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It was late in the night in the small mountain town, the only lights were those of the main street as those in their houses were already in bed. For some the darkness that surrounded the town was a comfort, especially those who went out for hunting, fishing, and camping during the night. For one such wolf it was merely sitting at the cabin that he owned in the woods and sipping his drink while watching the stars moving in the night sky. With no light pollution it was one of the lupine's favorite things to do, though there was a chill in the air that eventually caused him to move inside. Though he didn't need to do so he locked the door behind him as he put the empty coffee cup to the side and began to prepare himself to turn in for the night.

As he put his final preparations in the wolf still felt a chill in the air and as he looked around he noticed that one of the windows was opened slightly. "That's strange..." he said to himself as he went over, examining it closely before closing. "Come on Derrick, don't start getting paranoid on being in an empty cabin because your boyfriend decided to ditch you."

With nothing else that seemed to be out of place the wolf decided that it was just something that he had forgotten before heading to bed for the night. Even though the bed was comfy enough and the cabin was cozy this wasn't quite his thing, that honor belonging to his better half that flaked out on him at the last second. Part of him wished that he would just go back to the city and end this whole thing but the deposit wasn't going to be refunded and he had already taken the time off. That left him laying in a bed alone listening to the last crackling logs of the fireplace before attempting to drift off to sleep.

But what Derrick didn't realize was that he actually wasn't alone, and as he slept in his boxers he tossed and turned just inches away from the creature that had snuck into his cabin. Had he seen it he would have thought that someone left a dark green, shiny tube sock or, for the lewder minds, condom on his bed. As his body heat warmed the sheets it prompted the creature to act, slithering forward like a snake as it looked for its goal. While the wolf played on his phone while lying on his side he was too distracted to notice that the hollow creature had found it's target, the creature's tail.

The lubricated inner body of the strange alien allowed it to glide across the fur as hundreds of tiny cilia kept it from being rubbed the wrong way and alerting its new host. Over many eons this alien creature knew how to adapt to a variety of hosts in order to infest a creature without being detected, and as Derrick remined blissfully ignorant of what was happening behind him the parasite got itself into position. As it crawled up his body it took stock of what it was dealing with and realized that it was... inadequate for what it was planning to do, but as it continued to sample the DNA of the creature it had already begun to synthetize a cocktail of mutagenic alien cells that were ready to be inserted into this host in order to alter him to suit the parasite's needs...

The first indicator that something was wrong was when Derrick suddenly felt something tighten against his tail, causing him to drop his phone in shock and spin around to see what had just attacked him. When he threw off the covers to try and see what bug or animal was in the bed he found nothing, causing him to be confused before once again he was reminded of the pressure that he felt on his tail. He tried to twist himself around to see what was going on but couldn't see anything, then grabbed onto it only to find flesh instead of fur that caused his heart to skip a beat. When he put both hands against the tubular appendage he thought at first something had managed to take his fur off... until it pulsated against his palms and caused him to freeze.

"Ow!" the wolf shouted as he felt something pinch the flesh of his palms, pulling back and looking at them as he attempted to roll out of his bed. Whatever was on his tail had stung him or something and had caused the skin to swell, though at the moment he had different things that concerned him as he began to feel something pressing between the furry globes of his butt. The parasite had completely taken control of the limb it had latched onto and with the creature confused on what was happening to him it was the perfect time to prepare the host for the primary purpose of the parasite... to spread. As a tentacle grew from the head of the alien creature it easily pushed past the ring of muscle in order both stimulate the male as a distraction and to deliver the mutagen that it had prepared.

Derrick let out a loud groan as he felt something pushing into him, causing him to moan out in pleasure despite himself as his libido suddenly spiked. Even though something was happening to him his boxers began to tent as his insides were spread apart and his anal walls were stimulated. His panicked breaths turned to pants as it admittedly even felt better then when his boyfriend had sex with him, feeling his cock throb as his distracted mind forgot what he had been freaking out about in the first place. The intense waves of lust coming from his rear was also distracting him from the tendrils of alien flesh that had also pushed their way into the skin above his tailhole and had started to wrap around his spinal cord.

