Fluttershy was sitting in her bathroom tub, wondering how exactly she had come to this point. Here she was, resting on the balls of her feet, holding her ass slightly above the cool surface of the tub, patiently waiting.

Oh, and she was wearing a thick padded diaper.

Under any other circumstance, Fluttershy would've never even considered the possibility that she would've ever worn one again, but the butter pegasus was swiftly reminded by the pressure gently prodding against her anus why she found herself here, and what she was hoping to accomplish. That fateful day coming from the marketplace...

Fluttershy had just finished her weekly market run for supplies, and just in time too, as she could feel a slight pressure in her stomach, driving her to make her trip back home a swift one. She was never too keen to stop off to use a public restroom; far too many ponies in what should be an extremely private area. No, she would rather do her best to hold on until she arrived back at her cottage.

Of course, her trip was not without its interruptions. A small line of ducks who needed help crossing the road, a family of rabbits stranded on a drifting log in the creek, and a rainbow pegasus who insisted on telling Fluttershy all about her amazing new stunt. Throughout all of this, Fluttershy could feel the edge of her anus tingling; she needed to get home, and badly. After excusing herself from her conversation with Rainbow, she livened her pace, hoping to reach her home (and bathroom) in time. With every step, she felt the pressure continuously peck against her nerves, urging her to let it go.

By the time she reached the pathway up to her cottage, her body was nearly at its limit. She could feel her bladder start to echo her bowels, nagging her with their need to release. She fumbled with her key, her hands shaking from the sheer effort she was putting into holding back for just that little bit longer. She almost had it when a particularly strong press against her back door made her drop the keys from her grasp. Bending over to pick them back up, she felt her desperation reach a peak, and finally burst.

Torrents of piss began streaming down the sides of her legs, the front of her panties completely soaked through and leaking onto the ground. Fluttershy collapsed to her knees, unwilling to acknowledge the accident she was having in front of her own home. It felt humiliating, relieving, disgusting, and... strangely intoxicating. Her body registered the warmth and wetness that now coated her pussy lips, giving to a slight arousal. Fluttershy tried to catch her breath and dismiss the sensation, but another push at her anus reminded her that she was not done. Slowly but surely the muscles in her bowels gave way, letting a large log of shit push its way out of her ass and into her panties. Fluttershy could feel it fold in over itself, struggling to stay confined in the cloth prison it found itself in. She couldn't help but let out a soft moan, feeling even more warmth trapped in her panties.

The turd eventually tapered out of her anus, gravity pulling it to sit at the very bottom of her panties. Fluttershy gently brought herself back to her feet, the weight of the large shit in her panties tugging them slightly below her skirt. If anybody came to her house now, they would surely see the accident she had. Fluttershy couldn't explain it, but this thought made her feel even more aroused. Was she excited by her own accident? Even more if someone witnessed it? She wasn't sure, but a small shift in her panties reminded her that she should probably get herself cleaned up. She pulled out her key once again and retreated quietly into her cottage.

That experience didn't leave her head for weeks after. Despite the gross amount of humiliation she felt in soiling herself, a part of her longed to replicate the feeling. It was a strange, new experience, and if there was anything that her time with Discord had taught her, it was that any experience could be a good one, no matter how abnormal it seemed on the outset. This is what brought Fluttershy here, having prepared for at least a week to make this attempt an even bigger mess than her previous accident. Having felt that today was the day her bowels would reach their limit, she spent her whole morning drinking as much fluid as possible, and retreated to the bathroom tub, where she waited for her bladder and bowels to egg her on into another accident.

As for the diaper, while she was keen to replicate the sensations she experienced outside of her door, she was not so enthusiastic about the mess it created; she had to spend hours washing just the one pair of panties. She was also pretty happy with the diapers she had procured, a plain white with some soft baby blue accents and a baby duck that decorated the front. Fluttershy gently cupped the underneath of her diaper, pressing her hand against the crinkled padding that gently rubbed her pussy, and reassured herself that this would be a decent substitute. She hoped so, anyway, as she had no idea what to do with the rest of the pack if this didn't turn out as satisfying as she hoped.

A sharp pain in her bladder told her that it was time for release. Fluttershy gently faced towards the wall of her tub, placing her hands behind her to grant her a little more support, and began to piss into her diaper.

It felt even better than she had imagined, the diaper doing a better job of absorbing all the pee she poured into it, eventually lightly overflowing and forming a puddle within the diaper that enveloped her pussy in the warmth of her urine. Fluttershy softly moaned at the sensation, cupping the front of the diaper and pressing the soiled padding further into her pussy, rubbing it against herself. She could already feel her arousal building to a fever pitch, and she hadn't even gotten to the best part yet. Planting her hands back onto the edge of the tub. she lifted herself further from the floor, and let the pressure in her bowels release.

Fluttershy felt the solid log rush to meet the air outside of her ass, wasting no time in filling the back of her diaper. She hadn't realized just how much she had held within herself until she felt it being trapped against her cheeks, pushing the back of her diaper further and further out until it nearly reached the floor of the tub despite how high Fluttershy had raised herself. The weight she felt under her only added to her growing arousal, as she leaned towards her left hand so her right could attempt to cup the underneath of her diaper. She gently kneaded it in her hand, feeling each coil of the turd wrapped throughout the diaper, and she could still feel more coming. She continued to push, not resting until every little bit of it had entered its new home.

A few more minutes passed before she felt the last bit taper off and drop into the diaper, the only sounds left being her heavily excited breathing. She gently lowered herself, letting the bottom of her diaper just barely graze the floor of the tub, feeling the mound of shit press firmly back into her ass. Her free hand had made its way back to the front of her diaper, pressing the piss-soaked padding against her puffy lips. Her moans came far more frequently as she began to masturbate herself with the front of her diaper. She had never felt something so intoxicating, the mass within her diaper gently flattening against her cheeks the more she pressed into it, the heat of her own excrement setting a fire in her loins unlike any other.

Then her left hand slipped, and she fell sitting in her messy diaper, the shit pressed thoroughly throughout her ass, and the raw sensation of feeling her ass trapped within its warm, soft prison sent a jolt of ecstasy through her body. She came right into her soiled diaper, her moans escalating to screams of arousal. Several spurts of girlcum joined the piss in her diaper, coating its surface and adding to the wonderful sensations Fluttershy was already experiencing.

Slowly, her orgasm faded away, and Fluttershy brought herself back to her feet, carrying herself over to her bathroom mirror to get a good look at what she had just done to herself. She was met with a sight that, had she not just experienced herself, she wasn't she'd have ever seen it. Her diaper was heavily discolored, a bold yellow in front that softly transitioned to brown at the very bottom. It sagged to just above her knees, and she had a feeling that, had she not accidentally sat in it, it probably would've reached down even farther. She could see small pieces of her shit had been pressed out of the leg holes, but for the most part everything remained within the diaper. She gently pulled one of the leg holes open, exposing the massive pile contained within, and just seeing the mess she made of herself sparked a slight arousal once again. Oh well, she needed a shower anyway.

As she undid her diaper and stepped into the shower, she wondered just how long it would be before she could do this again. It took her quite a while to save up so much, and with how intense it felt she wasn't sure she wanted to wait that long. Maybe there was something she could do in the meantime, or maybe she could come up with something to make it even better the next time...

Maybe somebody could watch her do it.

Author's Note

Thanks for reading! Feel free to suggest any characters you'd like to see in future one-shots, or if you'd like to see a continuation of this one!