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Lars grumpily sat on the sofa, an ice pack on his head to try and bring off some of the heat from the fever that he had. The man was waiting for Jack to come back, as he was off to get medicine. But the heat was getting unbearable, and the thermometer was topping at one-hundred and one degrees. But, finally, the other male came in through the door, holding on a white bag with the medicine.

“Finally.” Lars said, groggily getting to his feet.

“Here.” Jack said, “Change is in the bag too.”

Lars didn’t really pay that much mind, and instead tore into the bag and saw the small bottle of medicine. He didn’t bother to look over the instructions or directions, and instead just poured out the contents of it into his mouth, guzzling it in a few gulps.

“Jeez Lars, I don’t think you’re supposed to take it like that! It’s not healthy! Read the dosage!” Jack said, looking on in shock.

“Don’t care, I feel that miserable.” Lars replied, shaking out the last drops of medicine onto his tongue.

Lars tossed the bottle and the bag to the side and then flopped back down on the couch, waiting for it to start having any sort of effect. But he soon doubled over, gasping out, and grabbed at his gut.

“See, I told you to read the dosage!” Jack scolded, and went to the bag to see if this was some sort of side effect to taking the medicine improperly.

With his back turned, Jack didn’t see that Lars was grabbing and tearing at his clothing. He looked over it, but didn’t see that there were any sort of side effects from taking this. He must have just gotten a cramp of some sort by ingesting so much, so quickly.

“Looks like…” Jack said, turning around, but then going silent as he saw that his sick roommate was naked and clawing at himself. But there was more to it then that. His body was shifting, convulsing, and changing. Fine hair was sprouting on his body, a deep and chocolate brown at his lower half.

Lars was arching his back as he felt his body crack and shift. He gave out a ghastly gasp of air as his spine started to elongate, the flesh, bone, and muscle growing with it. The toes on his feet started to fuse together, becoming one large mass that was getting more calloused. Lars pushed himself forward, just as his lower half pushed back, and soon a second set of legs sprouted from his hips and front. The shifting lower half of the male was taking his legs with it. As the brown hair was getting thicker, it looked like Lars’s lower body was becoming like that of a horse. The toes he had fused into solid hooves, and then even a fine brush of a tail sprouted form his back.

But the changes weren’t done yet. Lars’s body began to expand and grow, thick muscles filling his normally spry top half. The lanky and sickly male was getting beefier and larger, and eventually looked to have the physique of a bodybuilder atop his horse body. His groaning out and cries of pain soon turned into moans of pleasure and lust as he held onto his form. Abs, biceps, and a firm back were on his human half, and his horse body was getting thicker and larger as well.

The long, hooved legs were getting larger and stronger. His backside, including the horse backside, were getting broad enough to ride, and his mass kept increasing. Finally, the finishing touch was a massivily hung horsecock sprouting from behind him. Thick, powerful, covered in veins, and so large that it pushed out between his front legs.

Jack took a step back as he saw his roommate suddenly turn into a centaur right in front of him. He tried to back away, but Lars soon had his eyes on him. The male tried to run, but soon the muscular centaur was upon him. The weight of his body crashed into the smaller male, knocking him over, and soon the huge, hung, horsecock was in his face.

“What are you..ooomphhhh!” Jack gasped out, before the flared tip and head of Lars’s new cock was shoved into his mouth. There was at least seven feet of dick sprouted from the centaur’s groin, and he could only get a third of it into his roommate before he felt too much resistance. But, that would be enough.

“MmmgghhhmmmmmMMMMMM!” Jack muffled out as the centaur Lars started thrusting into his throat. The bulge of the horsecock shoved in deep, stretching his throat muscles as he forced him to suck him off. The upper body on Lars continued to bulk out, expanding in muscle as he humped into Jack. His brown, furry balls began to slosh and churn, gurgling up a storm before they began to gush.

Jack could see the bulge of cum coming down the tunnel. He gripped at the horse cock, trying to block it, but the force was too strong for him to stop. Seconds later, a gallon of centaur cum was flowing into his stomach. He hated to admit, but he loved the taste of it once he felt some on his tongue, and his eyes started to get slightly hazy.

Jack’s body was starting to change almost as soon as the cum entered his system. His body began to shake and expand, the growing size and mass of it making his clothing shread as he drank from the hose-like horsecock. A thick forest of black hair began to form upon his lower body, and he felt his toes merge into hooves. He looked up at the underside of Lars’s centaur body, realizing that he was being changed by his cum. He couldn’t find it in himself to resist, and started guzzling more, wanting every drop that the centaur’s balls could give.

Jack’s body began pushing back, his feet and legs becoming much stronger as they became more horse-like. His own muscle mass began building and growing as well. After several minutes, he pulled the horsecock out of his mouth, no longer needing it as a catalyst to fuel his own change. He grunted out and moaned freely, feeling his body expand and bulk outward. His arms became as large as his old torso as he began to flex and pose. Then, he pushed forward, feeling his back half hit the wall as the rest of his taur body formed.

Gingerly, Jack got back to his feet and tensed himself, feeling more bones pop and muscles expand as he grew larger and more muscular. Much to his surprise, he was getting bigger than Lars was, and he was looking down on the other centaur. A sudden slap hit his stomach, and he felt his own nine foot horsecock slap at his belly, just as he grew wider and taller, soon straddling over the other centaur.

It was hard to move, as his muscular body was so expansive that he could barely get one hoof in front of the other, but he did have enough wherewithal to know that he didn’t want to be this size alone. With a powerful thrust, Jack humped forward, shoving his hyper dick into the other centaur’s mouth. His massive cock slid down the human half and into the horse, pushing right into his stomach. Jack’s own gut hung low, keeping Lars pinned as he humped away, working to pump his own cum into the other centaur.

The first male to change opened wide, taking the flared cockhead all the way down to the medial ring. Lars soon stretched his jaw further, feeling his pecs and chest bulge out with the shape of the cock he was swallowing, and still wanted more. He pushed forward, taking four feet of dick into himself, and could feel the pounding of the larger man's heart through his dick. He continued to suck, his tongue working over that shaft, and he reached forward to cup the black-haired balls, making Jack’s own brushy tail swish, knocking over other furniture with the force behind it.

Within a few minutes, the huge horseballs began to slosh loudly, and then Lars braced his taur body for the flood to come. A torrent of taur cum gushed out, flowing into his chest and filling his stomach. The larger centaur grunted and humped, working to get more seed to fill the other male’s body. And like before, the addition of centaur cum was getting their bodies to grow. Their muscles expanded out, bulking out larger and wider until they were both filling out the living room completely!

Their legs strained under the weight of their bodies, the excess weight and muscle mass bringing them to near immobility. But still, they kept growing. The size and weight and power continued to grow as their bodies did, until Lars pulled the cock out of his mouth and let Jack blast freely to the ground. Their taur bodies were intertwined and stuck together, until they grew to the point that the walls collapsed around them, giving them more room for their muscles to grow.

Soon, Lars’s own cock erupted again, his hyper shaft splattering his centaur cum to the floor as well, and puddles of seed flooded around their hooves, splashing about as their muscular bodies fought for space. The entire ground floor was soon coated in a rising tide of sperm and seed, the two centaurs still blasting out their transformative cream. They would be locked in this position for several more hours, as their bulk was overwhelm even the strength of their horse bodies. But, they would continue to bulk and expand, and they seemed to show no sign of stopping!