below her. Her heart dropped into her stomach as she realized just how... high... she... was...

“Alright, Lulu! A swirly spiral!” Dash shouted up to her. Lulu nodded, and jumped off the platform. She swung through the air, but as she approached the second bar, the squeaky rubber of her exercise uniform suddenly slipped, and she lost her grip. She spun a couple times before landing in the net below the bars, bouncing up and down several times before coming to a rest, catching her breath.

“Tsk tsk tsk, that won't be any points for you Lulu. And such a shame after your last performance! You're up, Celly!”

Celly started her climb as Lulu did her best to try and climb free of the hammock like net. It was a lot harder than it should have been, and she was still struggling as Celly took her position above her.

“Celly?” Lulu called up. “Can you try not to fall off?”

“I wasn't exactly planning on jumping off,” Celly replied, a bit tartly.

“Okay, Celly, let's see how you do!” Dash instructed. “Do a swirly spiral!”

Celly pushed off from the platform, and began to spin through the air around her trapeze bar. It seemed that she was finding it much easier than Lulu did, and indeed easier than she'd found it on the balance beam… she held on easily, the lights at the top of the room glittering off the shiny material of her uniform and throwing highlights in all directions.

She went around and around, faster and slower, noticing in the back of her mind that she was going up and down again – slowing down as she went up, speeding up as she went down, so she felt like she spent more time sinking than she spent rising.

It made her feel all dizzy, giggly, but when Dash called for her to transition into a trapeze trance twirl she did it with flair – and a squeak-a-creak-a from her uniform as she flipped from one trapeze to the other, setting it swinging as she held on with her hind legs before transferring to her forelegs with another natural-seeming flip.

Lulu's eyes sparkled as she watched Celly effortlessly swing and swirl and spiral in the air, drawing her attention like a moving spiral or like a giant pendulum… making her yawn and blink, finding it harder than she expected to focus…

Celly's suit creaked as she spun and spun and spun, her eyes closing as she focused on the sensation of spinning, imagining she was sinking lower and lower, traveling down a slide ever deeper.

“Alrighty, now dismount!” Dash shouted up.

Celly let go of the bar without even opening her eyes, somersaulting several times before she landed on the opposite platform, striking a pose proudly. She opened her eyes, and stumbled back ever so slightly when she realized what she had just done. “Nice work, Celly! Top marks!” Dash said, trotting over to the next act. Lulu had finally managed to climb free of the hammock, Celly riding a slide down from the top of the platform and bouncing along on her butt when she reached the bottom.

They stepped up to the next act, two rings hanging from ribbons above an inflatable cushion. Lulu was ushered forward by Dash, climbing atop the cushy inflatable mattress. Her hooves sank into the material, causing her to sway and stumble as she wandered to the two rings. She wrapped her hooves around the rings, hoping she would be able to impress Dash with the next act again. “Now, show me a frilly filly flaunt!”

Lulu hoisted herself up into the air, lifting her her hind legs up carefully. She began to swing back and forth, showing off her diaper as she pulled the rings below her, doing a hoof-stand, shaking her butt left and right before dropping down and catching herself with her hind hooves, swinging forward and backwards on the ribbons.

Celly watched in amazement, wondering when Lulu had learned to do all these tricky moves, as her sister adjusted her grip slightly to make her sway left and right a little.

Admittedly, she wasn't sure when she got so good at the trapeze, but…

“Great start!” Dash praised. “But let's see if you can pull off a ribbon ring rave!”

Lulu paused for a moment upon hearing the words, then began what could only be a Ribbon Ring Rave – spinning around three times to twist up the ribbons, then letting them unspool and spinning her around faster. Her diaper stuck out a bit as she spun, and when she reached the end of the twirl she switched so she was using her hind legs to hold onto the rings and facing down towards the mattress below. Her horn was just above the inflatable material, and Celly held her breath as she wondered whether Lulu would pop it – but then the ribbons twisted up again, pulling her higher and raising a storm of crinkles as they compressed her big crinkly diaper in the ribbons and the rings.

It looked very impressive, but also very confusing… Celly could barely keep track of what Lulu was doing, let alone how she was doing it! But she didn't feel like trying, interested in just watching – and relaxing…

It was so easy to just watch Lulu spin around on the ribbons and the rings, alternately squeezed by the ribbons and rings and then dropping lower towards the mattress – until she flipped over to face back towards the ceiling, her crinkly rump now the thing closest to the mattress.

Rainbow Dash grinned widely as she watched Lulu perform, clearly quite proud with her stunts. “That's enough, Lulu, we have to give Celly a chance now! Dismount!” Lulu continued her spinning, the ribbons squeezing and squishing in on her tightly before she finally let go. She landed on top of the inflatable mattress, her diaper spiraling down into it from her momentum before it sprung her back up into the air. She waddled off, her eyes spinning as she seemed to suddenly realize just how dizzy she should have been. Celly took her place where Lulu had been, who was still stumbling around just a bit.

“The same as Lulu, Celly. Let's see a frilly filly flaunt!” Dash requested. Celly nodded, trying to hoist herself up with the rings. She immediately let out a squeak of surprise, finding even that part of the task to be difficult, let alone what else was required of her. She closed her eyes, puffing her cheeks out a bit as she lifted herself higher, Dash shaking her head a bit. “Really, Celly, you should lay off the sweets!” she said.

Celly tried her best, but eventually her hooves gave out and she flopped onto the mattress. She sank in further than she had expected, and with a cartoonish boing!, she was bounced up into the air. Her legs flailed instinctively, grabbing at the ribbons hanging beside her. Before she could come back down, her hind hooves had slipped through the rings, riding up to her flanks. The rings squeezed her diaper, and Celly fell back into the mattress before flying up again. She grabbed onto the ribbons, whimpering as she was bounced up and down.

Any questions Celly might have had about how she could even reach the mattress were lost in her general dizzy bouncing and confusion, feeling her diaper squished and squashed and squeaked by the rings and the mattress and the suit she was wearing.

She tried to hoist herself up out of them again, but that didn't seem to help – it simply unbalanced her, making her twist around and spin a few times, and the ribbons pressed closely in on her diaper as she got herself tied up in knots – each tangle tying her up more than the last, constraining her movement and in an odd way making it harder for her to think…

Celly found herself swaying gently back and forth, tied up in ribbons so thoroughly she had no clue how she could escape, and Rainbow Dash shook her head.

“Dear me, Celly!” she chuckled. “You're all wrapped up like a Hearthswarming present!”

The pegasus raised her soft hoof and poked Celly a couple of times, then did something and untangled her in a blur of rainbow light.

Celly found herself sat on the bouncy mattress, wobbling gently up and down, and shook her head a couple of times before the swirly blur of rainbow went gradually away.

“Now let's see how you do on the fourth and final gymnastics challenge!” Dash announced. “The balance balls!”

Celly and Lulu followed her once again to two small exercise balls, one a bright white and the other a deep blue to match Celly and Lulu's coats. “Up you go!” Dash commanded. Just as before, the two ponies trotted up to the awaiting performance piece, both of them placing their front hooves on the ball. “Just a simple bouncy balancing.” Celly jumped up onto the ball, her hooves sinking into the material with several creaks and squeaks of her suit. She balanced with ease, posing proudly. Lulu, on the other hoof, was wobbling back and forth atop her ball, her hooves stumbling around as she tried her best to stay on top of the ball. “See? It's just like the trampolines! Now a butt bounce!” Dash said, making a few marks on her clipboard.

Celly bent her legs, the ball bulging beneath her as she jumped into the air. She landed a few times on the ball before twisting a bit, landing on her padded rump. She giggled as her diaper squished the ball beneath her, and in turn squeezed her diaper. She was soon bouncing rhythmically up and down, looking over to Lulu.

Lulu didn't dare bounce, her balance was already so weak she was sure she was going to fall off of the ball any second. She glanced up to Celly, cheeks burning with embarrassment and jealously as she saw how easy Celly was bouncing, and just how much fun she looked like she was having. She tried to bounce, but only wobbled before flopping onto her ball, hooves spread wide. She squeezed the ball between her hooves just a bit... was it... bigger than it had been before?

“Um...” Lulu began, trying to draw attention to what she'd noticed, but the ball wobbled again – making it so she had to concentrate much more on not falling off, her hooves waving wildly and her suit squeaking aplenty.

Celly was having none of the same problem, bouncing on her rump before shifting her weight to bounce on her front hooves and waving her rump in the air.

“That's great, Celly!” Dash told her. “Just like that! Now let's mix it up a bit with a rump roll!”

Following the instructions, Celly began to run in place on the ball – making it so it began to slowly move about – and paused every few seconds to bounce butt-down and adjust her movement.

Each time she bounced, she went a little deeper into the ball – but she also sprang up higher than before, the ball itself getting just a little big bigger. Oddly enough, that didn't bother her… it just seemed like part of using the balance balls. After all, didn't it make the challenge slowly increase?

