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Laboratory Storeroom

The once orderly storeroom had become a complete mess. Heavy shelving units toppled, millions of dollars in equipment shattered, and a carpet floor stained in various chemicals and... other 'fluids'.

But it all meant nothing to the anthros. Moments ago they were humans, terrified of the rampant mania happening outside. Now it had found its way inside, turning everyone left into sex-crazed beasts that relentlessly fucked each other senseless.

A brutish hound was halfway to passing out underneath the hefty chest of a voluptuous feline - all whilst her sluty meows filled the air as the canine's throbbing knot pumped her womb full with his puppy batter.

In another spot, a pair of female reptiles were wrapped around each other, using their lengthy tongues to savor each other's leaking pussies; rapidly flicking between different colors as they came all over each other.

Several macho males had gotten into a violent mosh - biting, clawing and thrashing at each other for dominance. Once they settled down, the weaker of the bunch became the submissive breeding bitches of the strong.

Meanwhile, in the center of the mass hysteria, a huge brown horse anthro was having fun with a 'soon-to-be-inhuman'.

Keith went to town on Zane's horse cock, whilst his meager mouth couldn't contain the anthro's immense girth, he still desired a taste. He fervently licked, from the base to the tip, all the salty pre-cum that dribbled down Zane's massive shaft. The foreplay was making Keith incredibly hard! But Zane's sex pillar was so huge he needed both hands to properly service it, rendering him unable to touch himself.

So far, his transformation had only raised his muscle mass enough to slightly tone his nude body, along with granting him a new pair of razor-sharp teeth. He was pretty bummed about the anti-climax. Suddenly, a strange sensation began rising up inside Keith. It appeared the changes were beginning to ramp up once again, which filled him with lusty excitement - after all, watching all the other anthro's having fun testing out their newly grown 'assets' was making him jealous.

Just what kind of anthro would he turn into?

"Uuhahaahhhhhh...." Zane moaned, clearly in love with Keith's motion. The increasing overflow from the top of his cock forced Keith to pick up the pace, to which he happily obliged.

As he continued to stroke and suck on Zane's cock harder, Keith noticed the space between his fingers had developed a thick membrane, giving them a webbed appearance. Small black claws shot out of his fingertips, Keith had to slow down on the stroking to not scratch his friend's dick too badly. These changes were also reflected in his feet as his ankles rose up and his feet extended outwards, propping Keith atop new webbed paws in a digitigrade stance that brought his head to the same height as Zane's... 'head'.

Keith drooled at the possibility of taking Zane's meat, "c-can I?" He asked. The horse quickly accepted, nodding like crazy as he watched Keith draw closer.

The allure of the horse cock was irresistible; but there was still a bit of hesitation, he was inexperienced. The 'human' inside was afraid he wouldn't be able to handle Zane's length. However, that fear quickly dissipated as warmth and horniness took over. It reminded Keith he wasn't human anymore. His body was telling him... he was ready.

An excited grin grew across Keith's face, once again exposing his new rows of sharp teeth...

"Time to dig in..."

Keith opened his mouth wide as he devoured his meal whole, traveling further and further down Zane's cock, all whilst avoiding to cut through Zane with his fangs. Zane's meat continued to fill up the space in Keith's mouth, soon enough it was slamming the back of his throat - then heading deeper and deeper down his now bulging esophagus.

*Gluck* (G-gawwwwd.... H-he's sooooo thiccckkk.... ) *gluck*

The invasion of his throat-cunt with throbbing horse cock was already enough to get a couple loads out of him, as he continued to suck. Halfway down the shaft, Keith couldn't tell what surprised him more: that he wasn't gagging, or that he wanted to go even further. Eventually he reached his limit, almost kissing the edge of Zane's sheath, he was pretty sure no one else was able to reach that far down on Zane without passing out - but he was just starting. His head relented back up to Zane's tip. Keith continued sucking, now aware just how far he could go allowed him to more confidently treat his friend. The tightness of Keith's throat, the slick caress of his tongue and lips, even the occasional love bite. The unbelievable head Zane was getting from his transforming friend had left the horse paralyzed, frothing at the mouth from orgasmic delirium.

