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It was his second day home sick from work, and it probably wouldn't be his last either. Yesterday, he had felt mildly queasy, but today everything hurt. He had managed to drag himself to the couch through the dull ache of his muscles, still clad in the t-shirt and boxers worn to bed the night before, which is where he had been lying all day. His skinny, 5' 11" frame easily fit on the couch, which allowed him to try and stretch out, had it not hurt too much. His eyes were focused on the tv mounted on the wall, which was turned off. It had been on previously, but he noticed his ears hurt no matter what volume it was on. It was hot, or he was hot. He could neither tell nor care. Sweat formed on his brow as his eyes moved around his apartment.

He lived there with his fiancé. That was why the coffee table next to him was littered with Better Homes and Gardens. They had always intended to move out of the city to a nice house. They never had the money for it, that was wasted on food and rent, and utilities. Even with their two jobs they barely scraped by. He worked in a research lab and she was a pharmaceutical sales rep for the same lab's parent company. She was off on a trip somewhere, selling some new wonder drug. She was supposed to be back today, and he contemplated calling her to tell her to stay in a hotel for her to not get whatever he had. The phone was on the kitchen table, however, and his cell phone was back charging in their bedroom. This made him think about whether or not it could be called a kitchen table, seeing as there was no "kitchen room," technically speaking.

His thoughts on semantics were interrupted by a spasm of pain. Apparently thinking hurts as well. Had he been paying attention, he might have realized where the pain was coming from. His brown hair had mostly begun to recede except for a fairly broad stripe in the middle. The strip began to darken and expand down his back before ending between his shoulder blades. The hair lengthened and continued to darken, turning a deep black. His new mane rubbed against his shirt, causing some discomfort. Managing to roll off of the couch into the space next to the coffee table, he removed the offending shirt and his hands rubbed up against both ears that had begun reforming. He paused briefly, shocked by what he felt before his whole body spasmed with a wave of pain. His ears had finished their reformation, becoming long and pointed, and had shifted to the top of his head. The brown hair left on the sides of his head began spreading down his neck and face. The hair paraded down his clean-shaven face, turning white between his temples and flowing down in-between his eyes. His nose collapsed in on itself, becoming flush with his face as the nostrils moved down slightly. His mouth began to push out, beginning to form an equine muzzle. His teeth shifted forward as his mouth expanded. Some split and began growing entirely new teeth as they broadened and grew. His muzzle reached its end, stretching out from his body. Dense hair continued down his face and out to his muzzle, leaving the top white with the sides and bottom the same brown as the rest of him. A patch of skin was left free of hair at the end of his muzzle, where his nostrils had broadened allowing him to take in more air than he ever thought possible. His nose tingled as he felt his skin change, transforming from pale, human skin to a thick hide of mottled black and pink. He took a deep breath and smelled everything. The carpet, the couch, the table, himself, his neighbors. A whole new world had opened up, and all of the smells frightened him.

Through this strong, primal fear he felt the hair continuing down his neck and chest, splitting paths and expanding out on his arms as his stomached back became coated. He could tell where it was headed next and struggled through his still present muscle pain and the trembling fear caused by his improved smell to remove the boxers while some patches of white fur appeared on his stomach. His wild pubic hair shortened and was assimilated into the ever-expanding brown and white wave heading down his body, as was his arm and leg hair. The shaft of his flaccid penis was coated soon after, as was his scrotum. The hair on his arms had moved slower than most, but now that the hair had reached his lower thigh and gone past his biceps, both had turned white and raced down their respective appendages, leaving his limbs sleeved in white. The hair above his wrists and ankles lengthened as they covered his hands and lower calf. The hair on his hands stopped at his fingertips, and on his legs the hair stopped at his ankles. His entire body had been covered in a silky coat of short, dense hair. He had been breathing rather heavily during the whole process and had just now realized it when he began to organize the smells. It was less frightening now, but he still shook, causing twinges of pain to shoot through his body from his aching muscles and the mane pressed against the floor.