Suddenly the wolf felt weak in the knees and his desire became almost insatiable, falling back onto the bed as he continued to groan. The temperature in the cabin had gone from chilly to a sauna and he found himself taking off his shirt and boxers. As the did so he let out a gasp when he saw his completely erect cock; unlike the normal pink flesh his member had started to darken to an almost black color and looked far more veiny, throbbing hard as the chemicals being pumped into his tailhole turned his breeding tool into one that would enable the spreading of the alien parasite. His balls churned as his seed was corrupted to do the same, though at the moment all Derrick could concentrate on was how thick he was getting as his fingers closed around the shaft.

The second his fingers made contact with the sensitive flesh it was like the lupine had been plugged into an electrical current, causing him to start to stroke it despite himself as the parasite continued to infest his new host. His normally fluffy tail had been completely overgrown by the sleeve of organic tissue and had lengthened into something more muscular and tubular in nature. The added length was completely hollowed and had several smaller tentacles that stretched out into the air as the back of the wolf bulged. The combination of the stimulation and not having had any release for the last few days had made it easy for the parasite to keep the wolf distracted in his lusts, although Derrick's eyes snapped open when he felt something other than his fingers wrap around his shaft.

"What the..." he said before his eyes widened, watching as two black tentacles had pushed their way out of his palms and had coiled around his cock. "What the hell!?" With the fog of pleasure temporarily overcome he saw his fingers had grown webbing around them as well, making them look like they belonged to an amphibian as he also became aware of something sliding around the middle of his back. When he attempted to pull his hands away to go and grab his phone he found himself unable to do so, as well as when he attempted to stand up.

Derrick started to panic and the parasite could sense that, prodding against his prostrate to send a tidal wave of pleasure into his brain while the alien tendrils began to bulge out the fur in the middle of his shoulder blades. "Uggh... no..." the wolf tried to resist, although even as the words came out of his mouth he could feel whatever was thrusting into his tailhole pushing up the back of his neck. "You... can't... I... ahhhhhh!"

The wolf let out a shout and his muzzle pointed up towards the ceiling as his brain was suddenly flooded with brand new sensations, the tendrils of the parasite sliding into his skull as his entire body quivered with sheer euphoria being pumped directly into his brain. As the parasite took control the furred flesh of the lupine's muzzle and head throbbed and bulged from the invasion, even poking out of his ears as his entire body remained frozen in place. There were a few shivers and spasms, his head thrashing back and forth a few times, before finally the lupine slumped forward and his body went still. A few seconds later however his head looked back up, his eyes a solid black before he stood up and walked towards the door...

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

A couple hundred feet away a stag that had been out late working in the small forge he had in his backward looked up when he thought he heard someone shout, his ears twitching as he stopped what he was doing and pulled up his safety mask. The way that houses were situated he was a few hundred feet from his closest neighbors that were also on the outskirts of the town. He continued to look over towards the source of the noise, which had been where some city wolf had rented out the cabin in that area, before he shrugged and decided to shut down for the night. His husband would likely already be asleep, the deer grinning to himself as he thought about the stallion sleeping in the nude like he usually did.

It took a few minutes before the last of the fires were extinguished, the area going dark as made sure that there was nothing left active before he took off his protective gear and set it aside. Since he usually worked nights and there was no one around he usually worked in the nude, pulling off his blacksmith's apron and hanging it up to reveal his naked body. Just as he was about to slip on his clothes to make the walk back to his house however he suddenly felt a pair of muscular arms wrap around him. The stag let out a slight gasp as he felt something pressing against his inner thigh, a lustful grin spreading on his muzzle as he believed that his lover had come out to surprise him with a romp in the great outdoors.

Any thoughts that this was his husband however were quickly dashed when a webbed hand pressed against his muzzle and he suddenly felt something slip inside his maw, wiggling around and gagging him as he was licked around his ear. The muzzle of the wolf behind him opened and his tongue thinned out, black liquid dripping form it as it circled the cervine's ear once before it had started to push inside. With the assimilation of the basic physiology of the creature it had made its host it had made it far easier to figure out how to infest them as the tentacle pushed its way easily into the skull of the other male with the drool serving as more of its mutagenic lube. The second the tip of it touched the mind of the creature his eyes rolled back into his head and it could begin the process of seeding him.

