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Jeremy looked nervously at the dark colored bull sitting on his couch. His apartment was small, just two rooms, and the big stranger seemed to fill it completely with his mere presence. The bull was dressed like a biker, in jeans and white t-shirt with a leather vest, scuffed from the use. His aftershave had a sharp, clean aroma and was a stark contrast to the sweaty funk of laziness lingering in Jeremy's living room and his own, unkempt persona. Jeremy wore comfy pants and and shirt that should have been washed weeks ago, and had missed several showers making his hair and short beard matted with grease. Unlike the bull his body was slightly flabby from the lack of exercise, and his hips were quite wide for a boy.

Jeremy cleared his throat. “So… how this works?"

The bull's ears flicked, making the steel rings in them tinkle, and he took off his sunglasses. His eyes were deep brown, but they had a cold stare. “Well, you can start by calling me Coach." He grinned with a predatory glee.

Coach's voice was deep and masculine, which made Jeremy even more flustered than he was. He fidgeted on his sweat-stained office chair that he had wheeled out of his bedroom for the meeting. He had contacted the man who called himself Coach online in rather murky depths of the internet, and had no idea if he could trust him to be able to do what he had claimed. There was money involved and he was worried that he was going to get scammed.

“You told me that you could make me grow big… and in other ways too." Jeremy's voice was very timid now, and he blushed as he thought about his fantasies coming true. He leaned his hands on his knees and studied his knuckles intently, not daring to look up.

“Heh, you have no idea…" Coach dug up a small vial containing bluish gel from the pocket of his jacket, and tossed it on Jeremy's lap. He gasped and closed his legs quickly to stop it from rolling on the floor.

“That's the extract that primes your body for the transformation, fresh across the border." Coach continued with amused voice, and ran his tongue across his lips. It left the nostrils of his wide muzzle glistening. “But the change itself needs to be induced by a template. An example for your body to follow, get it?"

He got up and stepped close to Jeremy, looming over him as he whispered in his ear. “To become a big strong bull you have to smell a bull, taste a bull… constantly." His breath was wet and moist against Jeremy's face, and had a sour smell of unwashed mouth to it.

Jeremy suppressed his reflex to whimper, both from fear and excitement, and simply nodded. Coach snorted and patted his cheek mockingly.

“Good that we have an understanding. I'm going to laying out some ground rules. First, you'll do what I say, no questions asked, or the whole thing gets called off. I'll be sticking around for the entire duration to see that you get your daily dose of grade A bull, because that's what you're paying for." He grinned and eyed Jeremy hungrily. “Second, get up and take off your clothes, I want to see what I'm working with!"

Jeremy knew that something like this was possible, as had seen pictures of humans who had chosen to transform into anthros, but he still hesitated to disrobe in front of a complete stranger. However, an angry glare from Coach made him obey and he pulled his shirt over his head and wiggled out of his pants, letting both of them fall to the floor in a disorderly heap. He stood naked and shivered even though the room had been warmed up by the afternoon sun, the rays of light shining through a crack between closed curtains. They lit up glimmering motes of dust and fine mist of grease droplets lingering in the air.

Coach laughed, and smacked Jeremy's ample ass cheek. “Hah, you look pitiful! Now I get why you wanted to become a bull so badly, you're so weak!"

Jeremy blushed even more fiercely than earlier, and tried to cover his shameful body with his hands. He had a pudgy belly, a flabby chest with perky nipples on his little saggy teats, and his thighs were fat enough to chafe against each other. He had little body hair besides a scraggly bush hiding over his dick, and had a faint sour milk smell wafting from his unwashed armpits.

“I can't wait to get you fixed properly, boy", Coach said and popped open the vial.

He took hold behind Jeremy's neck with his meaty hand, and brought the bottle to his lips. Jeremy had no other choice but to swallow its gooey contents, and the gel slid down his throat like a wad of snot. Coach grunted in satisfaction, and without a warning he kissed Jeremy's lips. His wide bull muzzle covered the young man's entire mouth, and the passionate, hungry embrace stole his breath away. Coach pressed Jeremy against the wall with his body, crushing him with his weight, and slid deeper into his mouth with his thick warm tongue. They swapped saliva and made wet smacking sounds, Coach grunting and Jeremy sighing, until the larger male pulled out leaving the human panting breathlessly.

Coach lowered his head to lick Jeremy's chest, slathering it with long, slimy streaks of bull drool. He moved up along his neck and face, made a snorting sound and then spat on Jeremy's face, smearing the snot and spittle into his eyes and hair with his rough hand. Jeremy tried to protest weakly, but was silenced by the bull.