Lulu would have been quite happy for the challenge to not increase, and her attempt to do the same resulted in her ball wiggling backwards erratically as she tried her best to maintain her position on top of it. Her frantic hoof-wobbles were interrupted after a bit as she hit the wall of the gym rump-first, producing a bounce-off and a squeak-creak, a yelp of surprise and a loud booing-poing-oing as she bounced off her ball several times… leaving it much bigger than before.

Lulu whimpered as she wobbled, gripping the ball as it rolled forward, smothering her only to maintain its momentum and continue to roll, lifting her back on top of it. Celly bounced circles around her, flopping down into her ball and sinking almost completely into it. She gave it a tight squeeze as it distended before rebounding, sending her bouncing up into the air. Lulu looked up and had just enough time to let out a whine before Celly's ball came down top her, smothering her between the two rubbery surfaces. Celly's hooves wobbled as she had to adjust her balance a bit now that she was top two spheres. She peered over the edge, seeing Dash's encouraging smile below her, and grinning widely herself. She restarted her bouncing, letting herself sink deeper and deeper into the swollen material. The two balance balls inflated even further, muffling the helpless pleas of Lulu trapped between them. The swollen surfaces pressed tightly into her, squishing her muzzle and rubbing her diaper as they ballooned outwards.

Celly bounced higher... and higher... and higher! With each bounce she was practically swallowed whole by the overblown orbs, Dash quite happy with Celly's performance. Celly didn't even seem to notice Lulu's disappearance, too focused on the good feelings of vinyl and rubber squishing her, and how much fun it was to bounce!

She lost track of time a bit, bouncing and bouncing as Dash called out increasingly elaborate tricks for her to do – some of them with names so long she sort of got bored before the end, but which she could clearly do because she was able to pull off move after move!

Bounce, creak, squeak! Up and down, squished and released, the rhythms pulsed in her head and around her body… until something changed.

There was a ssssssss noise, echoing in the air, and for a moment Celly squeaked – wondering if that meant she'd gotten so confused that she'd managed to wet her diapers… until she realized she could feel something happening, and it wasn't that.

Instead, the air was slowly leaking out of the big bouncy ball she'd been balanced on… and leaking into her exercise suit, making it slowly puff up and inflate.

Celly lifted one hoof away from the ball, then another, trying to find where the leak was coming from, but it seemed just impossible to locate it as more and more air hissed into her suit from the ball and the unseen air leak.

Below her, Lulu found the same thing going on – only with bouncy balance balls on both sides, the air leaked into her suit faster than it was with her sister and her sports outfit was getting larger and larger faster and faster….

Dash continued to praise Celly as the two bouncy balls deflated, and before long Celly was wobbling atop a terribly inflated Lulu. The smaller alicorn's suit squeaked with every hoofstep from Celly atop her, who was having a bit more trouble maintaining her balance with her now bigger suit. “That wraps up our lessons for the day. Remember to stay bouncy, a fit princess is a good princess!” Dash said before turning to waddle off and leaving the two to return to the locker room. Lulu grunted a bit as Celly jumped off her, rolling her towards the door.

“Come on, Lulu! We're going to be late for our next class!” She said. Lulu tried to retort, but her quips were muffled by her own swollen suit as her head was smothered and she rolled along. Their progress was momentarily paused as Lulu became wedged in the doorway to the locker room, but several big shoves from Celly managed to squeeze he through, sending her bouncing off the wall.

“Celly! Stop rolling me around and find a way to get this thing off!” Lulu begged, wriggling her hooves uselessly.

Celly blinked, and, as if seeing Lulu for the first time, she gasped. “Oh goodness, I'm so sorry Lulu! I'll get you out, don't worry!” She scanned Lulu's outfit, trying to find a way to deflate it, all the while wobbling unsteadily as her own hooves had to be swung high into the air to compensate for how widely they were spread by her own air filled onesie.

“I don't know...” Celly said, after several long minutes of thought. “I just can't seem to think of anything we have which would let us deflate the suit. I can't find any sort of nozzle...”

“Come on,” Lulu groaned. “Really? Is there really nothing?”

“Nothing I can see,” Celly answered. “I'll look closer, though.”

She bent in further, inspecting Lulu's air-filled suit a bit at a time, wiggling as she moved herself clumsily sideways to look at the outfit a bit at a time.

Lulu wiggled. “Can't you do this any faster?”

“I'm doing the best I can,” Celly protested. “I think there might be something by your neck, though...”

She leaned in closer still, inspecting the astonishingly airtight material of the gym-class outfit to try and find the place it was supposed to be deflated-

BANG!

Both suits exploded at the same time, leaving Celly wide-eyed and staring and Lulu stumbling backwards before falling on her crinkly rump.

“What just happened?” Lulu demanded. “That was-”

“Pardon?” Celly asked. “I can't hear you!”

“What?” Lulu replied.

Celly reached a hoof up to try and get a scrap of pierced fabric off her horn. “I can't hear what you're saying, Lulu! Speak up!”

She managed to worry the fabric free of her horn and frowned, wondering why the suits had suddenly vanished, then stretched – enjoying the relative freedom of only wearing her school uniform. “Let's head to the next class, we'll be terribly late!”

“What?”

Celly simply rolled her eyes and took her sister by the hoof to lead her down the hallway. She rummaged around in her saddlebags to pull out the schedule. “Oh good, band's next, that's not too far away.” She said, tugging Lulu along behind her.

Lulu's hearing was slowly returning as she waddled along behind Celly, though she couldn't be entirely sure it was either. There was an odd... ringing still there. Though as Lulu thought about it, it didn't seem quite like ringing. It was a much fuller sound, one that reverberated through her head, and grew steadily louder both as her hearing returned, and the two approached the band room.

Celly and Lulu were too excited about getting to their class neither really thought about the fact that they didn't play an instrument. In fact, had Celly bothered to think about it, she didn't even think she had spent time in choir like Lulu had.

The odd droning continued to echo down the halls as the pair stepped up to the large double doors to the band room. They stepped inside, only to be met by a rather peculiar sight.

Another oddly too-puffy-appearing pink pony was standing on the conductor's podium, waving a baton around as she slowly swayed her rump left and right. What was more odd was the uniform she was wearing. It looked a little bit like a formal dress, if one stretched the definition of the word 'dress' as much as the material of the dress was. Bright and plaid, it hugged the conductor's form, and seemed to be at least partially the source of the odd sound echoing all around.

Celly raised her hoof. “Ah, er, excuse me?”

“Oh!” the pink pony performer said, smiling brightly. She stopped waving her baton around, but kept swaying her rump back and forth, and the droning sound continued unabated. “You're kinda late, but that's okay – we'll just have to do some recap!”

“I suppose so,” Lulu said. “I hope we haven't caused too much disruption?”

Neither she nor Celly were at all bothered by the total lack of other ponies in the class, the absence seeming simply unimportant.

“That's not a problem!” the teacher said. “By the way, my name's Pinkamena, but everypony calls me Teachy Pie! Or Pinkie, I guess, that works too, I'm a modern teacher.”

Celly frowned, then caught Pinkie's eye.

Cool, aqua, and definitely slit, it captivated her for an endless moment… and when she blinked and looked away, she didn't have any problems left at all with her teacher.

“So!” Pinkie said. “What kind of instrument do you girls play?”

“Well, ah… I'm afraid I don't know what would be best,” Celly said, feeling dizzy in general after her eye contact.

“Then I'll get you started on my yovidiaperphone!” Pinkie replied. “It's like a yovidaphone, but it's much better because you can wear it!”

“That's… quite a mouthful,” Lulu admitted.

“That's okay, you can just call it a bagpiaper if you want,” Pinkie said.

She jumped down from the podium, landing with a paarp-bounce on her rump, and the sudden blast of notes made both young alicorns stagger – feeling dizzy, for a reason neither could really place.

“Ooh, I know what colours would suit you!” she added. “Just a tick!”

Pinkie zipped away far more quickly than either pony would have thought possible, and returned just as fast. She was holding a deep purple mass of cloth in one hoof, and a crimson puffy bulge in the other. “Alright, get your instruments on so we can get practicing!” She said, dumping the instruments onto the respective pony.

Celly shook out her yovidiaperphone, trying to figure out which end was which. She eventually figured the more bulbous side must be the one around her rump, and a zipper running down its belly. She started to slip into the outfit as Lulu did the same, although she took a bit more interest in the line of pipes that ran down the back of the outfit not unlike the spines of a dragon. The seemed to lack any sort of holes, which only made Lulu wonder how Pinkie was expecting them to play any kind of complex piece of music with this. Those thoughts quickly faded away as Pinkie sat down again and let out a long drone of music. The two ponies were soon suited up in their yovidiaperphones, feeling the soft material hugging them comfortably.

