Trixie chewed. She chewed and chewed, oozing rivulets of chocolate icing dribbling down her heavy, bloated cheeks. She chewed and chewed, mashing the bites of cake in her mouth, icing and cake residue smeared around her lips.She chewed, and she swallowed. She belched loudly: "BOOORRPP!!". She smacked her lips, sending flecks of chocolatey spit dribbling down her three bulging chins. "Mmm," she hummed. "Cake."
"Just keep eating, Trixie," said one of the friendly ponies, picking up another massive slice of chocolate cake. She pressed it up against Trixie's fattened, piglike face. Trixie obediently started chewing.
Her body oozed and bloated, vast and immense. Trixie was so fat that walking was quickly becoming a thing of the past. Her belly was a puddling, rippling ocean of blue blubber, obscenely huge, rippling and churning as it stretched back to meet her giant, saggy butt cheeks. Trixie's buttocks were each bigger than her old, thin self had used to be.
A gurgle came from deep inside her. Gas hissed out from between her butt cheeks. Trixie paused her chewing. "Gonna..." she mumbled, dribbling cake down her front fat folds, "gonna..."
"Just keep eating."
Trixie kept chewing. As she did she cocked her tail back. There was a nauseating sound, a gurgling SPRLUUURTT, and huge amounts of horse manure began to issue from Trixie's backside. Her anus parted and flexed as she shat, making way for the gallons of sludgy feces. Trixie's eyes rolled back as she pooped, partly from strain and partly from the pleasure of release.
Trixie smacked her lips in between bites of cake. Almost at the same time, a loud, wet fart sputtered out of her anus, dribbling oozy poop down the crack between her huge butt cheeks. "I'm..." she mumbled, dribbling cake down her front, "I'm done."
"Just keep eating," said the friendly pony, offering her another piece of chocolate cake.