“Shut it, you sack of lard. Marking you with my scent is the first step, make sure that you don't wash it off!"

Jeremy nodded, both humiliated and aroused from his treatment. He could feel his skin tingling where the saliva was drying, and the thought of the smell following him for days and weeks to come made him shiver with pleasure. He was really going to stop being a human and become an bovine!

“You're going to need to eat well too", Coach patted Jeremy's chest, “it takes a lot of energy to transform someone as fat as you!" Jeremy could not tell whether he was trying to be encouraging or was putting him down. Maybe a little both.

“Like protein drinks and stuff?", he ventured.

“Wouldn't hurt, but anything fattening is good." He sneered. “At least you look like you're familiar with that. Let's get to it, you need to get stuffed."

With that in mind Jeremy ordered takeaway, and Coach popped out to get some groceries. He was back at the same time as the delivery guy, and soon they were seated around three piping hot pizza boxes. Each was extra large and laden with cheese and meats, dripping with so much fat that the cardboard had become soggy. Coach ordered Jeremy to dig in, and watched him happily shove big slices into his mouth. Grease dribbled on his chin and stained his fingers with glistening coating as he munched on the gooey cheese and spicy sausages, burping and stuffing his maw. He was done with the first pizza when he wheezed and patted his stomach. He felt heavy from all the rich food digesting at the pit of his stomach, and eased his pants.

“Ooof, I think I'm gonna take a break", he said, already sweating from filling himself up.

“Oh no you don't. You're going to eat all three of those, and you're going to enjoy it. I'll give you a treat afterwards." Coach smiled cruelly as he picked up another large slice, and pushed it to Jeremy's lips. “Eat up, that's a good boy. Don't you want to grow big?"

Jeremy could not reply because his mouth was filled with the soggy slab covered with greasy cheese. All he could do was to bite and and gulp, despite the protestations of his overfilled belly. He was stuffed to the brim by Coach, who made him to eat until he felt he was about to burst and then some more. It took more than an hour, but he managed to finish his meal, leaned back groaning, and laid on the sofa holding his stomach like overfilled balloon. He stroked his distended stomach, his hands dripping with grease and meat juices, smearing their stale smell into his skin. He was slipping into a food coma, cushioned from his aching insides by the pleasant high brought by massive intake of calories. His cock twitched, and he realized that he had become half erect simply from stuffing his maw like a glutton.

“Look at you, getting horny just from eating", Coach laughed, “you really must love getting fatter!" He thought about something for a moment, then continued. “Still, you did as I told so you should be rewarded. I have just the thing for you…"

He got up and rummaged through the grocery bags he had brought back, then returned to Jeremy's side with a big, brown muffin. It was moist and dark, smelled heavenly, and was dotted with chunks of rich chocolate chips. Just the thought of having to eat the heavy dessert made Jeremy groan again. Without warning Coach set the muffin aside and undid his belt. Right in front of Jeremy's incredulous eyes he whipped out his big fat bull dick, an red meat truncheon that poked out of his loose sheath, and jiggled on the palm of his hand. Jeremy could smell the stink of unwashed cock even from where he was, and as Coach pulled back his skin he could see yellowish frosting along its entire length.

“Take a good look, you're gonna have one of your own soon."

Coach looked very proud of his tool, and Jeremy could understand why--it was one of the thickest and longest that he had ever seen, crisscrossed with veins under its slick surface and attached to a pair of heavy, low hanging balls. Coach started stroking himself, grunting and making wet, shlicking sounds as his cock fully extended out of sheath and started to drool precum. The sight and smell of his arousal made Jeremy rock hard too, but he was too dazed to pleasure himself, so he just watched and drank in the scene with thirsty eyes. Coach grasped the muffin in his hand and smooshed it on his cock roughly, smearing it along his entire shaft. The moist cake squeezed between his thick fingers, crumbling on the floor and marking his cock with chocolatey streaks and buttery sheen.

He stepped in front of Jeremy, and hovered his messy cock in front of his face. “Lick it clean", he said with a condescending tone.

Jeremy shivered with lust as he took it in his mouth, gingerly at first because he was not sure he could fit all of it in. He tasted the bull's sweat and the sweetness of the cake, salty and musky at the same time. He started to slobber along along the shaft, rubbing the chocolate mess onto his face, licking and slurping it eagerly. It smelled delicious and rank and he huffed all its aromas in like rare incense. It did not take long for the bull to climax. He clenched his teeth and then erupted, shooting several thick jets of his semen over Jeremy's face. It tasted bitter, but the flavor mingled with the sugary goop in his mouth turning into a pleasant aftertaste.