“So... now what?” Lulu asked, looking herself over.

“Heehee, simple, silly! Just lift your rump up and-!” Pinkie dropped her butt to the ground, the pipes letting out a wheezy wail, and Pinkie giggling as she hugged her puffy plaid suit.

“That sounds...” Celly began, then her words slowed as she thought… it sounded something, but her first reaction seemed much less certain than she'd thought it was, and a moment later she couldn't even remember what her first reaction had been in the first place.

The music did sound nice, and she had to admit that she'd been meaning to learn an instrument one of these days…

Lulu was the first to give it a go, lifting her rump up a bit with the purple-black yovidiaperphone rising up with it – then she dropped her rump again, resulting in a wonderfully parpy sound which was deep and rich and nuanced.

“D-did I do that?” she asked, gasping. “I didn't know I could...”

“That's why a yovidiaperphone is such a great instrument!” Teachy Pie explained with a giggle. “Give it another go!”

Lulu raised her rump again and brought it down, producing a whole new symphonic-seeming sound which hung in the air and echoed around the room.

“You try!” Pinkie added, turning her attention to Celly, and the other sister lifted up her own bagpiaper with a wiggle.

“I'm not going to be as good,” she said, and Pinkie tutted.

“No, no, no!” she said, leaning closer with a smile – catching Celly's eye with her own again. “You've just got to believe you'll be good at it, and you will!”

Celly blinked, feeling woozy, and nodded – then she sat back heavily, landing with almost all her weight on her puffy instrument.

The blast of sound she produced wasn't quite so melodious as Lulu's, it was true, but it was louder and longer and just as compelling to listen to.

“That's right!” Pinkie giggled. “Now, let's try doing it to a beat!”

Celly dropped her rump to the floor to let out another loud wheeze, and she started to bounce in place. The beat wasn't quite exact, and her wheezes were much softer now that she wasn't putting her full weight behind each note. Still, she was building a slow rhythm, which quickly picked up in energy as she grew more comfortable with playing the instrument. She squeezed the pearl accented crimson yovidiaperphone, smiling as it blared out another set of notes. Lulu was swinging her rump left and right subconsciously as she listened to Celly play. She started to squeeze her legs together in time with Celly's bouncing, accentuating her sister's song with her own tune. Pinkie clapped her hooves happily, bouncing on her own butt to join in the melody as the students played.

“Now for something a bit more complex!” Pinkie said, hopping over to the chalkboard at the front of the room. She doodled up two ponies in respectively puffy yovidiaperphones bouncing their butts together. “If you combine your puffiness, the tune will be even more energetic! And the more energy in the song, the harder it is to think about anything else!”

Celly and Lulu stopped their playing just long enough to allow Celly to get back to her hooves. The two swung their rumps apart, only to swing them back and smack them together. They let out a loud 'paaaaarp!' as their butts collided, causing the two to giggle excitedly at the sound.

“Ooh, that looked great!” Pinkie cheered. “And it sounded even better! I bet you two could have a special sister rump bump spectacular!”

That sounded like a great idea to both Celly and Lulu, not that they could really focus on anything else in any great detail, and they put just as much energy into a second big dual-pony bagdiaper oomph-a.

Pinkie began bouncing on her own instrument again to give them a backing beat, then began to speak – not quite singing, but keeping her voice to the rhythm of the beat as the parp-tastic music pulsed through the room. “That's right! Keep it up! Now, let's try dynamic range!”

She giggled. “That means you put more force into the notes when you want more feeling! And the best way to do that is to not just bump, not just thump, but jump!”

Celly was the first to try that, copying her earlier opening move of putting all her weight onto the yovidiaperphone. The note which echoed out was louder, fuller, more insistent, and it did just as Pinkie suggested and made it even harder for either sister to think about anything but making the song sound just as good as it could be.

Lulu followed suit, this time actually jumping to land with the assistance of gravity, and if either Celly or Lulu had been trying to maintain a steady footing the musical pulse alone would have made their heads spin. But as it was it just made it easier to play more, louder, longer…

Celly and Lulu landed opposite each other to the beat of the song, Celly flying up into the air as Lulu came down with another loud parp! Pinkie bounced herself over the cabinet, rummaging around inside as the two played on. They jumped up, starting to parade around the room as they played, not paying much attention to Pinkie as she lifted her rump up and down in time to their bouncing and adding in her own accents to their tune every now and then. She eventually pulled herself out of the cupboard, holding several instruments in her hooves as she bounced back to the center of the room. “Keep going, girls! You're playing excellently! We're going to learn how accompaniment works now! After all, a yovidiaperphone is fun, but just think of how good you'll sound with all these other instruments drowning out...” The rest of Pinkie's words couldn't really be heard by the two fillies, with just how preoccupied they were with their playing. Their attention was finally diverted when a loud crash could be heard. Celly stopped, Lulu bouncing into her before turning to look to see Pinkie crashing a pair of cymbals together again, still bouncing up and down on her rump. “Come on, get a closer look!” She said over her own music.

Celly was the first to get moving again, able to approach while Lulu was still bouncing up and down from her landing. The white alicorn kept bouncing and playing almost unconsciously as she waddled closer, instrument swaying from side to side with every clash of the cymbals – until suddenly she was too close as Pinkie moved forwards with a giggle, and the cymbals clashed together on top of her.

Strangely she felt mostly a bit dizzy from the experience, popping back to her normal size after being briefly squashed – but had that really happened? It was such a strange experience that Celly decided to ignore it entirely, and giggle instead as Lulu got herself into almost exactly the same predicament with a parp-honk-crash.

“That's right!” Pinkie told them. “Feel the music move you – you don't need to think if you can just feel where it's taking you!”

She pulled out a set of extra-length horns, each for a different note, and Celly bounced down to land on one of them. Pinkie blew into that one, then the next one Celly landed on, and played her back and forth until she bounced off with the horn notes ringing in her ears and giggled, rolling backwards as the song reverberated through her head.

Lulu was inspecting a set of mutes, when she was suddenly bumped from behind by Celly. She fell into the shelves, the mutes falling down into the pipes on her Yovidiaperphone. The song from her pipes were muted slightly, and with each bounce, her instrument swelled. She squeezed her gut, blushing as it grew around her. She tried to reach around to her pipes, but her suit was too bloated to allow her to wrap her hooves around them. She whined as her suit wheezed, stilling swelling slowly bigger.

Pinkie bounded over, pushing a large chime down over Lulu's head, which was being slowly swallowed by her yovidiaperphone. Pinkie took a mallet and smacked it against the chime, causing it to ring and Lulu's body to quiver. Pinkie removed the chime, but Lulu continued to vibrate and shake, letting out a whine as her suit rumbled around her, the clear note of the chime echoing in her ears.

“Sounds like it's time for us to build up to a grand finish!” Pinkie said, clearing a space across the room with a sweep of her cushy pink rump. “Ready?”

Celly nodded, getting to her hooves, and was about to take a step forwards when Lulu landed on top of her.

“There we go!” Pinkie announced, and two big drums came crashing down from the ceiling. They landed either side of the two filly alicorns, and Pinkie jumped on top of one and then the other to hold them both in place at once.

“Drumroll, please!” she called, and – true to her word – began rolling the drums.

Celly staggered sideways into a drum and bounced off with a resonant boom, her yovidiaperphone unleashing an echoey parp as she did. That impelled her to bump into her sister, and her sister to bounce rump-first into the other drum with just as loud a parp and boom and just as big a bounce.

Bounce, boom, parp, bounce, boom, parp, the sisters picked up speed and bounced faster and faster as the drums rolled from the back of the room towards the stage at the front. There was a pair of cymbals there, ready and waiting, and they knew what was coming…

...and the drums rolled right up onto the stage bouncing the alicorns between them, as Pinkie jumped from the drums to trigger the cymbals. There was a mighty crash, and Celly and Lulu were sent wobbling out the door with their Yovidiaperphones trumpeting as they deflated – music flowing through them and making it almost impossible to think of anything else.

“Ta-ta!” Pinkie giggled. “See you! Remember your lesson! Don't forget that night is best!”

Chapter 3

Celly and Lulu waddled back and forth, each trying to maintain their balance as the bulk of their yovidiaperhpones disappeared, turning into colorful vests for their school uniforms. Celly was the first to recover, looking down at Lulu's deep blue vest. “Oooh, Lulu, your vest is so pretty! Pinkie was right, night is the best!” She grinned, admiring her sister's uniform. Lulu shook her head, coming back to her senses.

“Oh um... I suppose it is. I still think yours looks better. It's so bright and colorful,” she replied. Celly shrugged, pulling out their schedule.

“Well, it looks like cooking is next. Maybe you can spill some frosting on your vest and make it brighter.” She teased, heading back down the hall. Lulu followed, both of them soon making their way into their next class. Rather than a standard classroom, this one was lined with miniature ovens and refrigerators. Standing in front of one of the ovens was another puffy pony, her orange rump shaking left and right as she pulled out a piping hot apple pie.

