Fluttershy felt humiliated stepping through the automatic doors of the store.

Here she was, a full grown mare with a used diaper sagging between her flanks with tears in her eyes, suckling on a pacifier. What was she to feel but embarrassment. Out of fear, she instinctively grabbed Mommy's. . . er. . . Rarity's hoof. Of course, this didn't necessarily help her situation, but it made Fluttershy feel safe. She held her mommy's hoof as they walked through the store, trying to find the diapers.

This wasn't just your average convenient store where one would typically go to buy foal diapers. It was a specialty sex shop for adult foals like Fluttershy. Every shelf was lined top to bottom with colourful pacifiers, onesies, bottles, plushies, you name it! But Fluttershy didn't need any of it (as much as she wanted all of it). She needed diapers, and fast. The last thing she wanted was to have her diapers leak in public. Rarity had embarrassed her enough.

After wandering aimlessly, a young blue mare with a white mane stepped in front of them.

"Hi, I'm Silver Lining! Anything I can help you with, ladies?" Fluttershy immediately noticed she was wearing a diaper too, and it seemed to be really wet. Silver's such a naughty filly, isn't she? she thought.

Silver's muzzle scrunched up, clueing her in on exactly what the two were looking for. Fluttershy really did stink.

"Yes, we were looking for diapers, but they don't seem to be where I remember them being." Rarity said.

"Oh that. Yeah, we moved them farther from the entrance, to a more discreet place." Silver explained, "Some ponies are very shy about purchasing diapers. We like them to have privacy." Silver led the two mares to a set of shelves towards the back of the store. The shelves were comprised of everything a pony could ever want or need to get all padded up. From super thick diapers to scented powders to colourful diaper covers. Fluttershy eyed the shelves with hungry eyes. "You're foal seems to be a bit on the. . . er. . . stinky side, so how about these?" Silver asked holding up a package of "Silly Filly Soft Clouds."

"Are they any good?" Rarity asked, skeptical as to what she was being sold. Rarity never buys an accessory without first doing the proper research.

"Oh yeah, I'm wearing one right now!" Silver said a little too excitedly, turning her body to indicate the thick, wet padding between her legs. "I've been wearing this all day now, and I only just recently got this wet. I promise, it was a total accident. I was gonna change myself, honestly, but accidents happen." She was blushing, acting all embarrassed by her little "accident." "Trust me, these bad boys can hold alot without leaking. Seems to be something your foal could use, assuming how fast she probably goes through her diapers." Fluttershy blushed, being reminded of her soiled diaper, looking upon the thicker ones with hungry eyes.

"She's incontinent, I can't help it if she can't keep her diapees dry like a good girl!" Rarity teased, "I think those diapers would be perfect for my daw'ling Fluttershy! Can we change her here?"

"Sure, there are changing tables in the back." Silver informed her.

"Thanks, heres the money I owe." Rarity said as she held out a bag of 30 bits and took the package into the back. There were two doors that looked like restrooms, but as Rarity led Fluttershy through, there was only a changing table, powder, and wipes there. Rarity ripped open the new pack of diapers, then carefully removed the tapes of Fluttershy's thoroughly used one. She scrunched up her muzzle as she opened it up, releasing the putrid odor into the air.

"Ew. . . Mommy it stinky!" Fluttershy whined, taken aback by how much she'd actually gone.

"Yeah, you really had to go potty, didn't you?" Rarity teased, staring at her juicy, urine-drenched cunt with hungry eyes. She wanted to take her little girl right then, but had to hold herself back.

"Um. . . yeah. . ." Fluttershy admitted, guiltily. "I'sa naughty fiwy. . ."

