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It was another dreary day outside of the laboratory that Derek worked at as he got out of his car, signing as he closed his car door and began to walk inside. For the fourth time that week the slate gray clouds threatened to open on them but luckily, he managed to get inside the building before it happened. He said hello to the receptionist as he slid his card in than continued down towards his work station. As he made his way down the hallway the other researchers, most at least a decade older than him as they looked down upon him.

Derek attempted to avoid their looks for the most part as he made his way to the eugenics wing of the facility, which was where he was currently situated at. As a number cruncher he moved all around the lab sorting out and entering data of various experience but when it came to this wing it was both the most exciting and the most tedious. Looking at DNA sequences should be really interesting, he thought as he buzzed the door to be let in, but after a while everything begins to look the same as he heard the click of the door and was allowed inside.

He heard the screech of animals as he walked inside the laboratory that he had been assigned to for his data entry position. It was the first step towards getting a decent position in the lab, but it still didn't make it any less boring for him. As he looked at the stack of files that had built up next to his computer he wanted more than ever to be out there in the testing area with the other scientists doing the ground breaking research. While he had been told a number of times that he was just as intrical as they were he often didn't feel like it as he booted up his computer and started to put in the data.

"Well if it isn't my favorite data jockey," an enthusiastic voice said as Derek felt a hand on his shoulder. He looked up to see Dr. Memphis standing behind him with a grin on his face. The Ph. D. was the head of the eugenics wing of the facility and, unlike most of the other scientists, actually kind to the stable of processers like him. As they continued to talk he even gave Derek one of the coffees that he had brought everyone in the lab. Once they had finished talking Dr. Memphis told him the reason why he had come in the first place was that he was expanding Derek's responsibilities, a prospect that excited the young lab technician right up until he heard what that new task entailed.

About an hour later Derek had a suit and filtration mask on as he cleaned out the animal cages in the animal experimentation wing, sighing to himself as he did so. From what the doctor had said the lab technicians were going to take turns, and today just happened to be his day. As he made his way through the cages the animals hissed and tried to claw at him while he cleaned the empty ones. He was just glad that he only had to the empty ones at this time, especially the way some of the animals eyed him up while he passed by them.

Eventually he was done with everything and got out of there as quickly as possible to change out of the restrictive gear, feeling himself already sweating from the multiple layers. "Well look at what the cat dragged in," Francis, another technician that started around the same time he did, said with a chuckle. "Was wondering who they were going to be putting on poop duty after they fired that old fart. Couldn't have happened to a better technician."

"Keep laughing Francis," Derek muttered as he stripped down as quickly as he could. "They put us on a rotation."

There was a loud groan from the other male as Derek got the last piece of equipment off of his body and into the designated biohazard laundry. "I can't believe that!" Francis nearly shouted. "We're already doing all the grunt work and now they're putting us on crap detail? I really need to dust off my resume and get the hell out of here..."

"Oh shut it Francis," Derek shot back, rolling his eyes as he closed the door to the PPE storage area. "This is the best gig in town for our type of work and you know it. Stop threatening to quit every ten seconds."

"Yeah, best gig in town my ass," Francis grumbled. "Doing all the heavy lifting as far as these research projects go and then when it takes off these guys get all the credit and the money while I'm stuck making a little over minimum wage. Would it kill them to maybe at least give us a little something when they get a grant for hundreds of thousands of dollars?"

"Well from the last five suggestions you tried to put to the higher-ups about it I think they would rather keep all that money for scientific purposes," Derek said as he shook his head.

The other technician continued to complain but Derek ignored him for the most part, instead focused on washing up his hands and face. It had started to itch ever since he had started his shift inside the animal cages and now that the equipment was off it started to do so even more. He also began to feel hot and feverish... if he didn't know any better he would have thought that he caught something from the animals, but none of them had any pathogenic testing that would have been infectious. It made the remaining prospect rather favorable, that he was potentially allergic to the canines or felines in the testing area.

When he brought his findings do Dr. Memphis the doctor told him that it could be allergies, and to talk to him again if his condition gets worse. Derek nodded and went back to his work but as the day wore on he found himself unable to focus. The numbers he was supposed to be processing blurred to the point where all he saw were black blobs on a white background. The itching had also intensified and more than once he found himself rubbing his hands on his face to try and soothe it. When he felt himself break out into another cold sweat that was the last straw, and with Dr. Memphis's permission he was allowed to go home for the rest of the day.