His feet began tingling, as did the tips of his fingers. He looked down but couldn't see anything through the feathering around, and on, his hands and calves. He winced in pain as the nerves and blood vessels removed themselves from both areas. The skin on his fingertips turned black and hardened, putting blunt hooves at the end of each digit. His feet shrank, being drawn up into his body and reformed into broad black hooves. He lay on the ground, ears twitching, nose breathing in more air than he knew what to do with, wondering why any of this was happening to him. Yet again, his thoughts were interrupted as the skin on his body tingled, just like his nose had done. If he could see under the fur, he would have noticed his skin turning black and thickening all over his body. His nipples turned black as well and grew slightly. His areolae turned black and expanded in diameter, becoming the size of half dollars and causing the fur in its way to recede back into his body. There was a brief pause before his entire boy was wracked with pain. His bones split and shifted and grew. His legs became unguligrade, accommodating for his new hooves as his spine new grew vertebrae. His neck and back grew out and up as points of bone pushed skin outwards above his ass, forming his tail which was quickly covered in long black hair like his mane. Bones everywhere else in his body grew, pushing his thick hide outwards and stretching his muscles to their limit. His shoulders and ribs expanded, pushing up against the coffee table and couch. He could feel his vocal cords stretching and changing, allowing him to whinny and speak, expanding his communication options. His tongue expanded in his mouth, broadening to fill the space left by his muzzle, which was expanding again. His skull was expanding as well, leaving his brain floating in the protective fluid. He looked gaunt as this new round of transformations ended. Like a malnourished dog, ribs showing through his now loose hanging skin. He was breathing hard again. Heavy deep breaths, like a scared animal. He technically was a scared animal as well, a monstrous anthropomorphic horse, stretched taller by three feet weighing so much as to lack the necessary muscle to move.

This oversight in design was soon remedied, however, as he shook on the floor. New muscles were growing in and spasming, warming themselves up and building mass. Every muscle expanded, growing out his frame to massive proportions. It was like he had been working out in the fields by hand all his life, except more. Muscle rippled as he shook on the floor, each strand well defined through his thick hide. His lungs were expanding as well, filling up the new area left by his expanded ribcage. His diaphragm grew as it worked, contracting and relaxing as he hyperventilated due to the pain. His brain expanded into its new space, adding new sections for categorizing the new sensations from his nose and ears along with other important horse things. His stomach was being reworked and expanded, allowing him to take in more food and making him a permanent vegan. His intestines followed suit, reworking the digestive tract. His anus puckered out and widened to fit his new intestines, leaving a gaping entry before tightening back up again. His ass expanded, each cheek being filled with bountiful muscle and tightening into a bubble butt. He felt his mouth begin to spasm as his teeth clacked together, signaling the arrival of his new tongue and lip muscles. Suddenly, the expansion stopped. His massive frame was defined with well-worked muscle, grown over a matter of seconds. His left arm lay under the coffee table, brushing against the underside. It felt good on his hair, supplemented by new nerves from an expanded brain. Along with pleasure, he felt dizzy and short of breath. He was freezing, despite all of the new hair and insulation around his body. His heart pounded in his chest and he was scared again. Blood trickled through his veins, but it was no where near enough to fill him, supplying cells with much-needed oxygen and nutrients. His bone marrow switched into overdrive, pumping out new blood cells faster than ever before. His heart began to grow to accommodate the added blood, pressing out into a hole left by his lungs and filling the void in his chest.

