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Frankie wasn’t what you’d call a mad scientist. No, correction, wasn’t what he would call a mad scientist. Others might. But they didn’t understand his plan. There was a reason he was lingering around the lab all those long nights in the campus laboratory while he still had access despite having just finished his studies. He’d focused on one thing and one thing only; DNA manipulation. While it was certainly something that he could use for good later on in life, his immediate goal was a kind of obsession of his. Namely, to transform himself.

He had very specifically prepared a viral sample to deliver the genetic payload, the kind of virus that targeted bone marrow. It’d be a painful puncture to inject it into himself, and especially to inject enough of it that his whole body would change, rather than merely parts of it.

His plan? Well, he’d gathered both hyena and king cobra genetic material, and then he’d reduced it to something that his body could be convinced to replicate, given the right application. It’d be difficult even for far greater minds than his, but Frankie’s passion drove him to get it done. And so, here he was, syringe in hand. And for the first time in years, he hesitated. This was an entirely experimental cocktail. There’d certainly be side effects. He’d mapped out as many as he could figure out, and with them, how to counteract them. There was a real risk of him developing a more animalistic mind, however – one that wouldn’t desire to be “cured”.

Come on, Frankie. You spent more than five years of your damn life on this. Time to prove you’ve got the cojones to go through with it.

The syringe felt heavy in his hand, as if filled with fate itself. The tip of the needle was cool against his thigh. It only barely pricked his skin. He’d have to go a lot deeper than that to make it work.

Come. On.

Frankie took a deep breath, positioning the needle correctly, and then bit down on a leather strap he was holding in his mouth. It’s now or never. He pushed it into his thigh, deep enough that it’d reach where it had to go, and pressed the plunger.

“Carajo!” he exclaimed, muffled, growling around the strap. The solution burned, and it burned instantly, and it burned a lot, like his skeleton was on fire for a few seconds.

Anxieties about if he’d actually done everything correctly flashed through his mind. No, he had. He’d double- and triple-checked each interaction, each reaction, everything, but it hurt so bad that he had to fight back the urge to howl in pain. There, finally, it was done. The syringe was empty. Frankie yanked it out of his leg and tossed it across the room in a fit of fury, where it shattered against a wall.

Fuck, fuck-

And then, the pain began to dull. As he’d estimated it would. As he’d hoped it would. It quickly faded into a dull ache, and then nothing at all. He slumped down on the seat. Nothing happened, but then, he wasn’t expecting it to be quick. It’d be a long while before his cells managed to reconfigure themselves enough to actually see anything.

So far, he felt only an almost nauseating mixture of arousal and anxiety, like a skittish energy that left him twitchy, but also rather flushed and warm. Tired, too. Definitely tired.

I hope that wasn’t a mistake. Then again, someone had to be the guinea pig for every great, new stride. History was full of scientists who had been forced to test their innovations on themselves. Some of them never survived to see the fruits of their labour, either, but Frankie wasn’t planning on becoming one of their number. Well, all there was to do was wait. Over and over, he went through the equations and planned interactions.

And so, he went home. It’d still be a few months until he started his real job, but until then, he’d keep lab access. He’d spent so long in there that Daniel – his boyfriend – was extremely excited when Frankie told him he’d have time off, now.

“Hey you! Did you figure out how to save the world yet?” Daniel asked when Frankie stepped inside, bouncing over the embrace his much taller boyfriend. “Oh wait, I see. One of those days?” he added without missing a beat, noticing just how worn his beloved was looking.

Thank god he can’t see the bruise, Frankie thought to himself, surreptitiously rubbing his thigh. This way, he could at least pretend he was only tired because of overworking himself, rather than because he’d subjected himself to the maddest of science. Though sooner or later he’d have to mention it. The sense of warmth had begun to spread out from his leg now, up over his hips. A deep-set, frustrating itch was following it, as if he hadn’t slept properly, or if he’d been exposed to some kind of irritant. Even with Daniel doting on him, he found himself wanting nothing more than to rest, to shower, and maybe get a massage.

Daniel was excited in more than one way, it turned out, though for the first night, Frankie was entirely too tired for that. He couldn’t motivate himself to even get hard, much less to want actual sex. Not to mention that the injection had left him feeling weird, like he wasn’t quite himself, all of his body feeling like, for lack of a better phrase, a suit he was wearing, rather than himself. Yet, it still responded to his will.