By the time he managed to get back to his apartment his clothes were drenched again, though it seemed to keep him from itching as much. He called out to see if his roommates were there and when no one responded he stripped off his wet clothes and tossed them into his own room. The cool air felt refreshing on his skin, but not as much as he figured a shower would be. Dr. Memphis had recommended if it was some sort of allergic reaction to take one as soon as he got home to try and wash the dander off of his body. At that point it was all he could think about as he walked naked into his shower.

At this point it was the best feeling that he had ever experienced in his entire life, the warm water even better against his body than his own sweat had been. While he had never had allergies before he was fairly sure that something like this wasn't supposed to happen. He began to wonder if he was supposed to go to the hospital at this point but the shower had revitalized him and seemed to do the trick. Just to be sure he grabbed the shower gel and began to lather it all over his body just to make sure he got all the dander off his skin. As he rubbed his hands up and down his arms he stopped when it felt... strange, like the texture of his skin was off.

He quickly washed the lather from his arms and looked down carefully at his arms, which as he rubbed his fingertips on looked a bit like tiny hairs that had grown on his skin. Derek sloshed off the rest of the soap and saw that there was more growth on other areas of his body as well. "Were they testing hair growth genes or something in that lab?" he asked no one as he continued to investigate his body.

The longer that he had stayed there in the shower the more he grew less concerned about them. After all, he thought to himself as he continued to rub against the soft material, it wasn't uncommon for guys to get hair in strange places. It was like a joke or something like that as he continued to wash and soon he forgot all about the hair as he continued to examine himself for anything that might be out of place. Though he couldn't remember why he was looking at himself in the first place he knew that he was looking, so that's what he did.

It appeared that nothing else seemed out of place and the itching had passed so Derek decided to let it go and chalk it up to not feeling well. His rational mind continued to try and argue that he should go see someone or go back to the lab, but it was overwhelmed by the voice that told him that it would be way better to just lay on the couch. Part of him thought that he should eat but as soon as he began to think about the food in the apartment none of it felt all that appetizing for him. He decided he would eat later and lounged out on the couch instead, turning on the television as he laid there without a care that he was completely naked.

Eventually Derek passed out, and once he did his body began to writhe on the couch as it began to shift. Unbeknownst to him he was being altered on the cellular level, the virus that had been introduced into his system altering his genetic code cell by cell. When the viral load reached critical mass the changes began to become more apparent and the fine hairs that had poked their way out of his skin began to grow at a far faster pace. Soon his shoulders and shins were completely covered in soft tan fur that began to spread over his appendages as more changes began to be made...

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When Derek awoke once again he not only felt better, he felt great! He nearly leapt over the back of the couch he was so brimming with energy, to the point where he could a low rumble of contentment in his chest. He was almost giddy as he felt himself giggling. It was almost as if he was purring, and it made him feel so good that he continued to do it. When he went to press his hands against his chest in order to feel the vibrations when he noticed that his hands seemed... fuzzier than normal. He looked in awe as he petted the soft pelt on the back of his hands, and found it was all the way up to his forearms and around his biceps which had swollen as well.

He was just about to go to the bathroom to try and see what else happened to him when his eyes spied the refrigerator and he heard his stomach rumble. The hunger was so overwhelming that he forgot everything else that was happening to him. The fridge door was almost ripped open as Derek rummaged through it, but despite his hunger nothing seemed to appeal to him. All that was even close was a jug of milk, but even that he only took a few sips of before he growled and dumped it in the sink.

Just as he was about to move towards the cabinet when a sudden noise caused him to spin around. It was the sound of the key being turned into the lock, one of his two other roommates was about to enter the door. When he thought of them it was like a switch in his mind flipped, his tongue sliding across his slightly sharper teeth. It was like he had been struck by divine inspiration and he suddenly knew what he want, the only question that crossed his mind as he ducked down behind the kitchen counter was which roommate was about to enter. If it was Allen he was about to have a hard time, but if it was Trevor...