He soon returned to a "normal" state. His heart returned to a resting rate and he breathed in, being able to put all of the air into his lungs this time. His mind automatically categorized the smells and whatever his ears were hearing, which was not much. His apartment was silent except for his breathing, and listening out at the rest of the building revealed complete silence. This wasn't entirely unusual, considering it was the middle of a workday, but still odd. He still didn't understand why this had happened to him, however. He thought it might have been the virus or whatever he had as he no longer felt ill. His muscles didn't even ache anymore. His new stomach grumbled, reminding him of its expanded capacity. He rolled over to get up, causing his left arm to lift and fling the coffee table across the room where it broke against the wall. He couldn't even feel himself lifting the table, which was probably a good fifty pounds, which he probably owed to his new physique. He managed to stand up, left hand gently bracing himself against the couch to prevent crushing it, and stood on his own hooves for the first time. He stood steady, balanced by the horse parts of his brain, and walked over to the fridge. It all felt natural and that scared him slightly, but it was also reassuring. He grabbed whatever he could from the fridge that his brain told him he could eat, and a jar of peanut butter from the counter next to it.

He walked back over to the couch and set the foodstuffs down, which also caused him to look down at his own body. His tail flicked and he frowned as best he could in thought. If he was to be a horse man, and he had to stay a horse man, then why couldn't he pack like a horse too? He held his average human-sized genitals in his hand. His balls looked like gravel compared to his massive palms. His other hand reached up and began rubbing his chest, circling around his nipples. He shuddered and whinnied, not from pain, thankfully, as bolts of electric pleasure were sent through his body. Damn, they were sensitive. And puffy. He removed the hand cradling his pitiful genitals and brought it to his other nipple. He whinnied again, but this time the shudder turned into a fall as he dropped to the ground. His ass absorbed the impact, causing shudders to be sent through his muscles as his massive arms rippled, delicately sending his hoof-tipped fingers in circles around the areolae. His cock hardened in an instant, filled with red hot blood. His loins burned in need, and he reached down to stroke himself. He used two fingers to gingerly stroke his cock, keeping one hand kneading his now aching pectoral. Under the hand on his chest, he could feel fat and nerves begin to build on top of the muscle, increasing his pleasure significantly. The fingers began to stroke faster as his chest began to grow out, expanding from pectorals into buds, then breasts. They kept expanding outward into pert breasts that look like an E compared to his body, but anywhere else would be absolutely ridiculous. His fingers were still going, flexing back and forth and shaking the feathering as his other hand kneaded the new bust. His cock spasmed and came, sending semen arcing a couple inches away from his body and landing on the floor with a small splat. He quickly brought that hand up to meet the other and play with his newly grown bust as something new was happening down below.

His balls duplicated themselves. One set stayed in his sack while the other pair drew themselves into his body. The testicles carved a channel through the horse, leaving nothing but a thin layer of skin between what was currently changing inside. The two testicles separated from their shared path, creating spaces for their new role as ovaries. They immediately began pumping out estrogen, causing new muscles to form around his closed-off tunnel. Outside of the tunnel, his cock and balls shrank slightly and shifted up his body as well. The skin over the tunnel opened, forming a thick, leathery, black horse vulva around hir new vagina. Shi continued to play with her breasts as the pleasure mounted. Hir vagina leaked fluid onto the floor, causing hir to slide as she writhed. With each squeeze and pull at the mounds of flesh on hir chest, the walls of hir vagina contracted, sending her spasming even more. New glands and ducts built themselves in the breasts as shi played. Shi pinched her nipples and pulled, causing them to grow out a little bit more until they were two inches long. Hir new glands went into full production, and as shi squeezed and pulled they pumped into hir ducts. Shi squeezed one lost time and sent hot milk flying through the air, as her vagina spasmed and shot hir fem cum all over hir thighs and floor. Shi lay there, panting, before bringing a breast to hir mouth and drinking. The milk was hot and rich and sweet. It excited hir, and she could feel even more natural lubricant being pushed out of the leathery opening. Musk filled the air, as did the smell of sex.