Instead, Frankie merely gave his boyfriend a brief hug before curling up in bed. Disassociation wasn’t something he’d been planning on, for this. Yet it shouldn’t last long. Just as he was falling asleep, his first theory was that his mind wasn’t quite recognizing his changing body as itself, not yet at least. It would once his mind changed, too. Sleeping proved a challenge; not so much falling asleep, as getting any rest. The entire night, his mind was preoccupied with chaotic dreams of stress and anxiety, fading into a kind of dissolution later on, one where he could no longer tell where his body ended and those of others began.

His experimental treatment had indeed been successful. Even as he slept that first night, the new DNA he’d ordered his cells to replicate was propagating through his body. For the cells, it was lightning fast. For Frankie as a whole, much slower. After all, even a thousand cells changing made no immediate difference for him.

Initially, only his mindset changed. He became irritable, rather than anxious, frustrated by the tiniest thing, and that feeling of physical discomfort kept amplifying even once he’d recovered enough to feel like his body was his own again. The physical changes were, at first, so slow that Frankie didn’t even notice them happening, and neither did Daniel.

How would one notice if their tongue was ever so slightly slicker, or their feet a little more sensitive? Oddly enough, it was his tongue that was first to transform. Day by day, it continued shifting, the surface of it growing smoother and veinier. That was, as Frankie would later recognize, one of those bizarre side effects. The closest biological equivalent would be, perhaps, a spitting cobra. But even they didn’t have this kind of tongue.

Initially it began to bother Frankie a few weeks after the injection. He thought he’d bit it while sleeping at first, for how swollen and sore it felt. Like it didn’t fit into his mouth quite right anymore, especially when he was aroused, when it seemed to grow even bigger.

He didn’t even associate it with the injection until he looked at himself in a mirror, and was almost startled by the sight. His tongue was round, almost cylindrical – no, it was downright phallic – and definitely bigger than it’d been before. His speech had grown a little slurred and mumbled even when it was soft, and of course, he immediately had to get himself excited to see if the tongue worked like the sight of it hinted at.

It did. Sure enough, the moment Frankie focused his attention to a porn magazine, he felt his tongue twitch with excitement, tensing up and swelling further until it jutted out from between his lips. God, when it did get hard it felt fantastic, pressed so firmly against his lips, and the sight of it – a full cockhead coming out of his mouth – was obscene enough that he couldn’t help but touch it.

That single touch sent an almost violent shiver of arousal through his body, making his tongue harden even more until he had to focus on breathing through his nose. He also felt the insatiable urge to kiss someone using it. Would he ejaculate directly into their mouth? Was it only lust suggesting it, or something more?

Once again the trembling touch of anxiety was there to spoil some part of it. He’d already kissed his boyfriend after this change had begun. Would that lead to anything? No, surely not; there was no way he’d somehow transmit his changing DNA to anyone else. Unless the virus was still active, too.

But then, what would it hurt to try it again?

The more he thought about it, the more appealing that naughty thought was. Though, to avoid startling Daniel, he’d have to do it while he was asleep. Just a quick kiss on the lips. He had to know how it felt.

As he waited for nightfall, Frankie noticed another change. His chest ached. Not in a painful way; no, it was a dull, thrumming ache. A sense of fullness, like his skin was stretched just a little bit too far. That, too, demanded touching. His pecs seemed incredibly tense, and that was probably the source of that feeling, he reasoned, though it was increasingly hard to tell. The more he thought about it, the more he could notice things that seemed just slightly off about himself. Other than his chest, his feet felt bigger too. More sensitive, in a way, and his skin was prickly with goosebumps in several places.

He hoped it wouldn’t get any worse than that. Rubbing his own feet left both his normal cock and that thing between his lips stiff and eager, which – while not entirely unlike his normal state – was a little concerning. If they got any more erogenous he’d struggle to walk around in public without being constantly hard.

“You seem to be a little off,” Daniel remarked, when he found Frankie slumped over his desk.

“Nah, I’m fine. Really, perfectly fine. I just need little more time after all that work,” he lied, while thanking god he wasn’t horny at the moment or all that came out of his mouth would be slurred mumbles.