Now Keith's changes were becoming more apparent. His skin now had a coarse greenish-blueness to it as small scales started to pop up around his body. As he continued fellating, Keith's nose grew flatter and his maw grew wider, together they extended together out into a large, round snout. Keith loved feeling it grow, the change opened up new room to pack in more meat....

Pressure was increasing near the base of his spine as the next stage of transformation. His tailbone started pushing out of his behind! It felt really weird, the tail would stretch out till his surrounding skin was taut, causing his body to accomodate for the change by growing more skin and flesh to return the slack, giving him a strange 'human tail'. This sequence continued, and the tail grew longer and longer, eventually able to wag side to side. Once the length began to slow down, a large fin grew out of the tip of the tail. Keith was caught off guard as tail started to fatten and swell in size! It got larger and larger, forcing Keith's supple cheeks apart. "MMMHMMMMM....*gluck*" Keith moaned, quivering and cumming from the pleasure that reverberated around his ass. The tail growth flooded his brain with dopamine - it was an endless high. What was once a feeble rod-like tail, was now a powerful appendage designed for speedy swimming.

Zane's groans and moans grew louder than before, as his body drew closer and closer to climax. "HhUurrrgggghh.... I'MM.... G-gonna... C-c-c-CUMMM...."

Keith could feel it too - he rose up quickly, unsheathing the horse's tool from his gaping mouth. With a slick_*pop*_ Zane's cock was freed from Keith's grasp. The horse could keep it in no longer, climaxing right in front of Keith. The horse neighed wildly as warm seed rained down over his friend, drenching him in thick equine semen once again - only this time, Keith embraced the hot love, instead of rejecting it.

"Ahhhn... you let out soo much~" Keith moaned. His own voice surprised him a little, it had gone up a couple octaves, becoming a little more feminine. He hadn't gotten a good look at himself since he started on Zane; so whilst the horse laid on the floor and cooled down, he went to check himself out in the glass of the windowed cabinets.

What looked back at him was a shark! However, he looked very much different from the other guys (despite the claws and fur). He was definitely still male, he still had a decent cock on him after all, but he looked a little more... girly. His curly hair had grown longer, reaching his shoulders, and had turned dark blue. Whilst other males had become muscular powerhouses, his body had become more shapely - with plump legs and attractive hips that could belong on a supermodel. This was the new 'Keith', and it didn't take long for him to accept his new form eagerly. He gave his huge tail a light stroke, it was incredibly sensitive and felt amazing to caress - Keith giggled happily as he messed around with his new erogenous appendage.

It appeared Zane was out of his refractory period, already stroking his shaft again as he looked Keith again with a sultry gaze. The shark anthro was delighted that Zane was so quick back on his feet... hooves? His libido hadn't been fully satiated yet, Keith wanted to have even more fun with his new body.

"Ready for more big guy~" Keith teased, wrapping his fishtail tight around Zane's dick. He was starting to get the hang of using it, letting it guide Zane to its target as he turned around. Keith got down on all fours, raising his ass up open as he pressed against Zane's hot lovestick.

The horse gave an excited whinny, teasing Keith back as he rubbed his warm rod against Keith's cheeks. However, the horse seemed to have forgotten whose tail was still wrapped around his meat. He neighed in pain as his cock got squeezed relentlessly, milking out what little cum remained. "Staawwpp messing around Zane... ** **** PUT IT IN ME**!"

Zane didn't hold back, thrusting his huge cock deep inside Keith's anus.