With his prey subdued the infested wolf took his thick cock and began to push into the deer, both creatures feeling the pleasure as the parasite used it to subdue this new host while keeping the other one in complete control. The wolf let out a growl as he pulled his hand away from the deer's muzzle now that he was sure that he would be quiet, the tongue of the stag already starting to form a similar change as it turned black and stretched passed his lips. This one wouldn't be nearly as mutated as the host behind it, the wolf looking like an alien movie monster as it pumped its hips inside of the other male. It wasn't long before the lupine reached his orgasm, pumping the deer filled with alien-corrupted seed that caused the deer's rather impressive maleness to darken and his own balls to swell slightly.

It wasn't long before the wolf pulled out of the stag's ear and tailhole, then ran off into the woods towards the next neighbor's house. For the stag he was still reeling from what had just happened to him, his eyes starting to darken as all his thoughts suddenly turned towards his stallion husband, though for a completely different reason as he left his clothes behind and walked towards the house completely naked. With the silent way the wolf had infested and transformed the other male not even the insects had stopped their music as he silently made his way into the house and towards his bedroom. By the time he had gotten to the bed and looked down at the muscular male his eyes were completely black.

A few moments later the stallion awoke with a snort as he felt a weight settle on his chest, looking up to see the shadow of the stag illuminated against the light streaming from the window. "Isn't this a surprise?" the equine said with a chuckle as he looked to see that there was a throbbing cock mere inches from his muzzle as the stag slid closer. "If I had known that you would get so randy from working that forge I would have let you build it years ago."

The infested stag said nothing and merely moved forward to put his throbbing maleness into the muzzle of the other male, watching him take it eagerly into his mouth. Had he bothered to investigate what was being shoved into his muzzle he might have noticed that his mate's member had become longer, or that it bulged with new veins, but by the time the stallion had an inkling that something was wrong it had already passed his lips and was pressed against his tongue. As the thick cock continued to push into him it was the eyes of the stag that gave him away as his head had been pulled up in order to get more of it into his maw, his own eyes widening as he looked up to see solid black orbs that used to be bright green eyes. Just as he let out a muffled grunt he could feel a burst of pre empty into his maw, but unlike the usual cum that he enjoyed this seemed thicker and clung to the sides of his mouth like glue.

With the infected cum so close to the brain of the horse it didn't take long before the tendrils of alien flesh spread out and slithered into the skull of the other male. The stag began to thrust back and forth to give the host more pleasure as tendrils could be seen slithering and pushing out the horse's face and head, even pushing their way out of his ears and mouth before they retracted inwards. Soon the eyes of the stallion darkened until they matched that of his mate, and when it became clear that a new host had been created the stag turned to making sure that they could properly infest others as well. The parasite was keen on letting nature have its way and soon the stag had slid down the muscular body of the other male once more, tendrils of alien flesh pushing their way down the horse's neck as the stag immediately targeted his tailhole.

While the alien creature continued to infest the mind of the horse the stag pushed the corrupted flesh of his tool into the equine hole. It wasn't long before the heavy cock of the other male throbbed and leaked, the seed of the parasite immediately assimilating and mutating it. There wasn't much need to alter the equipment of the stallion, his husband having commented that he was almost too big for him as it was, and instead focused on making sure that when he did get that rod into someone it would seed the new host good and deep. Once they were finished both males wordlessly stood up and walked naked to the door before going outside, hopping into their car so they could drive to the house of a few friends in town...

Meanwhile in the next house over a lizardman slowly opened his eyes as he heard the sound of bottles being knocked around him. He and several other of his reptilian companions from their frat had rented a lake house and turned it into a party destination since they couldn't afford going anywhere fancy for their break. It wasn't the first time that he had woken up on the floor of the living room that was littered with the remnants of the party they had thrown, but what he did see was new. At first he thought that it was just his drunken state causing him to see things, but when he slowly came to he saw that a cobra that prided himself in his conquests was laying with his stomach on the couch while a wolf pounded his tailhole.