“Howdy girls! You're just in time for our sample for today! Ah've got just the thing for a couple hungry fillies!”

It was when the sweet aroma of the pie hit their noses that both ponies realized just how hungry they were, eagerly stepping up to take a slice.

“Well, now, looks like you like that there apple pie,” the puffy pony said, her smouldering red-and-yellow slit eyes watching with amusement as Celly and Lulu took their slices of pie – slathered with cream, of course – and sat down on the chairs with a crinkle to begin digging into them. “Name's Applejack, though if you feel like bein' fancy you all can call me Miss Applejack. I ain't gonna insist though.”

“This is… mmmf, wow!” Celly said, licking her lips. “I thought cake was better, but this pie is just… amazing!”

“Cake, hey?” Applejack asked, resting one hoof on the nearest counter and crinkling idly. “Well, ah might not mean t'boast, but there's some mighty fine cakes you can make here in home applenomics… just like y'all could fritter away the time making some right bewitching fritters, or any other kind of apple product that comes t'mind. Don't that sound like it beat all?”

“It… does sound really tasty,” Lulu agreed. “But… are they all apple?”

“Well, now, seems to me like that's a challenge,” Applejack smirked. “And if you girls want to have more after that sample, seems to me it's time that y'all get to cooking!”

Lulu looked down with disappointment to see that the pie was all gone, and licked her lips – quite ready to have another entire pie, let alone a slice.

“Don't worry none,” Applejack added. “If y'all do your work well, ah'll see about letting you have another slice while you work.”

Celly let out a soft burp as she finished her pie, patting her belly happily. “Ooh, if I could make something even half that delicious...!” She sat up straighter in her chair, watching Applejack attentively. The pony chuckled, clearing off the counter that the pie tin was on and lifting up two thick recipe books.

“Well then, we should get started 'fore you all think about gobblin' me up!” She handed the cookbooks to the ponies before she began to retrieve several ingredients from the cupboards. “We'll start with a visual demonstration, so y'all get an idea of how to bake 'fore we throw you in the deep end.” She dropped the ingredients onto the counter, picking up her own copy of the book. “We'll start with some baked apple, and make sure you pay very close attention!” She urged.

Lulu flipped to the appropriate recipe, looking very closely. The recipe seemed simple enough to start with. Just some cored apples, peanut butter, chocolate chips, and cinnamon for flavoring. Each step was accompanied by a photo to show how one should cook the apples, filling the cores with the peanut butter, chocolate, cinnamon mix, and how to serve them as well.

As Lulu read along, she realized she hadn't really been listening to Applejack's explanation, so she quickly looked up to see her holding a tray of neatly cut apples, offering out more samples. Celly and Lulu took some, finding them to be just as good as the pie they had eaten. “I hope you got all that, it's your turn to make some sweets for each other to try!”

Celly huffed slightly, then sighed and shook her head.

“I suppose I can live with that if Lulu is making sweets for me… even if I'm going to be making treats for Lulu,” she teased.

“It seems fair to me,” Lulu agreed with a chuckle. “Now… what are we going to be doing, Miss Applejack?”

The plushy farm-pony turned over a few pages in her cookbook. “We're making these here apple cinnamon pastries, right enough – you'll enjoy 'em good!”

Celly turned to the same page in her book, and blinked a few times – the picture was nice, and looked very tasty, but it was a little hard to focus on the words.

“What you got to do is to take some cinnamon and sugar, and mix them together,” Applejack went on, demonstrating with a bowl. “Around and around, mixing in the cinnamon and the sugar… isn't that right, sugar? Mixing in sweetness by going around and around… then adding in the apples, mixing them around and around in the sugar too… don't that sound so tasty?”

“It does sound tasty, yeah...” Lulu said, copying Applejack's movements. Around and around…

“Then you take the pastry, and you fold the apples into them,” Applejack explained. “Trapping all that sweetness in, so when it goes in the oven it'll melt a little and turn into lovely apple filling...”

Celly yawned, feeling more than a bit dizzy.

“And they're done!” Applejack said suddenly, taking the tray out of the oven.

Celly blinked.

Had they really been in here that long?

That question was washed away by the sweet taste of the first pastry, and it didn't really come back.

“Alright, now get to your stations. You can't stuff yourselves all day. At least not until you've made them yourselves.” Applejack teased. Lulu and Celly stepped out of their chairs, each one reluctant to leave behind the sweets and taking a few with them.

They waddled over to their cooking stations, opening their books to the appropriate page. Celly started by imitating what Applejack had done by mixing together the cinnamon and sugar. While doing so she was looking through the rest of the recipe, which was now telling her how to mix together the yeast to make the dough.

Dough?

Celly paused. She didn't remember seeing Applejack making dough for these pastries, she thought that was already done for them. She dug around in the cupboard, looking for the yeast.

Meanwhile Lulu was already attempting to prove her dough. She was kneading and squishing it about. She poured the cinnamon and sugar into the mix, and watched as everything swirled together. She giggled a little as she enjoyed the plush doughy texture in her hooves. It squished and smushed around, and she could feel like she could just flop down into a bit mass of warm puffy dough.

Celly switched on her oven, starting to heat it up and swishing her padded rump in front of it to keep her padding toasty.

The cooking process passed in a kind of slightly dizzy blur. The bits which each student alicorn found boring passed quickly, almost without their needing to pay attention, but the bits which sounded nice or tasty or pleasant stretched out for Celly to wiggle and fluff her rump or mix dough or for Lulu to swirl her ingredients and fold her dough together.

“That's right,” Applejack said, crinkling a little herself. “You just get you into a rhythm, right enough, and the cooking goes right by… just let it take over, no need t' think...”

“Mmhmm...” Celly agreed absently, nodding as she baked and baking as she nodded, and time seemed to swim by as ingredients became dough became pastry.

“Yep,” Applejack went on. “The oven's makin' the room so warm, so easy to get drowsy… warm an' all… like a lovely summer day...”

Lulu pulled the tray out of the oven, tasting one of the apple treats and gasping at how hot and tasty it was, and sat back with a flumph on her padded rump.

“But you gotta test out the drink, too,” Applejack reminded them. “What kind of drink would go best with apple pastries like this?”

“Well, uh...” Celly began. “I guess… hot chocolate? Or spicy apple mead?”

Applejack snickered poking Celly and making her rock back on her rump a little. “Cider, silly! Everypony loves apple cider, after all.” Applejack produced two bottles of cider, handing one to each of the princesses. Celly popped the bottle into her mouth, letting out a sigh as she began to drink the cider down. She leaned backwards, the cider warming her up just as much as the oven warmed her rear. The bottle seemed to hold much more cider than Lulu expected, but that thought was quickly washed away with another drink. She rocked back and forth, leaning further and further back with every drink. Applejack waddled over to her, leaning down to see some dough that had splotched onto her padding. She gave it a poke, smirking a bit.

“Oh dear, Lulu, I think your dough's still a bit under done! They'll need to be put back in the oven!” She bounced her rump into Lulu, knocking her into the oven. Lulu squeaked as she was enveloped in warmth. She let out a sigh, finding it only pleasantly warm.

She closed her eyes, wiggling her rump as her padding began to slowly rise...

Celly was still gobbling up apple treats and drinking cider, patting her gut as it slowly filled with sweets. Her belly stretched outwards, sloshing as it grew bigger and bigger.

Cozy warmth and happy eating both filled the next several minutes, or hours… neither Celly nor Lulu could have told any-pony how long their class with Applejack went on for.

The plushily plump earth pony happily told them about how good it felt to eat food you'd prepared for yourself, and how much easier it was to relax with your hunger sated on a warm summer day, and how good the sun was, and how much better days were than nights… it all faded into a warm, cozy blur and drifted past…

“...and you'll find your lunchboxes full of extra treats from class,” Applejack said, her words drifting out of what seemed like nowhere. “So you'd better get goin' to your next lesson, or y'all are gonna be late!”

“Late?” Celly replied, blinking. “I… r-right, yeah!”

She glanced over at Lulu, whose padding was still puffed up from her time being cozily warmed in the oven. “But… wait, shouldn't there be lunch at some point?”

“After all those pastries you still want lunch?” Lulu giggled.

“I – well, um…” Celly blushed. “Never mind...”

“That's right,” Applejack agreed. “Y'all next lesson is Fluttershy's class about animals. Don't forget, the sun's better!”

“The sun's better,” they both mumbled, eyes blurred for a moment as the odd greeting sounded just right to repeat.

The two waddled off to their next class, no longer needing to check their schedule or the map of the school to find where they were going. Instead they just wandered through the halls, ever turn seeming to bring them to the right place, even if they weren't entirely sure where they were meant to be going.