"UUUUAHHHHHHHHHAHHHHHHHH!!!!!!!!" Keith screamed, his voice somehow reached an even higher pitch as his ass filled up with horse meat. He could feel Zane heat plowing straight through him, his belly bulging out from the sheer girth poking deep inside. Each and every thrust Zane provided smashed right into his G-spot, making him cum over and over and over again. Whilst his body had become extremely sensitive to all manner of sexual activity, and every touch was pure bliss... this was absolutely different. Zane's love was mind-breakingly potent, Keith could feel his brain was about to explode from the pleasure.

"H-H-HOOOOLLLLYYY.... Urrgghhhhhhh.... F-FFFFUUCCCKKKKK... YOU'RE SOOOO FUCKING HUGEEEE~"

Keith's body responded in kind, it seemed the changes hadn't subsided yet. His moans grew even louder as his round ass began to swell bigger... and bigger... and BIGGER with each pump from Zane's cock! Soon enough, it had grown twice its size! His rump consumed the rest of Zane's shaft within his bouncy cheeks as they clapped against Zane's body. Zane was pleased by this new change, taking a hand away from his semen-splattered friend's waist to give his new endowment a good spanking. The fatty flesh jiggled in Zane's palm, it felt soft and supple as he grabbed on tight to Keith's rump.

"AahAAAHHHHHNNNNN!!!! I-it's not done... mmhmmmm!!! YET??" He moaned, loving the rough play. THERE WAS MORE?! Keith was already content with the new gifts he was given, but to know everything so far was just a fraction of what was in store for him... it was too much. Keith laughed out maniacally as he pressed even harder into the horse cock, the sex was driving him crazy. Zane started pounding Keith even harder, the thickness of his friend's bubble butt was getting the horse addicted.

Keith could feel another rising pressure around his crotch, he took a hand off the soaking ground and started relentlessly jerking himself off amidst the hardcore anal fuck session. Cum was endlessly flowing out of Keith's cock, the perfect lubricant. As he stroked himself, he could feel a new sensation growing just a bit above his own cock. It got stronger and stronger, until... Keith suddenly felt brand new warmth pressing against his stretched out stomach.

"H-huurhhh... h-hold me up... Zane...." Keith begged between thrusts, he really wanted to get a good look at his cock transformation. The horse held up Keith by his womanly legs, leaving his fat ass clapping against the base of his sheath as he lifted Keith up and down on each thrust.

Bewilderment had shot across Keith's sultry face. His once human penis has become large, pink and smooth, with a throbbing knot that pushed out of his largening blue sheath. However, this was not what had him so surprised...

"T-t-t-t-twoooo......??!!!!"

Keith had two penises!! With each one clearly positioned above and below each other. With both claws free, he returned to masturbating once again, this time with a hand on each shaft. Keith's tongue rolled out as he timed his stroking with Zane's pumping. His balls grew larger with each pump by Zane; soon enough they were about the same size as the horse's, filled with ludicrous amounts of virile semen. Keith reached his breaking point a long time ago, he was completely drunk on horsecock!

(YESYESYESYESYES!!!!!!! FUCKMEHARDERINMYASS!! MYCOCKSARESOOBIGITFEELSAMAZING!! HE'SSOHUGE! ZANE'SSOBIG!! FILLMEUP!! GIVEMEYOURTHICKHOTLOAD!!! GAWWDPLEASEIMPREGNATEME!!MAKEMECCUUUUUUUUMMMM!!!!!!)

...........

(AaaAAHHHHH.... My mind... I'm blacking out..... AAHAAAAAAH....)

The two furries started moving faster, somehow their own moans of pleasure had started drowning out the orgasms of the other anthros around. Some came to watch the display, pleasuring themselves as they became enthralled by the two's carnal passion.

"I-I-I'M ALMOST THERE, I'M GONNA C-C-CUM AGAINNNN..... CUM WITH ME ZANE.... P-P-PLEAASSSSSEEEEE......"

...........