Just as he was about to make a comment about it however the situation turned from sexy to bizarre when he saw that the tail of the wolf, which looked reptilian in nature, was completely covering the tail of a carnotaur like a sleeve while he was jerking off. He found himself shaking his head and tried to get up, knocking a stack of beer cans that had been set up next to him. When he did so the wolf's head shot over and looked directly at him, the lupine's eyes pitch black. Though the wolf continued to press his body against the male beneath him the strange tail of the creature pulled off of the other male and slithered over towards him. Even though he hadn't been too far away from the couch when he had passed out the length of the appendage was surreal and he tried to get to his feet only to stumble forwards and fall flat on his face.

When the lizardman attempted to get up once more he froze when he felt something start to slide up his scaly tail. Immediately his body began to shiver from pleasure being fed from that spot as he turned his head back to see that the fleshy tail of the wolf creature had already engulfed his nearly halfway and was quickly rising. He let out a gasp as it seemed to throb and pulsate while it continued to push its way up, causing his body to tremble from the sensations. Thoughts of trying to run were evaporating form his mind as his already hazy mind became completely inundated with feelings of sheer lust...

Suddenly a loud bang and one of the windows shattering that overlooked the lake caused the wolf creature to pull out from both creatures, letting out a snarl before running off through the opening and out into the woods. The combination of the noise and suddenly getting the tail that had been pulling on his own removed sobered the lizardman up quick and he stood to find their horned dragon companion holding a shotgun that was still smoking slightly. "What the fuck?!" The lizardman said as he saw the other two in the living room coming too as well.

"Didn't you just see that?!" the horned dragon replied as he ran over to the window where the creature had ran out and looked outside. "I just came down to get a beer and saw it attack Arnold on the couch!" When it appeared that the wolf had left he ran back over to the couch and set the gun aside before trying to roll the cobra over. "Hey, you alright, what happened?"

While his fellow frat brother looked over to see how the cobra was doing the lizardman decided to see how the carnotaur was, who had stopped stroking his cock but continued to appear to be in a daze. "Hey buddy..." he said, trying to keep the bigger male focused on him. "What was up with that? Do you know what that wolf was doing to your tail?"

"Tail?" the carnotaur said in a spacy tone as he looked down at his naked body. "My tail... feels swollen..." He let out a slight groan as the lizardman glanced over as well to see that it did look a little bigger then he had remember, though it wasn't something he typically kept track of as the carnotaur's eyes suddenly widened and he groaned. "Oh gods... it's inside me... it feels... so... good!"

The lizardman found himself backing away as the carnotaur let out another groan, his body writhing in presumed pleasure as his cock started to throb hard once more. Before he could ask anything else he saw the tail of the creature start to wave in the air before curling forward, his eyes widening when he saw a slit open in it that pushed against the erect cock. It sank down on it and caused the other male's back to arch in pleasure, the carnotaur moaning loudly as his own tail pushed down on him. Whatever the wolf had done to the appendage was apparently kicking into overdrive as it pressed against the muscular chest of the male, who seemed to embrace it as the scaly tip split and wiggled against the muzzle of the carnotaur as the appendage continued to lengthen.

Suddenly the lizardman detected movement in the corner of his eye and found himself tearing his gaze away from what was happening to the carnotaur to where the horned dragon and cobra were, only he immediately wished he hadn't. The cobra had awakened and had his arms wrapped around the other male, a webbed hand against his mouth and his snout pressed against the earhole of the other male. The eyes of the horned dragon were rolled back into his head as the lizardman's throat bulged. When the cobra pulled away slightly he could see a thin black tongue pushing into the ear of the other male, though his main concern seemed to be freeing the bulge that had formed in the horned lizard's briefs. For a brief second the lizardman's eyes locked onto the cobra's pitch black orbs, and when he did he saw a hint of a smile on his face...

Just as the lizardman reached down into his pants to grab his phone to call the cops he was shocked to find that they had been removed from his legs, leaving him completely exposed from the waist down. Before he could look around for them however his back straightened when he felt something starting to push inside him, his eyes twitching slightly and his breath catching in his throat as the rather thick phallic object began to stretch him open. When he tried to find the source of his penetration he noticed that his tail looked... thicker, and when he noticed that it started to feel swollen as it started to twitch and wiggle of its own accord. Realization slowly came to him and he turned back towards the carnotaur, gasping when he saw that the saurian's entire head had been engulfed by his own tail that rippled from base to tip like it was pumping something into him.