Despite all of this hir cock was still flaccid, and, having shrank, was even smaller than usual. As shi drank, however, hir shaft was being disconnected from the surrounding skin, free to slide out and grow. The newly disconnected skin joined with hir body, forming a sheath. Shi gasped as pressure built inside hir rectum. Hir Cowper's gland was expanding to match the former size of hir prostate, which was now the size of a peach. Hir balls expanded, filling the leathery scrotum before spilling down hir cum-soaked thighs. They expanded to the size of grapefruits and rebalanced the hormones in hir body. The sheath was first, expanding around the still human penis to accommodate for what was to come. The breast shi was suckling on ran dry, so shi quickly switched out for the other. Hir sheath came to a stop under hir belly button. Shi felt a small tug on hir cock and whinnied in between mouthfuls of hir milk. Hir penis expanded rapidly, fast enough that shi got lightheaded again, as the loose hanging sheath was quickly filled by cockmeat. Shi shuddered as the head flattened and flared out, leaving a small dome in the middle. The shaft expanded in diameter, out to a total of six inches. Shi felt a twinge of pain as a new muscle was added. Finally, the urethra widened, sending shots of pleasure down the middle of hir massive new shaft.

Shi ran out of milk from both teats, which now was giving hir stomach a slight bulge. Shi sat up and looked down at the new equipment. The head of hir cock stared back at hir, now mottled pink and black. Shi could feel hir vagina winking. Shi flexed the new muscle, causing hir mammoth penis to slide out of the sheath. It flopped over and rested on hir balls. Shi could feel them churning through the scrotum, pumping out horse cum and pushing what little human seed shi had left to the front of the line to remove it. Shi needed to remove it. Shi reached out and gingerly touched the heavy shaft causing it to jump and hir to neigh in surprise. Shi giggled slightly, which came out more like a high-pitched whine. Shi moved hir hand back in and began rubbing lightly. Hir feathering tickled the shaft as blood began to fill the monster, bringing it to its full, erect glory. In all, it was a rock-hard 40-inch cylinder of pure lust and desire, mottled pink and black with a thick ring right in the middle of the shaft. The head flared proudly as shi rubbed the sides. Hir urethra pumped precum up the shaft, adding to the already scorching heat generated by the massive length. Shi could feel the walls of hir pussy begin to clench in need. Bracing against whatever bare spots of floor shi could find, shi picked hirself up. Hir cock bobbed and leaked pre onto the floor like a faucet on low, a constant stream falling to the ground in pungent drops leaving a trail behind hir as she ventured forth into the bedroom.

Shi knew where hir fiancé kept her toys and knelt down on the floor, cock bobbing and spraying pre into hir face. Reaching under the bed, shi found what shi was looking for. A horse dildo, which shi dwarfed easily, but it would have to do. Shi also grabbed some vibrators from the bedside cabinet. Shi made hir way back out to the main room, cock still raging and hard despite not being touched since shi got up. Flopping to the ground, shi sat and stuck the horse dildo in her mouth, wrapping her tongue around it and placing it on the floor using a suction cup on the end. Shi wiped hir hand on the top of hir cock, taking the overflowing pre and rubbing the dildo down. Shi took the vibrators and turned them on, rolling them in the juices on the floor and carefully inserting them into hir ass. Hir hand pushed inside, easily opening hir pucker wide. Shi found rooted around for the spot, right on hir prostate, as she shot a jet of pre out across the room. Hir anal passage vibrated and pulsed, causing pre to leak even faster and hir dick to get even harder than before if that was possible. Shi carefully rose and positioned hir still winking lips over the dildo, dripping both types of hir natural lube all over the floor and dildo. Shi lowered hirself gently onto the dildo, one hand bracing for support and the other guiding the blunt tool to hir entrance. It had barely fit in hir fiancé, having used it before on her, but her lips opened easily, sucking the thing out of her hand and into place. Hir walls squeezed down on the silicone and shi dropped down, taking the whole length easily. Hir heavy balls hit the fluid-covered floor hard, sending jolts of pain and pleasure up hir spine. Shi whinnied. Shi had been doing a lot of that, and she loved it. Shi grabbed hir shaft with both hands and brought it in to hir chest, placing the length in between hir heaving breasts.