"Mmm. . ." Rarity moaned, "Yes you are! You're my naughty, poopy-diaper baby!" Rarity threw the used diaper in the trash as she said this. She removed a single, lavender-scented wipe from the dispenser. She slowly lowered it on to Fluttershy's sensitive regions, making sure to be very gentle—

"Aaah!!!" Fluttershy gasped at the pleasuring sensation, "Oh wes, Mommy! I WUV YOU!!!" Fluttershy could never hold back her affection when Rarity cleaned up her accidents. She just loved being touched in that way. She continued to moan as Rarity move her hoof to her manure-covered hindquarters. Soon, there was not a speck of Fluttershy's earlier "accident" on her coat. Fluttershy panted, overwhelmed with pleasure.

"You really liked that, didn't you sweetie?" Rarity asked the orgasmic Fluttershy

"Wes. . . Mommy. . ." As Rarity moved to pleasure Fluttershy's once again, a single touch was all it took. Fluttershy could feel the hot mare-cum as it sprung forth from her. She moaned once more as waves of pleasure washed over her. "Oh Cewestwia, I wuv you!"

"My, my. . ." Rarity started, a seductive tone in her voice, "Somepony's being a very naughty filly. She just cummed all over herself! And just after I cleaned her up too. . . . Well, I guess somepony needs to be punished again after I clean her up!"

"No Wawity, I'm done with da pwunishments!" Fluttershy argued, lisping through her pacifier. "You've been pwunisin' me aw day! I'm done!" She said as Rarity took another wipe and cleaned off the mare cum. "Not that I didn't like what we just did, but tone it down a bit."

"Oh, do I hear back-talk?" Rarity was clearly in too much heat to listen, "I think somepony really wants to be punished!"

"Wawity, I—"

"Whose my naughty widdle filly?" Rarity cooed, ignoring Fluttershy completely, "Yes, you are! Naughty, naughty, naughty girl!"

"WAWITY!!! STOP IT, PLEASE!!!" Fluttershy yelled. Like, she actually yelled. That's how fed up she was.

Rarity fell silent, "D-did you just yell at your mommy?" She still wasn't listening, "Well that is it missy!" Rarity quickly used her magic to powder and diaper Fluttershhy up, making sure it was on nice and snug.

The first thing Fluttershy noticed was how thick the new diapers were. In fact they were so thick that they noticably spread her hind-legs apart. She was barely able to coplete the thought as Rarity sat down and swung Fluttershy over her lap. It wasn't too hard, considering how hard it was for her too move in the thick diapers.

Rarity wasted no time. As Fluttershy struggled against the magical aura that now enveloped her, Rarity swatted Fluttershy's diapered plot multiple times. Since Fluttershy's diaper was so thick, she didn't really feel anything at first, but soon it started to sting. Her vision became clouded with tears of frustration. Sadly, she couldn't do anything but take her beatings like a good girl.

Soon, however, Rarity was finished spanking her, and Fluttershy's plot stung. ALOT.

Then Rarity felt a twinge.

A twinge soon turned into a life-or-death situation.

Rarity had to pee.

She ran out to Silver Lining and asked where the restrooms are, crossing her legs in a futile attemp to keep the floodgates at bay.

"We don't have bathrooms." She answered simply. This was news to Rarity, as she'd never had to go when she'd come in the past.

"What? Why?" This was it. She was doomed.

"Well duh, just look at what we sell." Silver said, gesturing to the store around them, "Having a bathroom would be kind of pointless. In fact, the only ones who come here not wearing diapers are the ones who come to buy their first diapers, along with a few others. A bathroom would be a waste of money."

"What am I supposed to do then?" Rarity whined, desperate to relieve her aching bladder.

"Well, you can always put on one of your foal's diapers." Silver suggested, "That is what they're for."

"But I can't use one of those!" Rarity squirmed at the thought, "That's so icky!"

"Suit yourself, but I'd rather not clean up a puddle on the floor."

"Ugh, fine." Rarity gave in, too desperate to bother with a better solution. She ran back over to the changing room where Fluttershy sat, confused. Using her magic, she quickly taped one of the thick diaper around herself. She lay back, prepared to alleviate her bladder. It didn't take long for a steady stream of warm urine to release into the soft padding.

