The hands of the classroom clock sat frozen like time itself had ground to a halt. The minute hand inched towards the top of the hour with the pace of a mountain climber, while the hour hand crept down like the laziest of sloths coming down for his weekly dump. Button sat at his desk, barely able to contain himself and much less able to concentrate on the last lesson of the day. Best he could do was try to look normal, but he was pretty sure he was failing at that too.

He had planned it all out, but now, as sweat was beginning to bead up on his forehead as his discomfort grew unbearable, he was beginning to doubt if he had gambled too much. He tucked his tail firm against his backside, feeling the dampness from his sweaty ponut leave a slick wet spot on the chair like the older fillies sometimes did.

It had been, how many, days since the last time he’d went? Last time was Sunday morning… so all week. He’d been holding it since his mom had asked if he’d be alright being by himself next Friday, since she’d be home very late. It was an opportunity too good to pass up on, one he’d been waiting for forever since he’d discovered his new favorite thing (not knowing what a ‘kink’ was, yet).

It was hard not to think about the landslide of manure bulging inside of him. In fact, it was all he +could+ think about. Being an earth pony, Button was no stranger to taking huge dumps, but this was just excessive - and oh so exciting. There had to be several pounds of it, he was sure of it. And it was all pushing down against his tender prostate - sore from being squished and massaged between his lumpy bowel contents and the equally hard surface of the chair all day. He’d been edging himself like this for hours now (involuntarily, but it was a bonus!). By now his balls felt like two ripe plums, swollen and in desperate need of emptying as they were nestled firmly against his sweaty backside. His tail hole wasn’t faring much better - that quivering ring of muscle was all that was keeping him from releasing his shame for everypony to see. And it was growing more tired by the second.

He’d withheld from touching himself for days now, too, and it was getting just as unbearable. His cute little glue stick was throbbing against his belly, rock hard and eager, and despite his relatively diminutive size, only barely hidden from his classmate’s view between his tensed up legs. He could only hope nopony noticed and that if they did, that they’d chalk his shameful erection up to being one of those things that sometimes happened to colts. Nopony wore clothes after all, so it wasn’t that uncommon to see somecolt suddenly go a little stiff or somefilly give an unintended wink (often these things could cause chain erect- reactions, too!)… but somehow he suspected they wouldn’t buy it this time.

He wanted to touch it so bad, if only to tuck it away further from any prying eyes, but he dared not to – for fear of splattering his stored-up, sticky colt glue all over the underside of his desk. Just feeling the heavy mass of his bowel contents shift and poke deep inside him, tickling his innards from within, was enough to coax out the occasional bead of velvety precum from his eraser tip. With each fear-inducing twitch of his constantly pulsing shaft, he knew that cumming now would make him go, too…

…and at that moment Button became aware of what a self fulfilling prophecy was, as that very though made his cock twitch and spit a stringy rivulet of his thick seed, smearing against his belly and dripping down his throbbing shaft. He felt his tailhole loosen for just a moment as his other load wanted to peek out, but he clamped down on his bottom as hard as he could, desperate to hold it a few minutes longer. With his heart thumping in his throat, he knew he’d just left a skid mark on the chair. For the moment he could do nothing more than smear his leaked boy yogurt deep into his coat with his hoof, hoping nopony would notice his little protein spill.

When the bell finally rang he was the first to push his chair out with a deafening creak, making a deliberate effort to slide his plot across the chair to wipe the marks he’d surely left. He could only hope what had peeked out of him matched his coat color well enough, so as not to be completely obvious to everypony. He didn’t turn back to check if the chair still had a stain – that was something to find out on Monday… or something for the cleaning pony to discover. He just threw on his saddle bag and ran, with his tail tucked flat against his backside.