They soon came to a classroom with several large tanks set up within it. Most were filled with small critters, one had a snake coiling around a stick, another with a rabbit munching on some carrots, but a couple were filled with water, fish swimming around within, shrimp cleaning the tank walls, and a few octopuses hiding among the rocks.

Lulu stared up at a bird on a swing which cocked its head to stare right back down at her. “Hello! You're just in time for class!” A quiet voice could be heard from the front of the room. A yellow pegasus was standing by a desk, although she didn't seem to command quite as much attention as the others had. She gave a slightly nervous smile as she trotted up to Lulu. “I see you like Cerulean here. Do you know what kind of bird he is?” She asked.

Lulu looked back up, scratching her head as she tried to think of the name. It seemed like it should be obvious... it was a bird... and blue... but…

“I… I'm not sure,” she admitted, blushing a little.

“That's all right,” the pegasus told her, blinking her cool, slitted blue-green eyes. “If it helps, I'm fluttery, and a bit shy, so I'm Fluttershy. And he's blue, and a bird, so...”

“...oh!” Lulu realized. “A bird-blue!”

“That's close enough,” Fluttershy told her. “A bluebird, but you were very close. And, as a reward, you get this!”

She passed Lulu a piece of bluish cloth, the colour of the late afternoon sky, and Lulu examined it. It looked sort of like a wing, but very plushy and thick.

“I… well, thank you?” she said. “What is it?”

“It's your reward for answering a bluebird question,” Fluttershy told her. “You put it on your wing.”

As Lulu began to do so, still a little confused but unwilling to question it, Fluttershy turned to Celly. “And what about this one?”

Celly examined the tank Fluttershy had indicated, and brightened. “Oh! I do know that, that's a lobster.”

“You're right, but that's not the question,” Fluttershy said. “If that's alright, I mean?”

“Of course,” Celly assured her. “You… are the teacher?”

“I don't want to be a bother,” Fluttershy said quietly. “But… well… I wanted to ask if you knew what was different about the claws a lobster has.”

“What's different about them...” Celly repeated, and looked at the lobster in the tank. She crouched close, her butt wiggling in the air as she tried to get a good look, then realized. “Oh! They have two different claws, they don't have the same one twice!”

“That's exactly right,” Fluttershy praised her. “So you get a lobster claw for your leg.”

She passed Celly the plushy costume piece, and returned her attention to Lulu.

“How about him?” Fluttershy asked Lulu, pointing to the noodly fuzzball beside the rabbit. Lulu pondered the peculiar animal in front of her.

“I think it's a ferret.” Lulu said, watching as it spun around in place excitedly.

“Very good!” Fluttershy praised Lulu, giving her a push paw to slip over one of her legs, which she promptly did. “Can you tell me where they like to live? For extra credit, that is. I, um, don't mean you won't get your normal credit...”

Lulu watched as the critter slipped into a small tube, poking its head out to look back at her.

“Uh, the woods? Where they can play in logs and stuff?” Lulu asked. Fluttershy smiled warmly, patting Lulu's flanks. With a puff, her padding fwoomped up slightly, swallowing up the base of the sleeve of Lulu's ferret stocking.

Celly was playfully waving a hoof around in the snake terrarium, the small animal's tongue flicking out occasionally to lick her. She giggled, watching as it slithered up around her hoof.

“Oh, careful, Celly!” Fluttershy said, hurrying over. “A cottonmouth snake's awfully dangerous! Don't you know that? Oh, well, I guess you wouldn't, that's the whole point of the class...” Fluttershy let out a nervous giggle.

“What's so dangerous about them?” Celly asked.

“Well, if they bite you, you'll feel all numb and cottony, and you'll turn big and plushie too!”

“Oh!” Celly said. “So… I should be careful?”

“That's right!” Fluttershy agreed. “You should watch out, because if you make a mistake and startle it...”

Celly gasped slightly.

“Oh, dear...” Fluttershy simpered – rolling her eyes, though neither Celly nor Lulu noticed. “You've been bitten! Now you're going to get all big and plushie, oh dear...”

“It doesn't feel all that bad,” Celly said, examining her leg as the snake slithered back down it. “Well, I guess it does feel kind of numb?”

“That's because of the bite,” Fluttershy explained. “Um… you're going to just feel all numb, but you'll start to swell up… oh no, there it goes...”

Celly began to get larger and plusher, the lobster-arm she'd already earned growing with her, and her diaper seemed to flow outwards – covering her in plushy material at speed, leaving her looking snug and warm and huggable.

“I, um...” she protested. “This is… uhh...”

As she tried to put together the words for what was happening, Lulu was making friends with a raccoon – answering Fluttershy's question about how raccoons had good manners, and earning a nice plushy pair of raccoon paws for her forelegs. Then she noticed what was happening with her sister, and blushed. “Celly! What happened?”

“W-well, I… think we should still do the lesson,” Fluttershy told them both. “Perhaps Celly would like to do a question about a bird? I've got a nice bat called Shade, but that seems more like one for Lulu...”

Celly flopped onto her thicker rump, a cloud of foal powder puffing into the air as she did. “I guess I can talk about some... birbs...” Celly shook her head, the plush fuzzy feeling spreading over it as she became a little dizzy. Fluttershy smiled, drawing the thickening filly's attention to a different cage where a brightly colored bird bobbed up and down, peering down at them. It puffed out its chest, flashing its wings and tail at Celly.

“Can you tell me what this bird is?” Fluttershy asked as the bird continued its fancy display.

“Oh, I know this! It's a bird of paradise!” Celly said, eagerly getting back to her hooves. Despite her bloated form, she attempted to replicate the bird's movements. She giggled, shaking her butt around just like the bird did, puffing her chest out and bouncing in place.

Fluttershy giggled, handing over a bright tail to slip over Celly's so that she could better frame her bottom for the bird.

As Celly continued her mating display, Lulu bounced over, polishing an apple she'd swiped off of Fluttershy's desk with her raccoon paw. “Who's Shade?”

“Oh, he's Shade!” Fluttershy said. “He's a vampire bat! Oh, wait, I was supposed to let you guess... oh well, you know what vampires do, right?”

Lulu looked up to see the bat hanging from the top of a cage, flashing fangs at her.

“Well, they… I think they suck something?” Lulu asked.

“That's right, they suck things,” Fluttershy agreed. “And it's good you have that apple with you, that'll be a great help!”

“It will?” Lulu blinked. “Oh! So they suck fruit, I see!”

“No, um… n-not exactly,” Fluttershy corrected. “Um… if you want to see, then Shade can demonstrate...”

She opened the cage door, holding out her soft-looking forehoof, and Shade came fluttering down to rest on it. He showed off his fangs, and Fluttershy petted him gently on the top of the head.

“Who's a cute little chiropteran?” she asked. “That's right, it's you!”

Shade preened, then took off and nommed on Lulu's ear.

“Ah!” Lulu said, surprised, and nearly dropped the apple. “Hey, what was that for?”

“Well, it's what they do,” Fluttershy explained, as Celly continued to shake her butt in the background with the colourful feathers waving back and forth. “They drain fruit from ponies, and then the ponies drain fruit from fruit.”

Lulu blinked, wobbling to the side a little, then bit into the apple and sucked all the succulent juice out of it.

“There you go, see?” Fluttershy giggled, giving her a plushy bat-wing to go with her bluebird-wing. “Isn't nature wonderful?”

Lulu couldn't help but agree, seeing nothing wrong with such a silly intermediate step as her cheeks filled with apple juice. She gulped it down, humming happily.

With both ponies distracted, it wasn't hard for Fluttershy to continue rattling off questions for the two. Celly correctly identified a hare (though that was certainly one of the easier questions), while Lulu knew about the intricate relationships between manticores and dragons, and earned herself a large claw as well. Celly was sent running around the room in panic when Lulu slipped a millipede down her padding, only for Celly to retaliate by spraying Lulu's rump with a squid's ink.

Soon the ponies were an amalgamation of animals to put Discord to shame, Fluttershy praising them with every new animal part they earned. “I think you've truly gained a new appreciation for animals!”

Once they were fully re-dressed, Fluttershy gave them both a hug and sent them on their way to their fashion lessons – but not before telling them both to love the night, which made both Celly and Lulu smile at the very kind greeting.

“I learned a lot!” Lulu announced, as they waddled through the corridors of the school and she flapped her mismatched pair of suit-wings. “There's so much about animals that's fascinating, isn't there?”

“You're right, Lulu,” Celly agreed, her tail bouncing a little as she walked. “But, hmm… I wonder who's going to give the fashion lesson?”

“It's going to be Rarity, isn't it?” Lulu said. “We've seen her already, she got our uniforms sorted out… though I suppose we're not really wearing them very visibly now. I hope she won't be upset.”

“I'm sure she won't mind,” Celly decided. “Though I wonder what the lesson's going to be about… and where the lesson is, actually...”

