Fiona was having a bad day. A bad semester, really. But this day stood out because here she was, after school for the god knows how manyth time in a god damn row, staring at her final project and making exactly zero forward progress with it. “God dammit,” she muttered to herself, staring at the small metal cage. Cozy was probably a more charitable term for it. The best the budget could afford was more honest. Still, the rat seemed comfortable enough. He had a little wheel and a little hut to hide in and a pile of wood shavings and a little bowl with food pellets in it. And a water bottle full of what was supposed to be a powerful mutagen. But, considering the rat was literally exactly identical to how it had been at the start of the semester, she knew for a fact because she had very thoroughly measured him in every conceivable way on a regular basis, it was very clearly not a very powerful mutagen at all.

“Sorry, little guy,” she said with a reluctant sigh. “I guess you get to stay a normal rat for another evening.” That was the twenty eighth formulation she’d tried, and the twenty eighth formulation that had done jack shit. She’d tried just about everything and none of it seemed to work and she just couldn’t fucking figure out where the mistakes were. Maybe she just wasn’t cut out for mad science.

The goal of the project was to create a formula that could increase biomass. If anything, the rat had lost a little bit of weight since they’d started. In fact, it was the picture of perfect rat health, which would have been great if that’s what she was fucking going for. But she wasn’t. This wasn’t a “make rats fit and strong and healthy” chemical, it was a “make rats get bigger” chemical. “Maybe the increased muscle mass counts? No, no it doesn’t. How’s the bone density... Ugh, forget it. This one’s definitely a wash.” She sighed sullenly. “On to formulation twenty nine. That’s not gonna be a waste of my time.”

It wasn’t the failure that got to her, really. She could handle fucking up once or twice – she was a college freshman, not a seasoned researcher. No, no, the problem was the constant failure, to the point where she needed extra time and help. The fact that Dr. Bunsen was a magibiologist major and not even in the mad science program at all was just insult to injury. But she was very heavily involved in the mad science program anyway. And, well, she needed the lab space and Dr. Bunsen had kindly offered to share. So she accepted. It wasn’t like refusing would do anything good for her.

And anyway Dr. Bunsen was super fucking hot. Big tits, fat ass that filled out her lab coat very well, and the way her ears dangled juuuuust slightly over her eyes seemed more a calculated way to look seductive rather than an inconvenience. Fiona tried not to get distracted by the older student, instead focusing on her own work, and failed miserably. She glumly reached over and grabbed a small handful of the peanuts she’d been snacking on all evening – a bit of a cliche for a squirrel, yes, but they were easy and convenient. She probably shouldn’t be snacking while she was working, lest the nuts contaminate the formulas, but at this point the worst case result from that would be that the formula would do something.

“Hey, kiddo, it’s getting late.”

“I know.”

“Any progress?”

“No. I think I’m gonna give up and transfer to a liberal arts degree.”

“Hey, now, it’s too early to give up.”

“I’ve been at this for months, Dr. Bunsen. If I was gonna succeed, I would have by now.”

“They care more about the literature than physical results, kid.

“This is mad science, what’s the point if there’s no physical results?”

“Here, lemme look over your stuff. And don’t call me Dr. Bunsen. I’m not that much older than you and I’m not actually a doctor yet, just Byrna is fine.” 

“O-oh, um. Okay. Byrna.”

“There ya’ go, kiddo.”

“Byrna,” Fiona said again. It felt weird to say. Not that Dr. Bu- that Byrna didn’t have a point, mind. But she was still basically a doctor. A grad student, yes, but a grad student who was extensively helping the faculty and basically already faculty in all but name.

And also there was the fact that Fiona kind of had an enormous crush on her. Factoring in that, was it any wonder that abruptly being on a first name basis with her felt weird?

So, naturally, it didn’t help that rather than stand beside Fiona to read her notes, Byrna instead just sort of leaned over her. Her fat tits pressed against the back of Fiona’s head, and the squirrel swallowed heavily at the very tangible reminder that Byrna was stacked to hell and back. Size ‘a fuckin’ watermelons. “So where’s the problem?”

“I, um.” Fiona adjusted her thick glasses. Where Byrna had a sexy scientist vibe going on, the squirrel was just frumpy. Thick glasses, small tits, no curves to speak of. Byrna’s breasts were a tangible reminder of how big Byrna was, but also of how small Fiona was. “I don’t know.”

“Ah. Yeah, that’d be the problem, wouldn’t it?”

“I’ve tried everything.”

“Well, there is one thing it looks like you’ve not tried,” Byrna replied after scrolling through Fiona’s documentation.

“There is?”

“Well, it looks like you’ve only tested it on lab rats.”

“Yeah. That’s normal, right?”