Coach laughed and clapped his hands. “Eager, I like that! Looks like you're greedy enough to suck cocks just to get something in your mouth!"

Jeremy blushed and did not reply. He felt satisfied, in more ways than one. After eating Coach let Jeremy to dress again, and told him to sleep it off--it would hasten the process if he could save up all his energy for the transformation. He went to doze off in his bed, still filthy with chocolate and pizza grease, and felt a warm glow starting to tingle in his body. There was certainly something happening within himself, and it made Jeremy more accepting towards all the weirdness Coach had subjected him to.

--

The following weeks Jeremy spent gorging himself, encouraged by Coach to stuff a heavy meal after another into his stomach, with liberal doses of cum served on top. Coach called it jokingly “bull mayo", and Jeremy could not deny liking its gooey saltiness. His body reacted abnormally fast to his diet, swelling to ever wider proportions. Soon his belly hung low between his knees, his breast had turned into saggy pillows of fat, and his arms and legs had swollen ever flabbier. He never had had much body hair before, but now he had started to grow a brown, fuzzy fur all over himself. Just like his hair it turned quickly grimy and matted from grease and sweat his overweight body produced. His feet started to slowly harden into hooves, and two small nubs of horns sprouted on his forehead. His cock tingled constantly, and when he checked himself from the mirror he could swear that it had gained an inch or two, and had started to grow a sheath around it. It was enough to keep horny all the time, and Coach encouraged him to masturbate as much as he could--it would be good for the hormone production.

He had not been allowed to shower during the entire time, because Coach insisted that it would dilute the effects. His unwashed smell turned rancid, as stale grease and sebum coated him and collected in the folds of his ample flesh, and his armpits and asscrack stayed moist and rank from his constant sweating. His other bathroom privileges were restricted too. The first time Coach insisted coming to watch over him while he used the toilet he blushed furiously at the idea, but the large bull did not budge. Eventually the urgent pressure building up in his guts made Jeremy acquiesce to Coach's demands, leading to him sitting flustered on the bowl right in front of the other man's belittling gaze. Inevitably the rich foods roiling in his colon made their presence known, and his ass spluttered and farted in a loud cacophony as he evacuated his bowels. Coach laughed at what terrible smell he made, and did not let him wipe afterwards for no other reason but to add to Jeremy's growing discomfort. The dirtiness of the whole affair did make him hard, however, and slowly he started looking forward to these little displays of filth.

He spent most of his days in his bed, alternating between stuffing his distended belly with fast food, the cheapest, greasiest slop Coach could find, and pleasuring his ever growing, permanently half turgid bull cock. Food he was too full to finish he smeared on himself, coating his new hairy body with mayo and ranch dressing, melted cheese and butter, whatever that was greasy and messy. It stank on him as it slowly turned rancid in the warmth of his stuffy bedroom, but he did not mind. He loved squirming in the sloppy mess and rubbing it between his legs, and stroking his cock with the messy remains of his latest dinner. He could feel the grease and salt itching on his skin, slowly seeping into his hide and staining him with its smell--and he quite liked it. His body was making all kinds of noises, his guts gurgling and burping from the food they were forced to constantly digest, erupting in bouts of flatulence. Ripe farts of foul gas teared from his rear end with alarming regularity, making his flabby ass cheeks wobble and his bedroom stink to high heavens, but he left it for fewer and fewer reasons. He preferred to stay shut in and stew in his own stink.

--

One day Coach came to his room and tossed a five gallon tub of lard in front of him.

“It's getting too expensive to feed you with people food, so we're going to put you on a diet of pure fat now. It suits someone like you better anyway."

Jeremy wanted to protest, because he liked the treats, but he could not stop himself eyeing the plastic bucket. He felt hungry again and only the thought of filling his belly seemed important in his mind. His face had elongated and had started to resemble a muzzle although his features were still mostly human, and he had sprouted a tail above his buttocks. It too had become soiled by the sweat and grease, and now flopped listlessly by his side. He tried to get up for a better view, but found it hard to move. His body had swollen into morbidly obese proportions, his gut a wide plateau weighing on his chest and making it hard to breath, his sides flabby and oozing over the bed's edges. His cock had been completely buried in the sweaty smelly pit between his thighs and massive pannus--but it only served to make masturbating easy because he could just let his erection slide out of its sheath and rub it his against the slippery flesh of his belly. As a result old, gooey cum that had grown rank after stewing for days under his fatty folds oozed slowly under it. Jeremy burped like an unclogged drain and shrugged, then started to fiddle open the bucket's lid with his stubby, slippery fingers.