She frowned, losing focus a bit, then turned the corner. Left, right, and she was standing in front of the door to the room.

“Oh!” Lulu said, impressed. “Good work, Celly!”

She pushed the door open.

“Ah, good afternoon, darlings!” Rarity said, adjusting a pair of novelty glasses balanced in front of her slit orange eyes. “I'm glad you're on time to your fashion lesson!”

Celly and Lulu stepped into the classroom, looking at the bundles of fabric on display in one corner, while several dresses hung in another. As they entered however, Rarity's look of excitement turned to one of modest disgust. “Ah, and it's a good thing you've arrived too. We'll have to get you out of those ghastly night attire and into something more fitting for the day.

Lulu looked down at her suit, tugging on one of the legs a little. “What's wrong with them? They're warm and comfy, aren't they?” She said.

Rarity nodded, floating a measuring tape over as her horn glowed, “Well, yes, comfortable is always a good quality to have, but you want to be in something that properly shows off your padding too, don't you?”

Celly nodded, supposing that made sense. There was the sound of the suits unzipping, and Celly and Lulu found them slipping easily off of the other before being stuffed into respective cubby holes as Rarity walked around them. “And you don't even have your old uniforms on under them? Goodness, it's a very good thing you've got fashion lessons! Don't you worry, you'll be making some lovely outfits for yourselves soon enough!”

Rarity handed them each a roll of tape before trotting back to the front of the room. “First things first, you'll have to take your measurements to make sure your dresses will fit! You don't have to be perfect, if something is just a bit too small we can always add some puff to get it to the right size, and if it's too big, that will work just as well too! Puffiness does tend to solve a lot of problems like that.”

“Are you sure we'll have enough time in the lesson to do that?” Lulu asked, a bit uncertainly. “That sounds like quite a lot to do in one lesson...”

“Of course you will!” Rarity replied firmly. “Who's the teacher here?”

“Y-you, Miss Rarity,” Lulu said, abashed. “Sorry...”

“Well, it's not a big problem,” Rarity told her, relenting a little. “Now, since it's harder to take your own measurements, you'll be measuring one another.”

“Okay, um...” Celly began, using her horn to hold out the tape. “So… what bits do we measure?”

“Anything you think seems important,” Rarity waved her hoof airily. “Just go ahead and do it, see how it works out!”

Thus advised, Celly began by measuring the length of Lulu's horn. Then she measured how long each of Lulu's legs were, one at a time, and Lulu started trying to help by measuring the same places on Celly at the same time.

Things quickly got confusing, especially when Rarity pointed out that they'd need to model diapers of the right thickness and both sisters understood that to mean much thicker than the ones they were wearing right now, and after about ten minutes Celly was hopelessly tangled up in measuring tape and her only solace was that Lulu was also tangled up in measuring tape underneath her.

“This has not worked,” Lulu mumbled.

“But it seems as though you have quite enough measurements!” Rarity said brightly.

Rarity's horn glowed and encompassed both fillies before suddenly yanking the measure tape out. The two spun around and around as the tape untangled itself, Celly rolling off of Lulu before the two were left wobbling in place as Rarity rolled up the tapes neatly and placed them back into her desk drawer. “Now that you've got your measurements, the next step is picking out the fabric you want. There's lots of choices, each with lovely little perks. There's smooth, flowing silk, soft, cushy cotton, or if you're feeling brave, squeaky vinyl gives a marvelous shine to anything that it lines.”

Spools upon spools of fabric floated and unraveled themselves in front of Celly and Lulu, each one having difficulty deciding. “And that's just one fabric! The best kind of clothes mix and match a couple for a multitude of wonderful comfortable styles! And we haven't even gotten to patterns yet either! Stripes, polka dots, plaid, checkerboard, stars, diamonds, anything you could possibly wish for!”

Celly's eyes spun as she tried to keep track of all the fabrics, Lulu not faring much better as she raised a hoof to point something out in the swirl of color in front of her, only for it to be lost in the blur.

Eventually Lulu gave up trying to make sense of it, hoping that whatever she chose would be good to work with. Two spools landed on her desk, one a dark blue and black checkerboard vinyl, another smooth and silky gold.

Celly was gifted with pink cotton, not unlike that of a plush toy, and something red and white striped which crinkled as she poked at it, looking a little like her own diaper.

“Excellent!” Rarity said with a broad ~~fanged~~ smile. “Now you've got the fabric, which is the second step! You need to use these scissors, these needles, this thread-” her horn glowed as she levitated over one piece of equipment after another to each of the duo, and the list of tools sort of blended together into a drone which neither Celly nor Lulu actually remembered all of.

She kept talking, explaining how to cut fabric and pleat it, how to sew and stitch and crimp and darn, and Celly worked away on the pink cotton to make big ruffled shoulders… a section for her body barrel… four trouser legs… the big overhang for her diaper, and the bit which went up her front and her neck as well. As she did, Lulu was putting together something similar using the blue-and-black checker pattern – something making her want to put it together in ways which confused the eye, switching the checker back and forth every few rows so a pony's eye would get mixed up as they looked at it.

Lulu went on to add the ruffles, using the silky gold, and then the petticoats as well – four layers of them, which lifted up the back of the ball-gown she was making to frame her diaper in gold without actually concealing it.

“Excellent!” Rarity repeated. “You should always draw attention to your best asset, girls, and that is definitely your best asset!”

Celly and Lulu added their finishing touches, Celly tugging tightly on the thread to stitch together the red and white striped diaper cover where her diaper would be under the skirt, while Lulu was finishing sewing together matching stockings for her dress. “Marvelous work darlings! Now go try them on so we can see how you look in your new outfits.” Rarity urged, pulling curtains over to give them a bit of privacy.

The pair excitedly pulled on the dresses, Lulu's dress squeaking with every tug and movement. She wiggled her hips as her diaper slipped into place, presented proudly under her creaky skirt. Celly admired herself in the mirror, the ruffles of her shoulder pressing into her softly. As the two looked over their dresses, however, they felt just a little embarrassed. Despite how much fun they had making them, they hadn't given much thought to what exactly they would look like once they were on, and now that they were, they were even more silly and frilly appearing than they could have imagined.

It didn't help when their curtains suddenly disappeared, revealing the princesses to Rarity. She gasped, squealing ever so slightly as she looked them over. “Darlings, you're absolutely adorable! Why I don't know if I could do better myself!”

Celly blushed, though her embarrassment was offset a little as she giggled a little at Lulu's own appearance. “Hehe, are you sure you couldn't do better?” She asked.

“Well, since you ask...”

Rarity's magic picked up in a swirl of needle and thread, and several more strips of fabric came rising up out of the collection to the side. Celly saw red, yellow, blue, violet, orange, green, indigo, and then they all sort of merged together into a swirl as the white unicorn ~~with little bulges where wings would be~~ worked her art.

It was hard to focus on what was going on, especially as the wind picked up and lifted up the hems of their already-revealing ball gowns, and Lulu flushed brightly – then blinked a few times, losing focus as the swirl of fabric and gems cascaded around her.

When the spiralling material faded some time later, both ponies blinked – then did a double-take at the mirror.

Any hint of subtly hiding their diapers or their infantile dress was definitely gone, replaced by little touches and not-so-little ones which made the situation incredibly obvious. Celly's diaper had grown to at least half again the size, bulging up the whole gown, and she was wearing big Sun-patterned booties around her hooves which made it difficult to even stand upright consistently; Lulu's had a moon-pattern, but were otherwise the same, and she also noticed that she had a pretty little cover on top of her horn with a moon motif – matching Celly's sun-motif horn cover.

Lulu tried to use her magic, but the cover glowed, and her eyes went a little vague.

“Now, now, proper ponies don't disagree with the sartorial decisions of their dressmaker~!” Rarity said, as Lulu fell backwards onto her diaper with a loud crinkle.

“But these make us look really foalish,” Celly complained.

“Of course,” Rarity agreed matter-of-factly. “That's the in look this season!”

“Oh, I suppose that makes sense,” Celly said. Royals always wanted to retain their youth, after all, and what was more youthful than a foal? She didn't give it much thought beyond that, trying to waddle back to her seat, though the added bulk in her padding made that even more challenging. Not to mention her hooves slipping on the polished floor, forcing her into an awkward waddle and crawl to maintain her hoofing.

“And for the last part, the photoshoot! That way you can see how far you've come from just your first lesson!” Rarity said, producing a camera. She started to snap several photos, Lulu and Celly blinded by the flashes. They shook their heads, and when their vision returned, they were greeted by several snapshots of them flaunting their rumps and dresses, which Rarity was pinning to a cork board, and which only covered a worryingly small corner of the display.

“Now hurry off, the day's almost over. And you'll want to get as much sun in your life as you can!” Rarity smirked, hurrying the two out the door.