Shi took her hands off and locked hir pulsing member in-between the mounds, which have become warm and full with milk in the minutes since hir last milking. Shi squeezed them together, squirting her essence from hir teats onto the floor and dribbling down hir breasts and shaft, mixing with the pre soaking hir coat and cock. Shi brought them up, rubbing against the shaft as shi rose on the toy inside of hir. The dildo may not have filled hir completely, but it raked against hir walls and stimulated the bumps along the sides causing more spasms throughout hir body. Hir cock jerked between hir breasts, sending more pre flying. This time, it went straight up and hit the ceiling, slowly dripping back down. Shi put hir mouth over hir cock and brought hir head down, taking as much in as shi could. Pre squirted down hir throat as saliva filled hir mouth, frothing and snorting as shi bobbed up and down on both her own dick and the dildo. Hir tongue swirled around the shaft, coating it in a beautiful mix of pre and spit. Blunt finger hooves milked hir breasts, shooting streams of milk across the room and onto the wall. Hir balls slapped the floor every time she dropped down, splashing in the ever-growing puddle of sexual juices. Hir mane shook and flung with each bounce, and hir tail whipped hir ass. Shi came. Hir balls retracted slightly, sending what was left of hir human spunk through and into hir mouth. It wasn't much, but it tasted amazing, shi thought. Hir pussy walls contracted around the toy, hard. Shi sprayed more femcum onto the floor, a lot more than last time. Shi was producing faster and could go longer, it seemed. In fact, shi was ready to go again. Shi stood up, wanting to reposition hirself in a dryer area, and the suction cup popped off the floor, the shaft of the toy gripped tight inside her. The vibrators were still going strong and they made her unable to walk completely straight. Shi wobbled over to a dry area and faced the apartment door. The vibrators had kept her high going, and shi was going to ride it as long as shi can.

Shi lowered herself to the floor, placing hir ass on the wall and relaxing the muscles in hir pussy long enough to get the suction cup in place. Shi slid back, ass cheeks pressing against the cool wall, spreading enough that a trail of cum and lube were drawn on the white paint. Shi slid forward, dragging hir heavy, pulsing shaft along the floor, saturating the carpet with pre. The head caught on bumps and ridges, causing more whinnying. Hir breasts dragged across the carpet as shi pulled hirself forward, stimulation causing milk to leak from hir never empty breasts. Shi went back and forth, like a lust-driven piston, whinnying the whole time. Hir breathing increased, taking in the smells of hir sex and depravity. Hir tail flicked, smacking hir ass like a whip and occasionally dropping low enough to hit the outer rim of hir vulva. Hir long tongue lolled from hir mouth, dragging through the mixture on the floor, tasting what shi had become. Shi loved it. Every minute of it. Shi didn't know if shi was in heat or just very horny, all shi knew was shi had an itch shi needed to scratch. Hir hands moved back to hir ass, spreading it wide to get to hir hole. The vibrators had stopped. Shi continued pumping hirself on the dildo as shi reached in to remove them. They clattered to the floor as hir hand dragged them out before plunging back in, dragging hir fingers across the hot flesh. Shi found the peach-sized prostate and began to massage the lump. Hir face was being ground into the carpet as shi pumped with hir arm and hips. Her breathing deepened, hir nostrils flared. The horse part of hir brain noticed the smell of a horse in heat. Shi quickened hir pace and became more erratic. Shi let out the high pitch whinny of a horse in need, both needing and wanting to fuck. Hir balls swung pendulously, smacking the wall and leaving small sweat marks each time. Hir head was coated in pre and milk and had it not shi might've smelled hir fiancé walking down the hallway. The keys rattled at the door before a lock turned and the door clicked open. Shi let out a final whinny as shi slammed against the wall one last time as she came. Shi clenched every muscle shi had as shi came, balls drawing up close to hir body and sending liters of hot pungent horse semen through hir shaft at high pressure. The slightly chunky cum fired out and arced across the room, right into the open mouth of his fiancé who had just gotten through the first syllable of "Honey."