The lizardman tried to run but found himself tripped up by his own tail, falling to the ground on his back with a loud thud. When he regained his composure he saw that the rebellious appendage had already snaked between his legs and had formed a slit similar to the one that was on the carnotaur, as well as his cock being fully erect from the stimulation to his prostate. He tried to resist the cascade of pleasure as the tip of his tail stretched towards him, grunting in exertion as he reached up and grabbed it. His tail proved powerful and as his cock was engulfed it became harder to concentrate on the fight, the tip opening to reveal a thick tentacle in the middle along with a few smaller ones that pushed straight into his mouth, nostrils, and ears when he finally had to let go and it swallowed up his head.

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

The bull police officer sighed as he put down the phone, writing down another note on his incident report. While most of the night had been quiet he had started to get increasing calls of strange occurrences that were happening around the town; citizens were reporting seeing people walking around completely naked while others had been seen brazenly having sex in the middle of public areas. "It's not even a full moon..." he grumbled to himself as he made a list of addresses that needed to be checked out before splitting the list into three. "At this rate we're going to have to call the entire squad up in order to try and investigate all of these."

At the moment it was only him and two other officers that were on duty since it was a small town and there wasn't exactly much in the way of crime even during the day. Mostly the bull's job was chasing after delinquents that were out causing mischief or to deal with feral animals that had found themselves on someone's property. There was also some disturbances that were sometimes called up from the buildings that people rented, but they were far and few between since the spacing between them and the town proper meant a large sound buffer. On a normal night he would handle one, maybe two calls... at this point he had about thirty that he was about to split with the other two officers.

"Alright guys, so for some reason there's a group of serial streakers running around causing a nuisance," he said as he opened the door to the break room. "I need you two to check out these... addresses..."

The bull trailed off when he saw that the break room was completely empty, looking around in confusion for where the other two were. While he could count on the two to do what he told them they were rather lazy and could often be found watching television while they waited for something to happen. When he walked around he put a call out on the radio in order to get a location from them, only to get no response as he walked out of the breakroom. Figures that they would disappear when he needed them the most, the bull thought to himself as he went to the front of the police station in order to see if they were skulking about out there.

When he got to the front reception area of the station he did find someone, but it was neither of the officers as his anger turned to confusion. "How the hell did you get in here?" the bull asked as he saw the wolf standing there, and when he approached he noticed that he was completely naked. "Well, saved me the trouble of looking for one of- hey!"

The bull suddenly found himself getting tackled from behind and brought on his hands and knees, feeling a heavy weight on his back that he tried to immediately get out of. When he attempted to roll away it only caused him to get laid out on his back, his eyes widening as he saw who had done it. "Johnson?!" he shouted, looking at the lion sitting there between his legs with the tattered remains of his uniform hanging on his otherwise naked body staring at him with blank, black eyes. "What the hell are you-"

Once more he found himself interrupted as the other officer, a cheetah moving forward and pressing his also exposed groin against his face. The bull tried to shout that this was insubordination but only succeeded in getting a muzzle full of cock as his pants were ripped from his body. Though the fur of the cheetah blocked most of his vision he could see the wolf slowly walking towards the large windows that made up one wall of the station, raising his arms in the air as other naked creatures began to race through the street. That revelation took a backseat however as he felt the mutated cock of the lion pushing into his tailhole while the cheetah slid his own in and out of his muzzle, the bull's body growing more relaxed as blackness immediately began to infiltrate the whites of his eyes...

The parasite-possessed wolf could hear the bull's grunts turn to moans of pure euphoria as he continued to gaze out through the streets of the small town. By this point their numbers had grown where they didn't even need to take over the police station, though at this point it was mostly just to infest those inside as their numbers grew with every sexual encounter the townspeople were having. By morning there wouldn't be a single citizen left unaltered as the infestation spread through the town like wildfire. The sun would rise on a completely different species, and that would just be the beginning as the wolf bared his black teeth in an evil grin.