Lulu looked up to Celly, still a little discombobulated from the camera flashes. “Oh, uh... where are we now? Was that all the classes for the day?”

“I… think maybe?” Celly replied, trying to remember the timetable. It was always confusing for her to try and think about it, like it wavered in and out of focus, then she gasped. “Ah! I remember now, there was something else!”

“Oh, okay,” Lulu said. “So… what is it?”

“It's something that confused me,” Celly said. “Something about, um… oh, that's right, it confused me because I wasn't sure if it was a lesson or not. It's with Twilight, so it could be a closing speech or it could be a lesson.”

That made sense, and Celly nodded to herself in satisfaction – glad she'd worked out what it was. Then she began waddling along, Lulu hurrying behind her, through the school corridors.

After so many lessons, a lot of things which they might have noticed before didn't show up on their radar at all. The complete and total lack of any other students didn't seem suspicious, the large number of rooms for a school with so few students wasn't worth thinking about, and the way that they didn't actually follow a path through the school – just had a long perception of walking, before ending up at the lecture theatre for Twilight's timetabled slot – was perfectly natural.

“Ah, good evening,” Twilight smiled. “Isn't evening good?”

“I… yeah, I guess evening is good,” Celly said, taking her seat.

“That's right, that's very good of you to notice,” Twilight told her. “Now, your final lesson today is going to be on your test, so you'd better pay a lot of attention.”

Behind her, the chalk levitated up to draw on the board. “The lesson is all about different types of hypnosis.”

“Now, the most well known type of hypnosis involves somepony watching something, usually a small, shiny object, move in some sort of pattern.” Twilight pulled out a pocket watch, pretending to search the empty audience before focusing on Celly. “Would you mind coming up? I could use a volunteer to better explain this.”

Celly nodded, walking around to the steps at the end of the stage to hurry up to where Twilight was standing.

“If you'll just focus on this, you'll see what I mean. How the metal shines and sparkles, drawing your attention and blocking out anything else that might be going on.” Twilight began to swing the watch back and forth in her magic, Celly's nodding slowly as she focused in on it, completely unaware of the fact it would be hard for her to learn this hypnosis if she was supposed to be the target.

“Now, this hypnosis technique does have its drawbacks. It's fairly obvious and cliché, so anypony who knows about hypnosis will probably be unaffected, but this can easily be circumvented by attempting to hypnotize somepony when they're tired or focused on something else.”

By this time Celly was wobbling on her hooves a little, swaying back and forth along with the watch.

“Once the pony has been properly hypnotized, then you can start giving them suggestions, or implanting triggers. Do you know what those are, Lulu?”

“Oh, uh...” Lulu began, shifting a bit in her chair – her crinkly diapers rustling. “Suggestions sounds like they're saying things the hypnotized pony could do? Or will do?”

“That's very good,” Twilight agreed. “And triggers?”

“I… no, sorry,” Lulu admitted.

“Triggers are things where you give the pony an instruction, but it doesn't happen right away,” Twilight explained. “It happens later, or it stays in place. What do you think would be something that would be a good trigger or suggestion for Celly to have?”

Lulu frowned, trying to think of something which would be a good demonstration of hypnosis.

Naturally, something that was a good demonstration of hypnosis had to be something which would show that Celly really was hypnotized, rather than faking it… that seemed to make sense. Then Lulu giggled, as she realized there was a chance here to have Celly do something silly.

“Oh, I know!” she said. “What about a trigger so Celly thinks the right name for diapers is rustle-pamps?”

“That's a bit like a mixture of a trigger and a suggestion,” Twilight corrected. “But what would make it a trigger is if it was more like this.”

She continued swinging the watch. “Celly, if somepony asks about what you're wearing, you will tell them that you're wearing rustle-pamps. You won't think of them as diapers, you'll think of them as rustle-pamps, and you'll proudly explain why you're wearing them if anypony asks.”

Lulu watched as Celly nodded a little hazily, and could barely contain her giggles.

Twilight stopped swinging her watch back and forth, though Celly continued to sway a little bit on her hooves. “Now, once you end the hypnosis, they won't remember receiving their triggers, but they will remember them.” She turned back to Celly. “Now when I stomp my hooves, you'll head back to your seat and we'll continue with our lesson.” Twilight lightly stomped on the stage, Celly blinking and shaking her head.

“Oh... I hope the demonstration went well.” Celly said, her senses slowly coming back to her. As she turned to trot back to her seat, Twilight spoke up.

“It went very well. You did a good job showing off your... what do you call those again?” She asked, pointing to Celly's diaper.

Celly looked over her shoulder at her padding before grinning widely. “They're my rustle-pamps silly! Thick, crinkly rustle-pamps! They're the best things for keeping your butt comfy no matter where you sit!” She said excitedly, shaking her butt left and right.

Luna fell into a fit of laughter, trying not to fall out of her seat at Celly as she waddled back to her seat. Celly stuck out her tongue at Lulu as she sat next to her, her padding crinkling loudly as she flopped down.

“Very good, Celly, now you can see some more hypnosis. For example, you can implant triggers without the pony even noticing they were hypnotized, isn't that right, Lulu?”

Lulu's laughter died down as she tried to pay attention to Twilight's lecturing again. “...huh?”

“I hope you're paying attention, Lulu,” Twilight chided gently. “Now, as I was saying, you can give a pony a trigger without them even noticing they were hypnotized. It might be that they think the hypnosis session was a simple conversation, or a lesson, or they might not remember it at all.”

“Oh, I… I didn't know that,” Lulu said, blinking. “That's… huh.”

Celly giggled.

“What is it?” Lulu asked, looking over at her. “Is something wrong?”

“Oh, nothing~” Celly replied, still giggling. “It's just kind of funny that you didn't know that, that's all...”

“Why is it funny?” Lulu asked. “I don't get it, did I miss something? I thought we'd only just started the lesson…”

Celly giggled again.

“I'm surprised you're having so much trouble concentrating,” Twilight said. “Maybe it's because of the sound of the rain?”

Lulu blinked. “I… can't hear any rain,” she said.

“Can't you?” Twilight replied. “But there were definitely rainclouds outside.”

“I, um...” Lulu began to protest, but only a moment into talking she flushed suddenly – feeling a sudden urgent need, before sighing and relaxing. “Rain clouds mean things get wet...”

“That's right,” Twilight said, nodding – her eyes flashing a little. “So, you can see how a pony can have a trigger put in without their being able to remember it.”

Lulu frowned, not sure how what had just happened was relative to the lesson, then blushed suddenly as she realized how wet her padding was. She poked her diaper, ears going flat at the squishy noise.

“Um… sorry, Miss,” she said.

“That's all right, Lulu,” Twilight said. “It's what they're for.”

“It's what they're for,” Celly and Lulu repeated automatically.

“Now, let's talk about mantras,” Twilight added. “A mantra is something which a pony is given to repeat, sometimes as a hypnotic trigger, which makes it so they believe that thing more strongly. It's a good way to reinforce a hypnotic suggestion. Let's try something about how lovely the night is as an example.”

“The night is lovely.” Twilight said.

“The night is lovely.” Celly and Lulu repeated.

“The night means cozy diapers, and warm blankets.”

Celly and Lulu dutifully repeated this, finding everything Twilight was saying to be true.

“The more you repeat something, the more it sticks in your mind, making it easier and easier to simply find what you're repeating to be right. The night is lovely.”

“The night is lovely.” They repeated.

“And, something which ties in well to mantras is subliminal messaging. Not only are you repeating your thoughts, you don't even have to think about it! This is best done with quick flashes of messages, either audio or visual.”

As Twilight talked, Lulu and Celly thought they heard something about swelling padding and thick diapers, but they really couldn't be sure. They just kept thinking about how the night was good and lovely.

“Bah, but the better mantra, the better the hypnosis!” Another voice could be heard. A second Twilight was trotting up onto stage, looking equally as puffy as the first, though she was levitating her chalk in a soft orange glow.

“And everypony knows that the day is truly best! It means more light to show off your rustle-pamps!”

The two fillies nodded, Celly slightly more so than Lulu.

“And don't forget the classic spirals for hypnosis. The way they make you feel like you're slipping deeper and deeper into the suggestions!”

“Of course, any kind of conditioning can work,” the first Twilight said, sounding slightly miffed. “But everypony knows that the best kind of conditioning is the kind which mixes in triggers, so good little fillies can learn just how wonderful the night is.”

The sisters went all fuzzy when the first Twilight called them good little fillies, any lingering confusion about why there were two Twilights going away in a flash of swirly feelings and vague thoughts.

“But triggers can sometimes be used by a different pony to the hypnotist who first put them in,” the orange-magic Twilight countered. “So good little fillies would be able to learn how amazing daytime is as well.”