The white lard glistened in the tub as he plunged his hands into it and shoveled great big scoops into his mouth. The fat melted on his tongue deliciously and he took another big bite of it, then started to stuff himself like a glutton. Fat dribbled between his lips and onto his chin as his mouth could not hold it all of it in, and he accidentally snorted some of it sending him into a coughing fit. As soon as he had cleared his sinuses of the greasy goop he returned to his meal, engorging himself on pure lard as if the was starving man instead of a grossly overweight beast.

On some distant level he realized what a revolting meal he had just scarfed down without hesitation, but he no longer cared. He wanted to eat because it brought him pleasure, and lulled him into a warm haze of full stomach, and he filled his mouth with anything as long as there was enough of it. The bull boy rolled to his side to make room for his full belly, and farted and burped contentedly.

“Hah, what a disgusting sack of fat you are!", Coach laughed and prodded his wobbling side with his finger. “We're almost there, though, but it still needs a little something… and I have just thing for you."

He took out a large plastic canister with something yellowish sloshing inside.

“This is old deep fryer grease from local burger joint. It's over two weeks old and had gotten too stale to use, even for a cheap place like them. They were about to throw it away so I got it for free." He smiled and patted the oily container. “We need to get this too in your body, but you look too full to drink it so we'll have to use... other means."

Jeremy did not understand and made questioning noises, but Coach simply rolled him on his belly despite his weak moans of displeasure. He had brought an enema bag with him, and started to pour the sickly yellow oil into it while Jeremy watched helplessly. The bag was filled to the brim with the sluggish fluid floating with burnt pieces of food, and without further ceremony Coach jammed a tube leading from it into Jeremy's squishy asshole. He could feel almost instantly the rancid cooking oil gushing into his rectum, filling it and flowing into his lower colon. He moaned and whimpered as a greasy feeling invaded his bowels, soaking them with liquid fat that had long since gone bad. He could imagine his guts ballooning out, and the grease starting to seep in through their inner lining, tainting his body with the stale, rank smell.

After a while Coach pulled the tube out.

“Hold it in. Hold it all in until it has been taken up by your hungry ass!"

Jeremy whimpered as he clenched his buttcheeks. There must have been at least a gallon of the oil inside him, and the pressure was ever growing as it roiled around in his guts. To his growing horror he felt a fart building up, and no matter how hard he tried to squeeze his anus shut a little squirt still managed to escape. It flowed over his taint and onto his low hanging pair of balls, shimmering on them as a hint of what was to come.

“I thought you loved to eat? Can't your useless ass do anything right, fatso?" Coach laughed and slapped his buttocks.

The jolt surprised Jeremy and he accidentally let his guard down, and the floodgates opened. A torrent of oil and loose diarrhea gushed out from his bowels, splattering on his ass cheeks and the bed. The greasy shit water pooled around him, smelling foul and soiling his already filthy body to an entirely new degree. He was mortified beyond belief, but he could not stop his ass sputtering out its contents on himself, the slippery liquid and loose stool resisting his feeble attempts to staunch the flow. Whenever he managed to squeeze his sphincter shut a rising fart would force it open, blasting out more foulness with wet, sputtering sound.

Coach was laughing so hard that it brought tears to his eyes, and he had to hold his nose when he spoke again to the furiously blushing young anthro.

“What a vile, stinky ass you have! Here, maybe I should show you what a real bull ass looks like…"

Coach dropped his pants and sauntered in front of Jeremy with the unhurried steps of someone planning mischief. He squatted enough to lower his ass on the level of Jeremy's face, showing off his muscular legs and firm, round buttocks. He lifted his thick tail to reveal his puffy, black anus, and based on the stench wafting to Jeremy's nose he had been using toilet just moments ago.

“Go on, take a closer look!"

Coach reached behind himself and grasped Jeremy's head with one hand, then pulled it hard to smoosh it against his cheeks. Jeremy gasped for air, but his mouth was filled only with the bitter, earthy stink of unwashed ass. He gagged but was smothered with the bull's stout rear end, and he had no choice but to draw in the ass scented musk into his lungs. His tongue touched Coach's pucker and was flooded with his raunchy, sickening taste. He sputtered and kissed it simultaneously, alternating between retching and then lapping more of the foul ass stink into his mouth. The tip of his red erection peeked out between his fat folds, and dribbled precum on his sweaty belly.