Ah... sweet relief she thought, as a comforting warmth spread throughout her nether-regions. Fluttershy watched with curious eyes as Rarity relieved herself. It felt so strange for her to watch somepony else pee themselves. Of all people, she never thought Rarity would ever wear a diaper, let alone use one.

"Um. . . did you have a nice potty-break, Mommy?" Fluttershy decided that it was her turn to tease Rarity.

"Ew! Gross, gross, gross!" Some things never change Fluttershy thought as Rarity freaked out about her little "accident." "It's so icky! How do you sit in these things for hours on end, Fluttershy?!" Fluttershy shrugged. She'd never really thought about it, she just liked it.

Rarity moved to remove it, but was interrupted.

"And don't take off that diaper until I've seen it!" Silver warned from just outside, "Store policy, we don't let anypony take off a diaper if it isn't completely used!"

Rarity saw no problem with this, and stepped outside to be checked. Silver took a hoof right atop Rarity's crotch, and moved it to the back. This checked for dampness while also pushing the wet padding against Rarity's coat, much to her disliking.

"You're dry, so keep that on." Rarity's eyes narrowed. "Go home to change, or stay and use it some more, but you're not wasting it!"

No way Rarity thought I wet myself a ton! Must be because of how thick these infantile things are!

She assumed she would have to walk home in the partially used diaper. As much as she didn't want to, she had no other choice.

Before she left, however, she had a few other things to buy. Despite Fluttershy's protests, Rarity was going to buy potty-training supplies. Fluttershy had waken up wet every night, and decided it was enough. Today, she would start potty-training. Rarity couldn't change Fluttershy's poopy diapers forever, she reasoned.

"But I wike my diapees! No wanna go on da potty!" Fluttershy argued.

"You'll be able to go in your diapers all you want, but I want to be sure you can go without a diaper if need be." Rarity explained, "You know how hard it's been hiding our little playtime from the girls. It would be much easier if you didn't need those bulky things. At least a Pull-up would be easier to hide."

"Um. . . well. . . okay. . . ." As much as Fluttershy wanted to stay in diapers forever, Rarity had a point. She followed Rarity to pick out these super cute, pink Pull-ups with Celestia's cutie-mark on them. Fluttershy actually found herself excited to wear them, as hipocritical as that may be. They then went to get a plastic training potty. Fluttershy didn't think such a thing was necessary, but Rarity argued that it would be easier for her to make it to the potty if the toilet was in her play room. Defeated, she settled on a blue one with Luna's cutie mark on the side.

Rarity hadn't forgotten her diaper, however. Quite the opposite, in fact. Every move she made pressed the sodden material against her more sensitive parts. It was so. . . pleasuring. . . but she pushed those thoughts aside and instead thought about how icky it was, walking around in her own urine. Despite this, just as they were about to leave, Rarity felt a pressure in her bowels.

Because there was no bathroom nearby, and she had already wet herself, Rarity gave in, stopped, and squatted down. She contorted her face, preparing for the inevitable. She winced as she felt the hot, goopy mess work its way into the back of her diaper, filling the room with an aweful stench. Rarity figured this was a good time to get changed. As she called out to Silver Lining, she heard no response. In fact, no employee was in visible site.

Oh no Rarity thought I'm going to have to walk home like this?!

"Come on Mommy, let's go!" Fluttershy grew impatient in her foalish headspace.

"Ugh. . ." Rarity almost wanted to cry, but held herself back, "Fine. . ."

"That's what you get." Fluttershy muttered.

"What was that, sweetie?" Rarity asked, not having heard the naughty filly.

"Um. . . I can't wait get home!" Rarity raised an eyebrow at this as if she didn't entirely believe that is what was said, but shrugged it off, trying to distract herself from her freshly soiled diaper.

And with that, the two foalish mares walked back through the automatic doors, their thick diapers out behind them.

Author's Note

So, Rarity is wearing a diaper now! Will she get what she deserves? Stay tuned to find out!

This story is coming to its close. I plan to have 5 chapters and possibly an epilogue. However, I hope to have a (if not multiple) sequel(s)