With his stiff colt parts slapping against his belly and sprinkling the grass with tiny droplets of precum like particularly sticky morning dew, Button made a beeline for home. Getting up on all fours had helped relieve some of the pressure on his backside, but only up to a point. He could now feel the imposing mass sag lower, making him keenly aware of its gravity by how it jolted and shifted in his belly with every gallop he took. He was honestly beginning to worry if he was going to tear something when it finally began to come out, or if he even could get it out. He could take a little pain for that big, amazing release that he’d been dreaming about all week – just not anything +bad+ enough that he’d have to tell mom about.

He ran home in record time, slamming the door shut behind him. Only then he took a quick glance at his flank and was slightly mortified when he saw what seemed to be a piece of corn stuck to his rump - in the middle of a smear that didn’t quite match the rest of his natural coat color.

Maybe nopony had noticed.

For the briefest moment he wondered what a nightmare it had to be to check and double check for somepony like Rumble or Sweetie Belle (especially Rumble, with his pegasus gut that made him have a mud butt all the time…). But there was no time to dwell on such things, as his bowels (and his cock) were not willing to wait a single minute longer.

He called for his mom just to make sure he really had the house for himself. When there was no answer he hurried to the bathroom, his ponut already beginning to leak. He hastily kicked the bathmat aside, revealing the shining tile floor underneath. He was tap dancing in place as he swung his rear around to get a good look of himself in the full length mirror on the opposite wall. Seeing how semisolid muck was leaking out from his spread open tail hole, now being gaped wide by the head of a compacted turd that was slowly inching forward, he knew he had achieved his absolute limit.

Button took a deep breath and began to push, feeling shivers running down his spine as his body gave in to the wild peristaltic motion in his belly. He could feel his anus give way and stretch as the full bulk of his massive bowel movement began to force its way out of him, opening him wider than he’d ever been before. It was everything he’d fantasized about - there was no pain, only a firm, all encompassing pressure and release.

He was panting heavily by the time the first horse apple was ready to fall out. There was a loud slap as it finally broke off and hit the floor, then another as the mass began to pick up speed and break up upon exit. He could feel his waste fall, roll, slide and smear against his colt parts, bringing him closer and closer to the edge. His cock throbbed and leaked goopy semen in time with every new twitch in his body. It demanded for release and to be touched, and to deny it was pure torture, but Button held firm, instead focusing in his mind on his deepest, most intimately held secret fantasies as he was lost in pure sensation.

As his mess accumulated on the floor, he couldn’t help but step in it. It squished and squelched under his hooves, mushing out from under his step like thick, straw-filled clay (and corn from yesterday and pieces of pineapple from the pizza from the day before yesterday, too!). As he waffle stomped, his leaky cock kept brushing against his legs. It was enough to finally push him over the edge and Button gave in to the most intense orgasm he’d ever experienced.

The powerful orgasm turned him into a passenger in his own body. As his waste was forcefully expelled from his bowels, the solid feces massaged his prostate, forcing him to keep cumming… and cumming just forced him to poop more, driving his pleasure ever higher. For a moment he was stuck in a loop of pooping from cumming and cumming from pooping, over and over and over again. His entire body shivered as thick ropes of ejaculate poured, spat and sprayed out of his colt meat. The throbbing shaft flailed wildly, slapping his belly and splattering its thick and creamy foal batter all over the steamy, mushy mess he’d made all over the floor. Outside, birds took flight and ponies passing by stopped to listen in morbid fascination to what was happening inside, but he himself could barely hear the beastly sounds he was making through the haze of pure ecstasy.

While it all only lasted a few seconds, it felt like minutes. When it was finally over he was left sweaty, panting, completely satisfied and… and…

As his cock grew flaccid, still dripping, his senses came flooding back. He looked at his thoroughly soiled hooves and the mess on the floor – the mess all over himself and the cum dripping from his belly. The room stunk like an outhouse… +and+ weirdly a lot like his mom’s bedroom after she’d had one of her stallion friends over for the night.

How in Celestia’s green Equestria was he going to get the smell out?

Clean version here, go look at that one instead:
“>>[Derpibooru]3536226t”:https://derpibooru.org/images/3536226

imported from https://derpibooru.org/images/3538709