Without warning Coach farted, letting out a blast of ass gas right into Jeremy's open mouth. The pungent release made him choke and struggle for air, but Coach held him glued tightly against his smothering flesh. Jeremy's lungs burned as the shit-smelling stink lingered in them, staining him utterly from inside out. He started to lose consciousness… and came to laying on his back with Coach stroking his cock. The large bull was using the greasy filth Jeremy was wallowing in as lube, working it into his glistening shaft and down into his sheath, stuffing the leathery pouch with the foul products of his ass.

He felt delirious from the humiliation and the stench, but the Coach's rough hands on his manhood smearing him with his own, warm filth felt ever more arousing. He could not last long but came with a grunt, spurting his load on his soiled belly and chest. Even his cum had a greasy sheen to it, its consistency resembling more a frothy milkshake than normal semen. As his climax had built up he had felt a pressure on the sides of his head, and at the moment of his orgasm a pair of floppy bull ears suddenly popped out of his skull.

Jeremy laid on the bed, dazed and panting, then touched his new ears gingerly. “I… I think that's the last bit. Are we finished?" Despite the constant stream of embarrassments he had endured he felt immensely proud of himself. His transformation was complete!

Coach chuckled and wiped his hands clean on the bed sheets. “Nah, I don't think so. In fact, I think I'll keep fattening you up just for fun. I wonder if I can make you swell up into a one ton tub of lard?"

“B-but that wasn't the deal…" Jeremy's eyes widened in panic, and he felt a cold hand grasp the pit of his stomach.

“But you love it, don't you? You love being a useless sack of slob, admit it."

Jeremy shut up and tried to come up with an argument, but what whimpered out of his mouth was a pitiful yes.

Coach patted his cheek. “That's a good boy. Now, I'll have to get real creative at fattening you up…" He laughed with a cruel, sadistic glee glinting in his eyes.

--

Jeremy's room had turned into a cave filled with foul odors. The window had become coated with a yellowish film of grease and let in scant light. The floor was littered with heaps of discarded food wrappers and butter packages, left to moulder and stink up the place with sickly sweet stench of rot. In their middle laid an absolutely fetid mound of blubber, a swollen and obese beast vaguely reminiscent of a bull anthro--Jeremy. His hide was completely caked with grime and filth, of sweat and grease and remains of food that stuck to his massively bloated folds of fat and reeked like unwashed garbage bin. He was immobile, trapped under his own weight, his arms and legs poking uselessly under layers and layers of jiggling flesh. At first he had used bottles and buckets for disposing his bodily waste, but by now he simply relieved himself where he sat, coating his rear end with a squelching muck that stewed in his ass crack and between his thighs. The grease oozing from his skin clogged his pores and gave him a rash of pimples all over his body, red and itchy, and he scratched them where he could reach, popping them and inflaming the broken skin into pus weeping sores.

Even sitting made him short of breath, like someone was standing on his chest, and he could feel his heart struggle and spasm to keep his grotesque body alive. He wheezed and burped, made wet farts adding to the filth he was stewing in. His only reason to exist now was eating, stuffing whatever he could get in his hands into his maw. Feeling food go down his throat told him that everything was going to be fine, the pleasure of full stomach keeping him happy and content. Coach brought him garbage bags filled with rotting remains of foodstuffs that had been thrown away, salvaged from a dumpster behind a restaurant. Jeremy tore into them with gusto as if they were delicious treats, and slobbered over the rancid food that was no longer fit for human consumption. He poured the trash all over himself, swallowed as much as he could of the torrent of garbage and let the rest simmer around himself. He had not seen his cock in months, but could feel it twitch and splurt constantly, trapped within his rolls of fat, caked in yellow cock cheese and leaking oily, greasy precum.

Coach closed the bedroom door sat on the living room couch. He loved ruining young men, and his latest project had succeeded beyond his wildest expectations. Jeremy was so absolutely disgusting that he was beyond help--his mind was too far gone, turned into a docile eating machine--and no-one would ever look at him without feeling revolted and sick to the bottom of their stomach. Not even Coach wanted to stick his dick in him anymore, which was an achievement--he was a filth hound, always looking for the next depraved high to sate his perverse lusts, but Jeremy's utter repulsiveness had managed to turn him off. It made him very happy. Coach sighed and scrolled his phone, already looking for his next victim...