If you had been to Ponyville, chances are you had run into Pinkie Pie. Everypony knew Pinkie Pie; she made it a point to introduce herself to anypony and everypony that she met, and throw a big party in their honor. Parties were her bread and butter, but the ponies who lived in Ponyville also knew her as one of their resident bakers and, by extension, the most avid consumer of sweets this side of the Crystal Mountains. If you had a cake, muffins, cupcakes, candy, or anything that even vaguely smelled of sugar, it was very likely that the pink pony had already taken a bite. This diet of Pinkie's did come with one massive consequence. Literally.

Her shits were enormous. Not so much a problem for her, as she seemed able to stretch herself wide enough for it to escape her system without too much hassle, but for any toilet unfortunate enough to be exposed to her candy coated rump, it was practically a death sentence. It became so problematic that the Cakes insisted that Pinkie find another means of disposing of her waste, instead of costing them another plumbing bill.

Among all the solutions suggested, Pinkie seemed very keen to try out on e in particular: Using diapers instead. This was something the elder bakers found unusual, but as long as it meant that their toilet didn't fall into disrepair, anything was better than nothing.

The idea wasn't as simple as Pinkie had made it out to be. Her first instinct was just to borrow from the same supply that the two baby twins used. While the whole family was away from the bakery, Pinkie helped herself to one from their supply to test out. Though it was an EXTREMELY snug fit, Pinkie had somehow managed to secure it around her waist, marveling aloud at just how cute she looked wearing it. As soon as she had snapped the last bit of tape in place, she let go and started pushing, her shit rapidly coiling within the diaper's tiny confines before it became too much for it to contain and quickly started seeping out from the leg cavities and leaving a large pile on the floor surrounding her. Pinkie managed to get the room cleaned up before the Cakes had returned, but she knew she was going to have to find her own special supply to draw from going forward.

The next few days were tense. Pinkie had ordered a large box of some more custom fit diapers, and was eagerly awaiting their arrival, checking the mailbox almost every ten minutes. Her fellow bakers were just as antsy, praying that they arrived before Pinkie actually needed use of them. Thankfully, the mail pony arrived with them just as Pinkie had checked the mailbox for the 283rd time, and she immediately took the supply up to her room to test them out, her excitement still baffling the two Cakes.

The truth was that there was another reason Pinkie's visits to the bathroom were so excessive. Pinkie always wanted to be able to just shit herself instead of going to use the bathroom, but she could never find a reason to justify making a mess of her laundry (though she had been sorely tempted on more than one occasion) or to add the the Cakes already large messy diaper count. So she started to hold it in until the very last moment, and found out that she absolutely loved it, though it only added to her desire to fill whatever undergarment she was wearing at the time. Now that Pinkie had given them a solid reason not to question why she was getting diapers in the mail, she was finally ready to indulge herself.

Pinkie popped out of her entire outfit with one bounce, and tore open her package to find at least a dozen baby blue diapers decorated with little sprinkles. She pulled one out of the box and gently tugged at the waistband, feeling the firm but stretchy fabric pull back against her fingertips. She quickly slipped it over her hips, the fairly large padding spreading her gait wide. Not that it mattered; she preferred to spread her legs to shit and, hopefully, her poop will be large enough to spread it even further.

Pinkie placed her feet on either side of herself, opening her legs and bending her knees to give her poop the easiest time escaping her confines, and pushed as hard as she could. The gigantic log quickly vacated her bowels and filled the diapers interior within seconds, expanding it far beyond even Pinkie's expectations. Just as she had hoped, her diaper swelled enough under her to take her own feet off the floor, forcing her to sit and surround her ass with the nonstop log pouring out of her insides.

With her ass firmly nestled within the growing shit beneath her, Pinkie's mind focused entirely on the incredible arousal that was painting the front of her diaper as she stuffed her hand between the stretched padding and soaked lips, thrusting three fingers as far into her pussy as she could. She furiously pumped her digits in and out of her vagina, rubbing her ass further into her own feces. Her diaper had grown to the size of a bean bag, and Pinkie was desperate to use it like one.

Pinkie's mind was drunk on lust, only focused on increasing her pleasure by whatever means necessary. She removed her fingers from herself and planted both her hands squarely on the front of her diaper, shoving and grinding it against her eager lips as her shit continued to smear everywhere behind her. Her climax hit her like a freight train, her pussy gushing right into the folds of her diaper as she grabbed hold of the pocket of shit that had swelled in front of her, digging her hands into its crinkly surface.

When Pinkie had finished riding her orgasm out, her hands wandered over the surface of her freshly soiled diaper, squishing the contents with and gently bouncing on top of it. This was even better that what she had been hoping for, and she was looking forward to doing it again in another day or two.

Now she just had to figure out how to get the dirty diaper to the dumpster out back.

Author's Note

So I'm doing something a little bit different for the next two chapters. They're both going to play off of the same event, but tell two different way the story would've gone. Hope you look forward to it!