"UUUUOOOOOAAAAHHHHHHHHHHHHHHH!!!!!!!!!" The two roared, climaxing wildly as Zane's filled Keith's bussy with cum, swelling out the shark's bulging belly. Keith's double dick shot cum loads in both his and Zane's face. The mating pair turned to each other and started passionately making out, locking lips and licking up whatever remained on their partner's faces. Keith's stomach had grown obscenely huge post-orgasm, it heavily pressed against his twin cocks, filled up with gallons of Zane's cum as he remained stuck on Zane's shaft. However, for the first time since he transformed, Keith felt a little.... content, he had his fill of Zane.

For now...

The other anthros also took this as their moment to release - milk and cum sprayed and splattered against whatever remained standing inside the storeroom, coating the entire room in sticky, musky love fluids.

*shluck*

Zane had unplugged Keith's ass as he pulled out his now semi-flaccid horse cock. Horse cum flooded out of Keith's asshole onto the saturated carpet as his belly slowly deflated. The shark femboy was a little dejected, "*huff* there goes... *huff* my cum baby...." He whined, "god, having your seed slosh around inside me felt incredible..."

Keith fell into Zane's arms and the two lounged together happily in the huge puddle of their own love. "Mhmmm... that was sooo hawwwt. You were real goood back there Zaney~" Keith giggled. Zane could barely make a grunt, but he also sounded satisfied by Keith's performance.

Keith lost himself in thought, "Why the hell were we running away from this? I've never had so much fun in my life...."

Zane could see Keith's ear fins perk up, and a devilish grin grew quick on the shark. He stood up, still leaking a bit; and after wiping away his wet mess, Keith turned to the other anthros who were still enjoying themselves....

"EVERYBODY!" The shark bellowed, immediately getting the attention of every anthro in the room. He pointed a claw to the shabby barricade that locked them all inside, "there are more humans out there...."

The look on every furry's face was clear, they didn't want to remain stuck inside, they wanted to go out and find more delectable meat. After all, new prey meant new anthros to fuck. Just the thought of the massive orgies that would come after everyone had turned was enough to make a few of them cream themselves.

Keith's massive tail thrashed around in horny excitement, "We can't have all the fun.... WE'VE GOT TO SPREAD THE LOVE!!"

The furries howled in agreement, aligning themselves with Keith's cause. They all now shared one goal, to bestow their 'gifts' to as many foolish humans as possible.

Classroom Hallway

A small group of students were running along the hallway, trying to find a classroom that wasn't already full or infected.

One of the lankier female student was lagging behind the others, "*huff* I-I'm sick of all this running..."

The leader of the group glared at her angrily, clearly tired of this whole situation. "Dammit! There gotta be somewhere we can hide till this all blows over..."

A smaller woman in the group, pointed towards the shut door of the storeroom. "What about in there...."

As one of the survivors were about to grab the doorknob, they heard a long_*CRASH*_ from inside...

Moments later, a horde of anthros had burst out! With terrifying power they easily tore through the door and walls that kept them entrapped. Their hungry eyes locked on to the feeble group of survivors - a reward for their escape.

In an instant, The group's screams were drowned in the wave of fur, scales and feathers that washed over them - tearing their clothes to bits and coating them all in an assortment of various fluids.

The unlucky humans were left dazed on the floor, the first targets of the horde. Keith and Zane watched in delight as they all began their transformations, growing out their new bountiful tits and cocks as they got their first proper taste of joy by the rest of the pack. The shark anthro licked his lips and faced the stairs to the third floor, where the laboratories were situated....

"I can smell them up there, Zane..." He said, cackling to himself. "Chase, I've still got to thank you..."

Zane neighed, "Ch-chase.... Friends... f-find.... FFUCCKK!!!"

"You better be ready guys... CAUSE THE HUNT IS ON!!" Keith's shark paw made a wet squelch as he took his first step up. Only now had he noticed just how saturated he and Zane were in love fluids...

"Well, maybe_after_ we've cleaned ourselves up a little..."