“Sure you didn’t catch anything in the lab?” Daniel asked. He was nothing if not too curious.

“No, no, you know I don’t work with anything like that,” Frankie answered. Another lie. He did work with viruses. Granted, they weren’t ones that could infect humans. Not unless he had replaced their genetic material with his own custom mix, which he had. But knowing that would only make Daniel more worried; he w_as_ fine, in the end. Soon he’d be more than fine.

Well, night came, and those worries were slowly replaced by the earlier naughty fantasies again. He always stayed up later than Daniel, given his bizarre work schedule, and so that part was nothing unusual. Frankie fidgeted as he waited for Daniel to fall asleep, his cock already raging hard at the idea of just kissing his sleeping beauty.

It'd be harmless, wouldn’t it? The virus really shouldn’t be infectious like this. It was more like a chain reaction within him than anything that could actually leave his body and have the same result on someone else. He snuck into the bedroom as he rationalized it all. Daniel looked beautiful, sleeping soundly, his full lips just barely open. He looked peaceful, utterly relaxed, serene, and attractive. His cock was hard, no doubt lusting for some man or woman in his dreams, but Frankie knew from experience that if he touched that, Daniel would wake up instantly.

Frankie leaned over him, his stiff tongue already poking out. For a brief moment, he hesitated, and then he pressed the increasingly glans-like and dripping tip of his new cocktongue against Daniel’s lips, letting his saliva – or was it precum? – smear over them. The touch was intense enough that it made him huff with pleasure, and that cock-like tongue bucked, drooling something thicker and warmer over his sleeping boyfriend’s lips and oozing into his mouth. Reflexively, Daniel swallowed. There wasn’t much of it, it wasn’t a full orgasm, but watching Daniel unconsciously drink that strange cum turned Frankie on something fierce. The feeling, and that surrender to the perversions of his changing flesh, seemed to speed the changes up. The ache in his chest grew tenfold, perhaps, into a pleasant, fuzzy sense of pressure.

Something similar began to happen behind his balls, too. A warm, damp itchiness. Frankie retreated. He didn’t want to wake Daniel up like this, and he had to watch the changes happen. It was far too erotic, and there was no way to hide his rock-hard cocktongue from his partner either, if he were to wake up. Hopefully he’d be able to accept it rather than being disgusted. Frankie shivered at just the though of properly kissing Daniel with it, thrusting it deep into his mouth, or perhaps even into his throat.

He tore his shirt off with a feverish urgency the moment he was in his office again. Yes, there was no mistaking it. His chest had begun to swell into something feminine, with what seemed like A-cup breasts so far, soft and sensitive in contrast to the rest of his body, with a pair of perky, stiff nipples with areolas bumpy with lust. It should’ve worried him, but somehow, all the changes that were occurring had begun to feel natural. Experimentally, he tweaked one of those little nubs and let out an involuntary moan of arousal. Joder! Dios mio that’s sensitive, fuck. Not only sensitive, but something wet had coated his fingers when he did it. Was he… lactating?

Frankie’s breath caught in his throat as he thought about what was happening. Was he becoming a hermaphrodite? Did the itchy sensation between his legs mean he’d be growing a pussy, too?

When he inspected himself closer, he realized that is body hair had grown thicker and softer, too, bar for some spots that felt dry and stiff, almost like… scales. So it was working in the way he intended. Had he used female genes from either the cobra or the hyena? That was something he hadn’t considered before, and he broke out in cold sweat realizing his mistake. Then again, it didn’t feel bad. And the idea of having sex as both a male and a female was strangely attractive. And, on top of that, there was nothing he could do to stop the process. All he could do was enjoy it, as much as he could, whatever happened.

Unbeknownst to both, Daniel had already changed a little, too. It’d taken much longer, with the smaller dose of the mutagens Frankie had unwittingly created, but it was happening; his muscles were already firmer and stronger than before, with bulging biceps and well-defined abs that he’d not had before. Strangest of all, he was a little taller too. Yet, with how slow and subtle it all was, he’d never noticed, nor would he for a good few days yet.

