You continue shoveling more shit inside your mouth and quickly discover that it doesn't seem to be running out at all. With each handful you swallow there's always more to come, as it always propels you to let out a loud, nasty fart and refill the diaper anew. You always shit out more than you eat, and yet your excrement-filled gut keeps on growing and producing even more waste that immediately pushes past your sphincter. Making the diaper overflow to the point where dark-brown manure continuously slides down your legs and piles up on the floor around you. It's so delicious, but there is so much of it that it would be impossible for you to eat all of it up. You know you simply can't let any of it go to waste! When you hear someone shuffling around the changing room, your corrupted, bestial mind comes up with a perfect solution to the problem - you are going to share it! You swiftly stretch out your massive, bigfoot arms and pull whoever it is inside.
It turns out to be a slightly overweight, middle-aged janitor, undoubtedly lured here by the overpowering stench of all the steaming shit covering the floor. His eyes go wide in fear when they see you and he attempts to scream for help, but you are faster. You shove a large handful of warm dung inside his mouth and hold it shut until you're sure he'd swallowed all of it. The janitor thrashes around and attempts to spit it out, desperately trying to push away your furry, bestial hand that holds his jaw shut. Bits of warm, liquid shit mixed with his spit ooze out of the corners of his mouth, dyeing the tips of his white, walrus mustache dark brown. It pains you to see so much of your fresh, delectable shit going to waste, but you know that most of it had already made its way past his gullet.
Suddenly something changes, the janitor's thrashing grows more violent but rather than pulling on your arm, he begins to claw at his uniform as his fingers elongate and grow thicker, and large patches of grey fur sprout on the backs of his hands. His eyebrows grow bushier and steadily connect with each other, forming a white, furry unibrow. While his mustache quickly follows, first turning into a pair of mutton chops surrounded by a field of dense, white stubble, and then into a full on, unkempt, wild beard. The janitor's body grows massive, shredding his uniform as his large gut and bestial muscles expand. Thick, grey fur continues to spread, soon covering every inch of his skin save for his face, the palms of his hands and the top of his bald head.
The realization that unlike you, there is no zipper on his back, and you've just permanently turned someone into a fellow, fat, shiteating bigfoot arouses you so much, you involuntarily unload both in the front and the back. Filling your diaper to the point of overflowing with a mixture of tainted, yellow cum produced by your fat sasquatch member and hot, steaming shit coming from your other hole. You scoop up as much of it as you can and present it to your new, beastman brother. He looks scared, turned on, but most of all hungry and when the first whiffs of the mixture's pungent stench hit his nostrils he is unable to hold back and shoves as much of it as he can down his throat.
Without any warning whatsoever, a massive fart erupts from between his furry buttocks and fills the entire changing room with green, noxious gas. Its vile stench turns on both of you even more as you start to kiss and shovel even more warm, delicious shit into each other's mouths as you beat your massive, beastman cocks in unison.