The blue-magic Twilight drew a series of spirals on the board. “Though it's night-time which is good for sleep-learning, subliminal learning which happens while the subject is a good sleepy filly and can't possibly resist anything which their hypnotist tells them.”

Lulu yawned at the words, imagining being all snuggled up while a nice voice whispered in her ears about how she was a good sleepy filly who loved the night.

“But there are other kinds of hypnosis which work best in the day,” the second Twilight said, drawing her own spirals with a different colour chalk. “A pony who's asleep can't watch a hypnotic film, or read a hypnotic script about how the day is the best.”

Celly giggled, following the chalk around and around in circles with her eyes and feeling fuzzier and blanker with every revolution.

The two Twilights continued to glare in each other's direction, each of the fillies watching fixated on a singular color of spirals. “But at night time one can dream, and dreams can be filled with whatever the hypnotizer wishes the fillies to see! Ah, not that you need to worry about dreaming, of course.” The blue eyed Twilight chuckled a little to herself as she addressed her audience. Neither Celly nor Lulu seemed to have picked up on what she had meant by that, instead thinking about dreams filled with fluff and puffiness.

“Bah, and surely you've heard of daydreaming too! When you're no longer paying attention to what you're being taught, so they can slip in whatever they wish. Then they get to decide where you take your adventures so that they remain just as fuzzy as blank as the dreamer is too...”

Eventually both ponies had filled their respective sides of the board with their spirals, now attempting to cover up the other's side.

Eventually the golden Twilight straightened up, smoothing her puffy chest out a bit. “Perhaps now would be a good time for a pop quiz. To help the fillies show that they've learned the day is the better time.”

The other smirked, pulling over some papers. “If you insist, but I do believe you'll find they know the night is the best.” The two began to scribble down questions, with Celly and Lulu's trance finally broken as their vision was filled with a questionnaire rather than the spirals of the chalkboard.

“Oh, um… I didn't study for this,” Celly protested.

“That's the best kind of test, of course,” the golden-magic Twilight said, her eyes flashing. “That kind of test tells you what you really know, not just what you read five minutes ago and forget five minutes later.”

She chuckled. “Not that remembering things should be something you should concern yourself with. Just answer the questions with what makes sense, and you'll be fine...”

“R-right,” Celly said, and looked down at the paper.

It seemed to swim a little in front of her as she blinked, trying to focus on the words.

There was a question about whether repetition helped hypnosis, and Celly thought about it before nodding – writing a 'yes' in the answer box.

Then there was the same question again, and Celly raised her hoof.

“Yes?” the turquoise Twilight asked.

“Oh, well… are all these questions right?”

“All the questions are right,” the golden Twilight told her. “Just answer them all.”

“Okay...” Celly said, and returned her focus to the questions.

As she did, Lulu turned over to the second page of her paper.

There seemed to be an awful lot of it, like one about which swirl was better, and she thought about them as she wondered how to answer – imagining both spirals at once, one red-and-gold and the other blue-and-green.

After several long seconds staring into space, she wrote down her answer and kept going.

Lulu looked to the next question, only for her eyes to glaze across it and not even realize where the answer was supposed to be put, let alone what the question was asking. She read the question, then read it again, then looked back over it once more to be absolutely sure she understood what it wanted. She finally came to some sort of conclusion, and wrote down 'gold' before moving on to the next question.

Celly was on the essay section of the quiz, though rather than writing anything down she blinked and found she had been half dozing off and doodling in the space provided. A series of spirals, stripes, criss-crossing and hatchwork to form a magic-eye picture was staring back up at her from the paper.

She glanced back to the question, then shrugged and moved on, finding that her doodle seemed to provide all the relevant information and anything she wrote down wouldn't do her answer justice.

She chewed on her pencil as she flipped through the packet, continuing her slow work. A lot of the questions seemed more like opinions than actually facts. But perhaps the questions were just the kind where one answer was 'more' right than the other. One Twilight flipped over an hourglass, announcing to the two fillies that they only had 5 more minutes before they would turn in their papers about how good the night was, only for the other to interject they were writing day essays. Neither filly paid much attention to their squabbling, as they were sure in their answers on which one was truly superior.

“And time's up!” one Twilight announced. “Were you good fillies?”

“I was!” Celly called, waving her hoof in the air, and Lulu nodded as well – proud to be a good filly like her sister.

The other Twilight collected the papers with magic, and they began looking through them – bickering back and forth about the interpretations of the marks, contesting whether an answer was a day-answer or a night-answer.

Lulu fidgeted a little as she waited to hear how it had gone, bouncing in her seat with a crinkle-squish sound. She could hear the two purple alicorns arguing over marks, but she wasn't even able to recognize which of the answers they were quoting to one another was from her paper – the whole thing was all fuzzy and kind of blank, and she wasn't really sure how she'd done or what it would mean.

Eventually, however, the flame-eyed Twilight and the cool-eyed Twilight seemed to reach a conclusion, though not without some grumbling.

“All right,” one said, taking a paper. “This one's mine, because she showed how much she agreed the night is the best!”

“Well, this one's for me, because she wanted the day,” the other one countered. “So there.”

Almost in unison, both Twilights flipped back to the front page of the paper, and paused.

“Huh,” one said, eventually, a smirk spreading across her face as she held the paper in her orange magic. “Who knew. Okay, Lulu, it's time for extra credit...”

Lulu jumped out of her chair, radiating excitement as she hurried after the orange magic Twilight. Celly instead followed the other Twilight, who was looking equally pleased with the results of her test. “I'm rather surprised, Celly, I didn't know you enjoyed the night so much,” she said.

“But it's so wonderful! The beauty of the stars, and especially the moon! Being wrapped up in covers and pillows and lots of fluff!”

Twilight laughed. “Oh, don't you worry, we'll get you plenty of fluff to wrap yourself in. And a very pretty moon to match it.”They soon stepped into a small private room not unlike the changing rooms where they received their uniforms at the start of the day.

“First we'll get your your new padding.” Twilight said, her horn aglow as she pulled open a drawer. Several thick diapers puffed out of it, each stuffed snugly into place. She slipped out one of the midnight blue diapers, a splotch of black on the rump with a bright crescent moon in the center.

Celly eagerly took the padding, sitting down atop it and wrapping it around her school padding before securing it to her waist. She rocked back and forth, her hind legs spread wide by the crinkly puff.

Lulu was admiring her new crimson sun emblazoned diaper as she waddled about, Twilight giving her a few comforting pats. “Now for the next bit, your new suit.” She pulled out a thick plush suit, one which looked an awful lot like her sister, but taller, more aggressive, and far, far puffier. These details only made Lulu giggle as she took the suit in her hooves, however, quickly unzipping the back to climb in.

It felt all snug and warm and plushy as she squeezed in – warm especially, as each hoof slid into the end of the matching leg of the suit and touched the area around the costume-plush shoe on the outside. Lulu felt a kind of hug, and a tingle spread up through the plushy costume, and she couldn't stop focusing just how bright and warm it all felt!

She giggled as Twilight helped her fit herself into the muzzle of the suit, then threaded her wings into the suit-wings, and as a faint crinkle-whisper filled her ears.

“There we go!” Twilight said. “You look much better now! You look like a true day-lover who knows that diapers by day are the best!”

Lulu smiled happily as the suit was zipped up, and only barely noticed the lenses in front of her eyes – lenses that were red and orange and gold, and that swirled faintly in her vision.

“But you know what the right name is for an alicorn who loves the day and the sun...” Twilight added, slyly. “It's not Lulu at all, is it?”

She blinked, unsure what Twilight meant, then a new name came to her.

“Of course!” she realized. “I'm Daybreaker! Or Daydiaper – or both!”

“That's right,” Twilight agreed. “You love the day, and you're so confident about that that you want to make sure as many other ponies as possible love the day and wear diapers as they love it. It's the only thing that's important to you, especially because it lets you show up Nightwear Moon...”

“...and Nightwear Moon is by far the better of the sisters, as you know. Much more comfortably plump and plush than that flat Daydiaper!” Twilight continued as she trotted around Celly to admire her new look. “You'll show everypony that the night is the best, and that they'll all enjoy the thick pampers that come with sleeping soundly and snug to keep them warm throughout the night,” she continued. Nightwear stood proudly in front of Twilight, a look of smug confidence crossing her face as she gazed upon herself in the mirror. “There's nothing to worry about, Twilight. I'm sure I can show everypony how much grander the night is.”

“Then the last thing to do is for you to greet your incoming students!” Twilight said to Daydiaper, leading her back out of the hall. The two regal puffy sisters followed their respective Twilights back to the auditorium. Several ponies were now crowded into the seats, each one looking equally confused as to how they arrived in their location, and why there didn't seem to be anypony at this school. Daydiaper and Nightwear Moon stepped up to the podiums, each smirking and doing their best to look all the more impressive than their sister.

“Welcome, new students! This year is going to be quite a fun one!”