The next day Frankie spent alone in his lab. Everyone was still on their vacation, so he had the whole place for himself. Of course, he wasn’t doing much in the way of science or experiments. No, it was his private space to observe the transformations happening to him. His eagerness seemed to quicken them. By the end of the day, he undeniably had breasts, two pleasant handfuls, and equally obviously he was lactating a sweet, fatty kind of milk. At that point, his mind had changed enough that the worries were gone too, but the itch and discomfort weren’t relenting.

Something that did please him was the fact that his cock was growing too. At least he wasn’t about to become a full woman despite the deepening warm cleft behind his balls. Rather, he felt like he was becoming something more, something hypersexual and obscene, with a massive shaft and needy, wet pussy, and hefty tits to draw more attention to himself.

The worst part was his growing fur. Every inch of him felt so itchy that he had to rub himself against whatever lab equipment was available just to tolerate it. And his cock felt distended, not yet used to the added girth and length, and so his hands were constantly on it, stroking and massaging it, leaking that evidently infectious precum here and there where it could begin to transform the next lot of students who came in and unknowingly touched it. Yet, he couldn’t help himself. The moment he stopped pumping at his cock, the pressure became too much to bear once again. The itch threatened to overwhelm him. The moment he felt his new pussy wetly yawn open, he was slowly pushing a sturdy test tube into it, moaning in near paroxysms as those unfamiliar inner muscles clenched around it.

It was all too much. He came, and he came hard, his juices coating the tube and a massive gout of cum spurting from his flexing, thick cock. It splashed over his face, which was already more muzzle-like than he remembered it, and he licked it up eagerly, savouring the musky, almost animalistic taste. He found it delicious. Enough so that he didn’t bother cleaning up the rest of the cum that’d ended up in puddles on the counters and equipment both. That’d be something for the students to enjoy.

Finally, he collapsed onto the floor, spent, and almost immediately the discomfort returned, forcing him to continue pleasuring himself, stroking his cock and pumping whatever was available into his new, thirsty cunt.

Daniel was tossing and turning in bed. What Frankie hadn’t considered for his experiments was that viruses tended to mutate, and so had the ones in his body. He’d expected them to remain the same, and within him they did, the dominant original strain already having control of most of him. Yet, what he’d happened to give to Daniel had already changed, wildly so. Gone were the hyena and cobra, replaced by wildly recombined DNA. It was faster, too, again on the cellular level, but faster. Especially with the additional dose Frankie had just given him. Daniel didn’t know it, but his cock had already lengthened, from a modest six inches to an impressive eight, and it showed no signs of stopping.

The last few days, Frankie spent in almost total isolation from Daniel, claiming that he’d simply caught the flu, yet unwilling to let Daniel take care of him for obvious reasons. There was, of course, one problem. He still had to go to the lab to pick up the notes he’d left by accident before the next semester started. He’d lose not only his reputation but likely his freedom as well if anyone were to find them. Or see him as he changed, for that matter. That’d be a one-way ticket first to the experimentation labs and then into the history books as another scientist felled by his own invention.

The next change, as Murphy’s law would predict, happened when he was on his way to the lab. Suddenly, he lost his footing as his feet began to morph into something stiff and scaly, and that wasn’t all. He could see a muzzle forming between his eyes. He pulled his hoodie over his head as fast as he possibly could, clambering back to his feet only to realize they were Incredibly sensitive despite their roughness. He bit his lip to suppress a moan, knowing that several people were in all likelihood staring at him. No amount of focus was enough to will his oversized cock to soften again; no, it was pressing against is jeans and seemingly growing even more, drawing so much blood that Frankie’s thoughts were growing hazy.

He heard someone ask if he was okay, from behind. Frankie mumbled what he hoped sounded like an affirmative response without turning around, and then managed to walk the last few steps to the university building’s door. He swiped his keycard, stepped inside the empty building, and collapsed onto the floor again. None of the changes were painful as much as they were weird, alien sensations that made Frankie claw at the fur beginning to grow in. For a moment, he couldn’t breathe at all as his nose sealed briefly, swelling into something more animalistic. He crawled into a side room to make sure nobody outside could see him, and once there, he let out a guttural howl of, more than anything else, frustration. He pressed himself against the table, grinding against it to try to ease the itchiness, but it was too deep inside to reach.

