There’s two clean versions here, go look at those instead:
with panties “>>[Derpibooru]2904265”:https://derpibooru.org/images/2904265
nude “>>[Derpibooru]2904016”:https://derpibooru.org/images/2904016

Also here’s the pee version
“>>[Derpibooru]2904750”:https://derpibooru.org/images/2904750

I’m fully aware most of you aren’t into this. No need to let me know. You don’t have to look.

Alright, for the rest of you, story time!

Scootaloo read through the label on the unassuming pink bottle, mouthing out the words like she had many times before. She’d been hiding it under her bed for weeks now, just waiting for the right time to give it a try. She had been +desperate+ to do it as soon as she picked up the bottle from the pharmacy, but since she had been unsure of what or how strong the actual effects might be, she had decided to wait until she had total privacy. This weekend she finally had the house for herself.

Her heart was pounding with anticipation. This was it, she was finally going to try something she’d wanted to do for a long time. She cracked the cap of the bottle and lifted it up to take a huge gulp, then another, of the sticky and disturbingly sweet, opaque off-white liquid.

“Yuck.” She smacked her lips. Even Pinkie would find it too sweet. It was almost nauseating.

She weighed the bottle in her hooves, trying to figure out how much she’d taken and if she should do more. “Yeah, that should be about right.” She set the now half empty bottle on the toilet seat.

She looked over her shoulder, admiring herself in the mirror she had stood on the floor. She frowned a little as the panties weren’t sitting right, binding and bunching up a little too much. She pulled them down a little and up again, adjusting them so they hugged the contours of her backside perfectly. She would never admit it, but she did enjoy dressing up in frilly dresses and panties as much as the next filly. But everypony needs a secret or two.

Her other secret was a lot more embarrassing - she would probably just drop dead if anypony ever found out… but it was even more exciting. She didn’t know why, but as long as she could remember, she had been fascinated by the thought of ponies pooping themselves. One time she had seen one of her friends have an accident in class and she hadn’t been able to get the thought out of her head for months.

There was something about somepony losing control and going to the bathroom in their clothes that made her feel very peculiar and it had led her to experiment with it herself. For a while now she had been “misplacing” a pair of undies every once in a while, hoping her aunts wouldn’t question where they had gone. But pooping herself on purpose, while definitely fun, didn’t have the same feeling as having a real accident did. Of course she had had those real, actual accidents too (well, probably more than the average pony - she had a very sensitive stomach). While she’d often find herself thinking about those times long after the fact, having an accident because she had a stomach bug or ate something her tummy didn’t agree with wasn’t really that fun at the time - for several reasons.

This time it was more exciting though, and she tingled with anticipation as she now waited to totally wreck her panties with a “real” accident, while being able to enjoy the experience fully - which would hopefully be happening soon.

“I wonder how long it’ll take?” She wondered to herself. “Didn’t say anywhere on the bottle.”

Looking at it again, something caught her eye. She re-read the instructions on the label again. “Oh horse apples, it was +caps+, not +cups!+,” she said out loud, while comparing the volume of the bottle cap to what she’d just consumed. An uneasy weight sank in her stomach and sweat began to bead up on her forehead.

“Recommended dose… well, that’s like, a recommendation? Good thing I’m not a coward,” she thought to herself.

The overpowering sweet taste still lingered in her mouth. Figuring she’d have plenty of time, she went back downstairs and trotted into the kitchen. She had to have a drink after all that sugary goo, so she poured herself a glass of water. After gulping it down she leaned against the kitchen counter to put her glass away. It was then that she felt something shift inside her bowels. It was the kind of movement that meant that “hey, you kinda need to poop soon but not right now, maybe you should try farting a little ;)”.

Yeah, not falling for that one this time. There was definitely something brewing inside her. She trotted around the house to pass the time, listening very carefully to what was developing inside her belly.

After some minutes, Scootaloo suddenly heard somepony talking outside. She rushed to the window to look, but thankfully it was just some random ponies passing by and not her aunts coming back because they missed their train. Suddenly she thought that maybe she hadn’t been as prepared as she should have been. She remembered the front door was probably still unlocked, and somepony walking in would soon find the house smelling like an outhouse and her looking like she went wading in one. As she stood upright to try the handle, she felt the same shifting feeling deep in her lower bowels again, only stronger. Instead of passing quickly, this time her stomach gurgled like a drain after removing the plug. Her tail suddenly had a mind of its own too, hiking up and over her back.

“Oooh-” she moaned, as her legs began to shake, “horse apples.”

It took all her power of will to force her tail back down to keep herself from soiling herself right on the spot. She briefly considered the downstairs bathroom, wondering if she should just run there, but it didn’t have a floor drain or a shower. It would have been a nightmare to clean up afterwards if she tried to have her fun in there, but giving up and just letting it all explode into the toilet bowl now would have been a huge disappointment. She was determined that this was going to be anything but.

As she stood back down on all fours again, she almost doubled over from the sharp discomfort in her stomach. The quivering motion was constant now and with every second she could feel it moving further down towards her backside. The unbearable rumbling in her belly let a huge fart escape her rear end. The pressure on her stomach lessened, but the back of her undies felt a little slippery afterwards. She was lucky that she had at least something solid in there, that she could still hold on to. The way upstairs had never seemed so long, as she hobbled up the stairs like a filly who had taken several times the recommended dose of laxatives, her flanks stiff from clenching her leaking ponut and one hoof cupping her backside as tight as she could.

By the time she finally made it back to the bathroom, her tailhole had given up. The head of a solid log was already poking into her panties, but at the same time it was acting as a plug that somehow had managed to keep the rest in. Scootaloo leaned against the toilet, her legs shaking so much she could barely stand. As soon as her hoof lifted from her ponut, a huge slippery log began to slide out, skating along her most sensitive parts and making the back of her panties bulge out. Having let go, her aching belly immediately followed up with soft mush that poured out of her like soft serve ice cream, only hot and stinky (and actually not like ice cream at all).

The constant mudslide forced her panties out to their absolute limits. Steaming hot, mushy, stinky, filthy, creamy, amazing manure filled every crease and fold and when there was nowhere else for it to go, it began to spill out and fall to the floor with loud splatters. Scootaloo moaned in ecstasy from the immense relief and excitement from how completely helpless she was to stop soiling herself like a sick filly. Soon it had lost any consistency it may have had, turning almost completely liquid with only the odd undigested bits of ruffage mixed in.

When, what she was sure was just the first round, was over, she turned to look at the mirror again. Her panties were filled to the brim from back to front with mushy manure, soaked through and completely beyond any chance of salvaging. Any movement she made caused more of it to dribble out and run down her legs. Liquid and semi solid filth had spilled out around the edges of her undies, ran down her legs in a brown waterfall and just splattered all over the floor. Even her reflection in the mirror was spattered.

The smell was beyond words.

Scootaloo’s hoof wandered between her legs to squish the steaming hot mess she had just made. She shivered, not sure if it was from disgust or delight of how absolutely filthy she was. The feeling was amazing. She only knew she wanted to do it again, but maybe next time somewhere a little more risky and exciting than her own bathroom…

And with that thought she could already feel round two beginning…

imported from https://derpibooru.org/images/2906744