Trevor sighed as he opened the door, exhausted from the day of classes and then work right after. All he wanted to do was to sit on the couch and veg out for the rest of the night, tossing his coat in the room before heading back to the shared common room. The television was still on, which was strange since no one else should have been home at this point. When he sat down on the couch he also felt a strange dampness in the couch itself like someone had laid wet clothes on top of the cushions. He began to feel it soak into his clothes and he started to get up before he felt a pair of hands on his shoulders.

"You seem tense," Trevor heard above him in Derek's voice. "You really should relax."

"I didn't realize that you were here Derek," Trevor replied as he squirmed slightly under his roommate's grasp, the impromptu shoulder rub something that had never happened before. "Uh... I didn't know that you were home..."

"I got a half day," Derek replied, Trevor hearing a strange rumble that seemed to vibrate behind his head. "You know I haven't seen Mikey anywhere in a while, you two split up or something?"

Trevor's face twisted in confusion; neither of his roommates had ever inquired about his love life, or lack thereof, and since they had both made it clear that they preferred women it didn't really matter as long it didn't intrude on them. Now he had one of them with their hands on his shoulders rubbing them while asking about an ex-boyfriend? He had enough of the strange act and broke the hold on his shoulders in order to see Derek eye to eye, only to let out a yelp of surprise and fall off the couch and onto the floor.

The man that stood before him was not his roommate, at least not at first glance. The naked male that stood before him appeared to have swatches of tawny fur beneath it, save for around his neck where he had grown thick black fur that had merged with the wild mop of hair on top of his head. The most striking features though were not the hair on the human's body but also the physique, his roommate's normally lanky body had grown to something lither in shape as he slowly walked towards him. His hands and feet were also very swollen as he approached, as was his face as several strands of black hair fell across it while he stared with a hungry gleam.

"I want you..." Derek said, his tongue licking his teeth that had grown slightly more pointed as he got down on all fours and began to crawl towards the prone man. "I need you... I need to be inside you. Let me fuck you Trevor... right here and now..."

As Trevor continued to back away he could see the erect cock between the naked male's legs, already dripping with pre as it throbbed. The flesh of it looked redder than usual, but before he could do anything Derek pounced upon him and pressed his puffed out lips against him. Trevor didn't know what to do, while part of him wondered what game his roommate was playing the touch of another male against him was sorely missed and the lips and tongue that pressed against his were passionate and needy. The lust that the other male had was contagious and the trepidation that it was his what he thought was his straight roommate grew smaller with each passing second.

Finally Trevor's mind gave in and decided to go with it, his hand reaching up and pressing against the back of Derek's head as they began to make out. When his hand pressed against it he couldn't see it like hair anymore, in fact if anything it had a texture and softness to it like when he used to have a number of dogs at his home. The feeling caused him to continue to stroke down it while the two continued to press their lips against one another. As they did the tent in Trevor's pants continued to grow, especially when he felt a hand begin to reach inside and stroke against it until with one forceful move it popped the button and ripped the underwear beneath it in one smooth stroke.

"Hey!" Trevor suddenly said as he backed away and looked down at the damage. "Those were my favorite pants dude!"

"They're in the way," Derek replied with a low growl, an almost feral tone that caused the other male to swallow hard. "Now on your knees with your stomach against the couch." Trevor quickly did what he was told, between the sharp nails and the puffy face his roommate possessed he almost looked animalistic in nature as he immediately felt the weight of the other male once he had done what he was told.

The need for Derek was almost at a fevered pace now as he could feel his body begin to sweat again, matting down the patches of fur that had grown on his body as he took his own erect cock with one hand while the other pulled down the ruined pants of the other man. At this point he was running purely on instinct, he didn't know why but he had to have sex with his friend, to penetrate him with his dick as he began to rub the tip between the other male's cheeks. In the back of his mind a small voice screamed that this was wrong but it was overwhelmed with the roaring want that spurred him to go further. As he gave his already hard cock a few strokes he suddenly felt something thick and sticky on his hand and he realized that he had somehow gotten pre all over his glistening rod, which was just perfect for him as he began to slide the tip of it into Trevor's hole.