“For most disciplines, yes. Stand up.” Fiona followed Byrna’s orders unquestioningly – it wasn’t exactly a difficult request to comply with. The larger bun moved the office chair out of the way and then, staying behind Fiona all the while reached over and lifted the water bottle filled with pure, undiluted mutagen out of the rat cage. “Mad Science isn’t most disciplines.”

“I mean... I guess?” Intellectually, she knew that Byrna wasn’t wrong. Mad science just worked differently than other disciplines. Rules didn’t apply the same way, most notably that repeatable results were next to impossible as a direct result of the very nature of mad science. It was the study of chaos, of where magic and chemistry and biology and physics and genetics all collided into an unpredictable maelstrom of transformative effects. But, well, she didn’t know what that had to do with the current situation. “Mad science still needs test subjects though, right?”

Byrna giggled. “Yes, yes. But, well, there’s a longstanding tradition in mad science of using yourself as a test subject.”

“Oh. Yes, um, I’ve not tried that yet.”

“This little guy prolly came from a long line of mad science lab rats, it wouldn’t surprise me if they’ve all got an all-purpose genetic resistance to mutagens.” The rabbit placed the bottle in Fiona’s hands.

“I, um. I don’t know. All my professors say that testing formulas yourself is dangerous.”

“Don’t worry, I looked over your notes, I’m reasonably certain it’s safe. Besides, I’m here to supervise.”

“Well, um-”

Once again, Fiona found Byrna’s breasts pressed against the back of her head. The rabbit was only five foot eight, but Fiona was only four foot ten so the size difference left the squirrel’s head tit-level anyway. So of course when Byrna hugged her from behind it left her head almost completely consumed by cleavage – especially since the bun was actually pressing against her. Pulling the smaller squirrel into a tight hug, hands resting on modest b-cups.

This was also roughly the point where Fiona realized that Byrna was a futa. She didn’t know if it was natural, or if she’d at some point this evening she had grown a dick specifically for this eventuality, but in the end that semantic difference didn’t matter much. All that mattered was the sizable bulge pressing firmly against the small of Fiona’s back.

“Tell ya’ what,” Byrna said, her voice soft and seductive. “If this doesn’t work, I’ll make sure ya’ don’t get anything permanent and detrimental and then we’ll go out someplace nice. Bill’s on me.”

“U-um,” Fiona muttered, suddenly very turned on. Being a poor college student, free food was a very tempting offer, but she was having a hard time not thinking about Byrna’s cock. “And if it does work?”

“Well,” Byrna said, her grin audible. “Then we have some fun.”

That was enough to convince Fiona. She hastily unscrewed the drip feeder from the water bottle, tossing it aside unceremoniously before chugging the remaining mutagen.

“There. That wasn’t so bad, was it?”

“It was okay,” Fiona replied. It hadn’t tasted bad, thankfully, but it’d not really tasted good either. Mostly it had tasted like, well, water. If she didn’t know any better, she’d have said it was water – and as it was she wasn’t convinced that’d be wrong. It didn’t seem to be doing anything. “I don’t feel any different.”

“Give it time to kick in.” Byrna continued to squeeze Fiona from behind, pulling the hug tighter. “You just drank it.”

“Yeah, but I drank a lot of it,” she replied. Actually, probably too much of it now that she thought of it. It was, at least in theory, an incredibly potent transformative. Were she not so completely desperate for literally any kind of result, she would have diluted it significantly before even considering giving it to the lab rat. Even if she were fairly certain it was completely ineffective given the rat’s complete lack of any mutations whatsoever she still probably should have only taken a few drops at most. A feral rat had radically different biochemistry than a person did, after all, and there was no telling how differently it would behave in her.

Of course, it was difficult to be too worried about potentially overdosing on mutagen when she was being molested from behind by a very attractive woman. All pretense had been dropped, it seemed, and Byrna was outright groping her modest B-cups. It was incredibly difficult to focus on anything else aside from maybe the fact that Byrna was showing off an awful lot of cleavage considering they were in the lab. Her head slid past the mostly unbuttoned blouse and the conspicuous lack of a bra, getting buried completely by soft, white-furred titflesh. God, she smelled so fuckin’ good. Sweet and floral and warm. Her head swam, overwhelmed by the groping and the scent. “Just relax and let it happen.”

That wasn’t too hard for her to do. She’d probably have a harder time not relaxing and going with the flow. Not with the way Byrna was playing with her tits – and certainly not once she decided to take things a step farther. “Oh fuck,” she hissed as one of Byrna’s hands snaked its way down her slender waist, slipping under her skirt’s waistband and started to firmly rub against her panties. “O-oh, that feels gooooooood.”

“I bet it does,” Byrna cooed in response. She rubbed her face against the smaller squirrel’s hair affectionately, gently nibbling at an ear. Fiona moaned slightly, prompting a confident grin from her larger partner. Partner? Was that really the right word? In Fiona’s mind it felt like it implied dating, which wasn’t really the case. They were just colleagues who happened to be having sex in the middle of the lab, is all. Byrna had, at some point, removed her other hand, which the squirrel barely even noticed until she used it to lift her shirt and then resumed her groping.

