Matt was already having trouble keeping his head clear, especially with Tom having literally turned into a cow right in front of his eyes. He tried to cover his eyes and block his nose, and that seemed to work somewhat. However, he didn't block his ears, and the moment Kate said "Bull might be helpful", an image of a powerful, fat, and virile bull popped into his head. And he suddenly gasped and grabbed his churning stomach.
"Oops. Did I accidentally trigger your change? My mistake." Kate said, though she certainly didn't sound sorry at all, and just figured she'd have fun with Tom and Matt's problems.
"Oh... god! N-no, no, please no!" Matt whimpered, clutching his stomach with one hand, and lowering his other down to his crotch, which felt similar to what Tom felt like earlier. Looking down, he saw his stomach begin to swell up, growing heavier and rounder as it grew past the end of his shirt, extending and getting chubbier. Matt used to hands to grab it as it swelled like a balloon, hefting it up and feeling its weight. In fact, it felt like he was gaining weight all over, his clothes straining and beginning to tear.
But then there was a dull pain in his crotch, and Matt looked past his inflating stomach to see a large bulge in his groin. It felt like how Tom did, with cream filling his balls, making them expand and gurgle. But unlike Tom, this cream in his balls was hardly milk.
Matt struggled to get his pants off his much wider thighs. Eventually, the fat he was gaining seemed to help him out, causing the button on his tight pants to ping off and the zipper to come down by itself, letting the shreds of his pants fall on their own. Between his legs he saw his balls, much bigger than he remembered. They were heavy and now were covered in a thick, leathery sack, bull sperm causing them to grow even more.
"Wow, look at you, stud!" Kate said, looking down at Matt's much larger scrotum, "You'll make sure Tom here will have babies for sure!" Tom the cow was also watching Matt's transformation with arousal. It was at that moment that Matt's cock, erect and throbbing, began to grow longer, harder, and thicker, with precum dripping down the shaft, elongating so far that Matt couldn't breathe, for he was blown away with how massive it was!
"M-my cock..." Matt stammered, seeing a sheath cover it. "S-so... big... and sensitive" He tried to reach and rub it, but his hands began to turn into hooves, his fingers fusing together. "Damn it, no!" he moaned, getting onto his hands and knees, his feet following his hands.
"Don't worry, Matt. You'll have plenty of time to work off that horniness with Tom here, once you're done changing and all." Kate said, leaning against the wall and texting her uncle that there would now be two bovines to pick up.
"Tom..." Matt moaned, glancing at the cow and suddenly smelling a very nice scent coming from Tom's rear. "Ohh... smells nice..." he groaned, his dick still throbbing. His body's proportions began to change, more fitting a bull than a human.
That's when there was a groaning in his abdomen. "Oh no, not that too!" Matt exclaimed, unable to stop himself as he dropped a cow pie of his own, amplifying the stench in the room even more. Kate nearly gagged and stuck her head out the dorm door for a moment to catch some fresh air.
Matt felt a slight pain in his head as two horns grew out of his forehead, his neck growing longer as his mind began to grow fuzzy, hormones slowly overriding his sanity and making him want to fuck the nearby cow.
Kate reentered the room, plugging her nose. "Wow, what did you guys eat at the dining hall that smells this bad?" she asked, fanning the air around her. "Oh, you look like you're almost done there, Matt! What will you do now? Will you go ahead and mount Tom?" She gave a little smirk.
Matt groaned as fur grew all over his body, his face starting to push out into a fat bull muzzle. "I'm... I'mmmmoo... turning... intooooo... a..." he tried to say, but his muzzle was already growing in. He looked at Tom's sex, and he oh so wanted to breed her. "So... hooorny...."
"What are you waiting for, Matt? Go on! Do what a bull is meant to do!" Kate urged Matt.