His stomach was in knots, too. On some level, he realized that was probably a womb developing inside him, but it felt so strange, a pounding ache that radiated into his lower back. And beneath it all, that lusty heated feeling as well, more intense this time. Was he going into heat? Of course he was. He was no longer an average man. In fact, the promise of being bred suddenly overwhelmed any other concern in his mind, and he felt that dampness begin to form between his legs, slowly oozing down his thighs and matting the short, fuzzy fur there.

He barely noticed the cobra hood adorning his neck with his focus drawn fully to his feet. Claws burst from his toes, effortlessly slicing through his shoes. Not that he’d need them anymore. By the time he managed to get the shoes off – breathing a sigh of relief at the eased pressure – he realized his feet were already covered in scales, just like his hands.

He had to get home. Daniel would know how to help him. Somehow.

When Frankie arrived back home in the dead of night he found Daniel stroking what looked like over a foot of hard, eager cockmeat. He had an expression of pure bliss on his face, and from the state of him, it seemed he’d already orgasmed quite a few time, his chest painted with pearly while and his lips covered with the same stuff.

When he heard Frankie step in, he suddenly blushed, closing his eyes and fumbling to put his cock away. Daniel didn’t recognize him at first, so when he saw his beloved – with the bestial hybrid appearance and sizeable breasts – he recoiled in terror.

“No no, it’s me. This just… happened,” Frankie explained. “And I see it’s happening to you, too,” he added with a lusty growl, looking at that hard cock. His insides clenched with desire at the sight of it. “Mh, that’s a tasty cock you’ve gotten.”

“I m- I mean, it’s just… it happened,” Daniel stammered. “And it’s so fucking hot, right? What h-happened to us?”

“Oh, I’m sure it’s nothing bad, not if it feels this good,” Frankie replied, taking another step towards his boyfriend. His juices were running down his legs now, and his own cock – though not quite as long and thick as Daniel’s – bounced with each step he took. “But I bet your changes aren’t done yet. How do you feel?”

“…really uncomfortable,” Daniel said. “And hot. But itchy, like my muscles are all in knots,” he huffed, squirming a little. The beast talked just like Frankie, so while he’d had some apprehension at first, it was quickly fading. He was struck with the sudden desire to latch his mouth onto one of Frankie’s nipples to drink deeply of that… milk. It wasn’t something he’d ever fantasized about before, but right then and there it seemed like the hottest thing possible.

“Which muscles?” Frankie asked. “I’ll help.”

He did, of course, have another plan too. Two other plans, depending on which way Daniel lied down.

“My chest, I mean… it looks impressive with all this muscle but it’s so tense,” Daniel said.

Bingo.

“Mm, I can help with that,” Frankie rumbled, though the last few words were slurred as his cocktongue began to harden again. He straddled his boyfriend and dug his fingers into those hard muscles, kneading them, but not without in turn letting his slimy new slit grind against Daniel’s cock.

“D-do you have a pussy?” Daniel moaned, feeling that wet heat slide along his shaft.

“Mhm, sure do. And that’s pretty good for relieving tension too,” Frankie replied, with a wide grin on his face. God, he was turning into a such a slut, but it felt great. “Wanna try it?”

Daniel snorted, sounding almost equine. Other than his massive cock, it was the first hint of what he was turning into. “Yeah,” he added, voicing his approval of the idea. It turned him on enough that Frankie felt that lengthy shaft buck against his folds.

“Good boy,” Frankie replied. He never even considered if it’d fit – he knew it would – as he positioned that lusty new opening against his boyfriend’s blunt cockhead and immediately began to lower himself down on it as he felt it catch inside him.

There it was. The sweet relief from all the discomfort as they finally did what they’d wanted to ever since they were first inoculated with Frankie’s mutagenic virus. The slick girth sliding into him made Frankie moan out with dissolute, blissful relief. All that itching and gnawing and tenseness faded away, and going by how Daniel’s tongue lolled out of his mouth – which had begun to form into a muzzle during that initial insensate ecstasy – he felt much the same.

“Yeah. Gonna be a good stallion? Make me cum,” Frankie growled, hilting himself on that wonderfully masculine tool. On instinct, he cradled Daniel’s head in his arms and pressed his snout against his breasts. Daniel offered no resistance to that, letting the hyena’s milk flow into his mouth. The first soft suckle sent a thrill through Frankie, one so intense that his cobra hood flared as he began to rock his hips. It was an unfamiliar kind of motion, one that ensured that his silken inner walls stroked every inch of his stallion’s cock, but with how good it felt, he was picking up on it fast.