As soon as he felt the ring of muscle begin to stretch open Trevor's hands gripped the couch. It wasn't just the penetration that was causing his muscles to tense up, something else was happening as the pre-slickened rod began to push inside him. While he had his fair share of things in his rear this was by far one of the strangest sensations he had gotten, like whatever goo was helping Derek slide into him was simultaneously relaxing his muscles for easier penetration and causing a warming sensation that began to spread out from his spread open walls to the rest of his body. He started to turn his head back to ask Derek if he was using some sort of new lube before a growl and a sudden thrust deep into him caused him to go nearly cross-eyed from the sheer pleasure.

For Derek their mating was nothing but a fast and furious pounding into the other male for his first gay experience. His pupils were fully dilated and a strand of drool dripped from his lips as he bucked his hips forward faster and harder as he felt the pleasure build up in his body. It wasn't long since their coupling began that he felt the familiar sensation of his climax approach, except this time it was tinged with something else that he hadn't felt before. Instead of his usual move of pulling out and stroking the last few off his last thrust went all the way to the root as deep as he could go into the other male while his hands clenched around the hips to the inner thigh of the other male while he blasted his cum deep inside.

Trevor used the couch cushions to muffle his own screams as his roommate came inside him, his fingers scratching against the couch as he felt what seemed like a gallon of it fill his insides. As he was being stuffed to the brim he felt a hand grab his own throbbing tool and at first he thought it was going to be Derek jerking him off, but instead he gripped down by the root and held a firm pressure there. He gasped when he realized that he was being prevented from orgasming as the last of Derek's climax settled before he quickly pulled out. As soon as it left his body Trevor felt his hole contract, trapping the fluid inside him as he was roughly turned over before he could ask what was going on.

Once he had seeded his roommate a switch flipped inside Derek and aside from the insane amount of pleasure he felt from the act itself there also seemed to be an additional lustful feeling he got. It was something he never experienced before even when he was with a woman, and though part of him wondered if it was because he indulged in sex with another male that didn't feel right either. No matter what though it didn't stop him from going for what he wanted next, which was contained inside the cock he had wrapped his hand around. Trevor hardly had time to adjust himself before his mouth was on that member, tasting his own pre and the flavor of the other male as he bobbed his head up and down. With the stimulation he had already gotten it didn't take long before the passionate blowjob was met with its own reward of the hot spunk splashing in his mouth that he eagerly gulped down.

As soon as Trevor had orgasmed into him Derek almost immediately felt those rabid instincts cool, the intense hunger and lust that had driven him for the past few minutes dying away as his naked body fell backwards onto the floor. It was as if a fog had cleared away from his mind as he looked at his roommate, who sat there panting with his torn pants around his knees and the taste of his cum still in Derek's mouth. Then he looked down at himself and realized with a shock that he was still naked, leaping up from his spot and running to his bedroom with the other male looking at him confused. At first he thought about immediately going into the shower to try and wash himself clean of what he just did, but now with his head cleared he realized that something very wrong was happening to him.

Derek heard his impromptu partner ask him if everything was alright and he found himself without an answer. He needed to figure out what was going on... and though it was getting late he felt like the lab was the best place to go. Though he felt a piece of himself lament having to do it he managed to get himself dressed and ready to go outside. As he ran out of the bedroom and towards the front door he heard Trevor calling out to him but ignored it. He could apologize later, he reasoned, for now he had to figure out what was going on with his head and why he had just done such a thing.

Meanwhile Trevor just shook his head as he sat there, slowly picking himself up after he heard his roommate rush out of their apartment like a bat out of hell. Was it embarrassment at how he acted, he wondered as he sighed while playing with the ruined front of his jeans, or perhaps with the strange way he looked? Now that he had properly cooled down he had wanted to ask why he looked so strange, like if he was supposed to be heading for some play or production or something like that. It had to be a prop or something, he reasoned, since people can't grow hair that fast and certainly not like what he felt. With no answers in sight for him however he decided to just take a shower and go about his day like normal until Derek got back so they could talk about it, scratching his groin and butt as he made his way to the bathroom...

************************************************************

A few hours later night had fallen over the city as Derek tried to open the doors to the lab, only to find them completely locked and with it his chance of seeing if something in there caused his current condition. The entire time he was traveling to his destination he felt hot but not sick, in fact ever since his tryst with his roommate he felt better than ever. It no longer crossed his mind that this was allergies or some type of bug he picked up, this was something he had to have gotten at the lab while he was cleaning the cages. The only thing that really bugged him was that there was no pathogen testing going on the lab that could cause him to get sick... was there?