Frankie, for his part, didn’t last long. Not when Daniel found one of his feet and began to rub it in turn, his thumb pressing firmly against his sole. He cried out – a hissing kind of roar of pleasure – and experienced his first feminine orgasm, sweeping over him like a tidal wave and taking his breath away with it. The next few spasms somewhere deep inside were quiet, overwhelming, and he could barely breathe in at all with how hard his body was milking that horsecock. His wetness gushed out with each pulse, too, the sensation so deliciously sloppy that it almost made him faint. Daniel groaned in turn, clutching his lover tightly, and before Frankie could understand what was happening, he felt that pillar of flesh twitch inside him. It swelled, jerked, and then an even more intense kind of intimate warmth erupted inside him. Dios mio.

Daniel nickered as he drained every drop of his cum into Frankie. His body had almost finished changing, resulting in the form of a muscular stallion a good two feet taller than Frankie, and yet still eager to please, submissive towards his partner. And please he did, with what felt like gallons of cum pumping into Frankie’s new womb as his hoof-tipped fingers dug into the hyena’s thighs, holding him in place.

Yet, Frankie wasn’t satisfied. His neglected cock still needed attending to. The orgasms seemed separate, and so his balls were still painfully full despite the pleasant ache of a climax still thrumming through his new, feminine sex.

“Your turn,” he growled, and pulled up, shuddering at the slickness with which Daniel’s softening cock pulled out, followed by a deluge of spent seed splashing over his lap. “Turn around and I’ll rub your back too,” Frankie ordered.

Daniel obeyed, knowing what was coming, the cum on his chest smearing over their bedsheets as he turned and raised both his ass and tail, presenting himself for his boyfriend.

While the horse was certainly bigger, Frankie’s cock was plenty enough to go around. He smeared some of Daniel’s cum and his own wetness over it and sunk it into his boyfriend’s ass in one smooth motion. With how much bigger he was, there was no pain, only a pleasant sensation of fullness. Yet, his pucker still clung tightly to Frankie’s shaft. That second mating was even more frantic, with Daniel whinnying and neighing as the hyena pistoned into him, eager to seed him in turn.

Daniel’s body felt so firm and warm against Frankie’s, his muscles tense and ecstatic sounds spilling from his muzzle. His ears folded in submission and his ass seemed to be milking him, just barely relaxing enough to even let him pull out.

“Y-yeah, there you go. Take. That. Cock,” Frankie growled, thrusting harder and harder, feeling his balls tighten towards that inevitable conclusion. Daniel’s seed felt warm and wet inside him, slowly seeping out, and that only egged him on to give the horse a potent filling of his own. After a few more erratic, clumsy thrusts, he hilted himself under Daniel’s tail and spilled his seed, cumming almost as much as the horse had, deep inside his boyfriend. It felt even better, that time. Enough so that he slumped down over Daniel’s body before he’d even finished orgasming. It was too much, too much pleasure and too much relaxation from both of his orgasms. And so he laid there, shivering as his cock finished pumping everything he had into Daniel.

“Was this what you were working on?” Daniel finally whispered, after a few moments spent in warm, sticky afterglow.

“Yeah. Like it?” Frankie replied, giving another lazy thrust against him.

“Mmh. I wonder if you could make my cock even bigger,” Daniel replied, his mind still consumed by lust as his balls began to refill with that unnatural, animalistic virility. “Or your tits. God, I love those things,” he added.

“We’ll need a lab of our own,” Frankie said, thoughtfully. Not that he hadn’t squirreled home some supplies, but they still needed very precise equipment. “And that’ll cost… a lot.”

Then, an idea occurred. “Maybe we could sell videos of ourselves like this,” he continued. “Wouldn’t you like that? Just tapes of the both of us, rutting like wild animals, filling each other with cum over and over again. You breeding me…” he rumbled.

Daniel could only whimper in response. He hadn’t even thought of the fact that Frankie might get pregnant, but his cock immediately stiffened as he imagined it, readying him for another turn.

There’d be plenty of those turns in the future. And plenty more experimentation.