As he made his way back through the park to the subway station a sudden jolt in his back nearly caused him to fall over on the park path. By this point in the night most people have either turned in or were at other things so the area was largely empty, which was good for him as he had to stop and catch his breath. The heat in his body began to grow more intense as he let out a low groan while another surge of energy rushed through him. He stumbled his way off the path and out of sight, feeling his fingers dig into the clothes he wore as he everything suddenly became off balance. His vision became blurry and his spine ached as he eventually made his way down to the edge of a small man-made pond that was fairly out of the way.

His grunts grew lower in pitch as he remained on his knees doubled over as his back continued to twitch, feeling something throb against the base of his collar bone. At the same time one hand went up to his face as it began to stretch like taffy, his jaws feeling like they were being pulled out while his ears pushed their way to the top of his head. As his hand continued to hold his transforming face that grew bigger as well and the tips of his fingers as well as his palm seemed to grow thick and leathery as his entire body convulsed and swelled underneath his clothes.

When the powerful wave of changes finished Derek was left there panting, breathing heavily as everything slowly returned to normal. Well... almost normal, he could already feel a strength in his body he had never had before as he held out his trembling hands and found them covered with golden fur complete with paw pads. He was just about to sit down in sheer terror and exhaustion when he let out a yelp and fell forward, feeling something swish in the air behind him. He looked back in the reflection of the water to find a tufted feline tail wagging behind him, unknowingly connected to his body until this moment.

"No..." he said, his deeper voice resonating as his hands felt the bulge of furred flesh and muscle that was his face. "This... this can't be happening..." he looked down in the water to see that his hair was now positively wild and grew like a mane down his face and shoulders, which gave definitely gave him a leonine appearance along with what looked like the start of a feline muzzle. While it still was only a few inches out from his face it was definitely noticeable now, along with the sharpened teeth he saw when he took a hand and pushed up his thick lip.

Suddenly a noise caused his ears to twitch and he quickly put the hood up over his head, hoping that whoever was there hadn't seen his altered state as his sensitive hearing picked up the sound of footsteps heading towards him. "Well look at what we have here," a voice said in the darkness. "Someone fixing to take a swim? You should let us hold your belongings before you do that so they can stay... safe."

Muggers... it was the last thing that Derek needed at the moment and he could hear there were two men now about twenty feet behind him and approaching close. "Look at the tail on this guy," the other one chuckled. "Must be going to one of those freak joints they have further down the strip. You make this easy on us and we'll make sure you have enough to pay the cover so someone can pound your ass the way you like it."

The two continued to laugh and Derek could feel his blood begin to boil at them. With his newly enhanced sight he could actually see them in the reflection of the water, watching them continue to approach while they jeered him. He could also see that while they were both armed it was with melee weapons that were easy to take care of as those new instincts rose to the surface in a completely different way. Despite wanting to keep the two cocky he couldn't help but let out a deep, throaty growl that caused the two to stop a few feet away from him.

"Well looks like he wants to get the shit kicked out of him the hard way," the first mugger said as he readied his strike by raising the pipe he had in the air. "Good thing the lake is right here so I can wash your blood off my shoes when-"

The man never had a chance to finish that sentence as Derek whipped his head around like lightning and bit the mugger in the arm, causing him to scream out as he dropped the pipe. As soon as his teeth finished rending flesh he realized the first mugger and turned to the second who had attempted to come up behind him with a baseball bat to knock him out. Derek took one arm and grabbed the bat mid-swing, crumpling the metal before his other hand knocked the guy so hard in the chest he could hear the ribs crack before he fell to the ground himself. His long tongue licked the blood from his teeth as he watched the two attempted assailants writhe on the ground before he came to his senses and he bolted through the forest with incredible speed.

What had he just done, Derek thought to himself once he had put enough distance between him and his would-be attackers. He was like an animal, and though he was thankful he didn't get beaten by the two his response worried him. Whatever was happening to him was messing with his mind, he resolved as he started to walk quickly through the park towards the subway station. Right now his only thought was getting back to his apartment and waiting in bed until the lab opened the next morning, hiding his new features as best he could while he made his way to the train...