It wasn’t really that different from when Byrna squeezed her tits through her blouse, really. There was still her modest bra in the way so it wasn’t like the rabbit was outright grabbing her bare tits. But something about it was different. Getting that one layer closer to bare fur sent an electric heat down Fiona’s spine. The familiar building tightness of mounting orgasm accompanied by a mild nausea.

And beyond all that, something else. Something different. Fiona had never been the most eloquent person in the world. She was a scientist, not an author or any other kind of creative. She wasn’t good with metaphor or description, and so she struggled to actually put into words that strange, lurking sensation. All she knew was that it was unfamiliar, and that it was very very nice. Like... well, again, even at the best of times she wasn’t good with words. This was not the best of times, considering that Byrna had just pushed her panties aside and actually inserted fingers into her.

Something clicked. That was really the only way that Fiona could conceive to describe it. Like some threshold had been crossed. That unidentified sensation intensified in time with her orgasm. Her eyes rolled back into her head, and were Byrna not holding her she’d probably have fallen to the floor. As it was, she went almost fully limp in the larger bun’s arms, her body quivering with climax. She felt full and hot and heavy, and getting fuller and hotter and heavier as, finally, her biomass increasing chemical actually increased biomass.

She could hear her bones, creaking and cracking and groaning as they lengthened and thickened and grew. Her whole body stretched taller – she could feel it happening, her body rubbing against Byrna’s as she grew. And she wasn’t just getting taller, it seemed. Her fattening ass pressed firmly against Byrna’s bulge, and she found her body instinctively grinding against it. “Oooh, someone’s getting ahead of herself. Don’t worry, we’ll get to fuckin’ soon enough.”

“Mnfffffff~” Fiona replied, pressing her widening hips even more firmly against Byrna’s hips even as she found herself no longer level with them. She wasn’t sure how big she was gonna be getting, but clearly she was going to end up taller than Byrna. Already, the bun had to reach up slightly to squeeze her boob. Speaking of which, her bra felt awfully tight, something she hadn’t really noticed down below, and she could feel Byrna’s hand sinking into increasingly soft flesh. “Yesssssss,” she hissed eagerly.

“Here, let me help you with that.” Fiona let out a small, pitiful moan of protest as Byrna slooooowly pulled her fingers out. She lifted her hand up, holding it in front of Fiona’s face long enough for the squirrel to get a brief taste of her own fluids from the bun’s soaked and sticky fingers. She tasted good. Sadly, Byrna seemed to be in a teasing mood – she moved her hand under Fiona’s straining blouse to join the other in undoing her bra. “Oooh, strapless,” she cooed, quickly and deftly undoing the latch and letting the lavender fabric fall down to the floor. “That’s a cute bra. Shame it doesn’t fit anymore~”

Fiona didn’t respond beyond some moans, so Byrna took the lead (as though she hadn’t already taken the lead for the entire evening.) She pulled away from the now larger squirrel, turning her around and pushing her backwards so she found herself sitting on her desk and then in short order lying on her desk. Byrna lifted her legs, spreading them apart. “Toldja we’d get to the fuckin’ soon enough~” she cooed.

Byrna moved quickly, undoing the simple clasp that kept her skirt on and allowing the fabric to float uselessly to the floor. She was, Fiona realized, going commando. Her cock was a fairly sizable ten inches, by the looks of it. Intellectually, she knew that there were much larger dicks out there. But from the perspective of someone with exactly zero sexual experience, it was mildly intimidating. There was only so much room inside of her body, after all. There was a sudden level of reluctance, juuuuuust enough not to actually make any real difference in how she reacted but still enough to add a little bit of a thrill to the proceedings.

Byrna didn’t really care one way or the other, it seemed. She didn’t hesitate in the slightest, grabbing Fiona’s still thickening thighs and thrusting inside of her in one motion. The squirrel opened her mouth to scream, but no sound came out. Just a soft, strangled gasp. There might indeed have been larger dicks out there, but Byrna was definitely big enough to leave her virgin cunt delightfully stuffed. The rabbit didn’t give her time to get used to the new sensation, pulling out and then thrusting back in, out and in and out and in with a steady but wild rhythm, fucking Fiona like a god damn animal.

Fiona wasn’t completely inexperienced. Yes, she was a virgin, but she’d owned dildos and she’d used dildos. It wasn’t exactly the same, yes, but it was close enough. Or at least she’d thought of it as close enough back before she’d actually experienced the real thing and learned quite pointedly that no it actually really wasn’t close enough in the slightest. It blew her previous experiences out of the water – though, granted, the fact that the mutagen was still doing its thing in her system probably had something to do with it. “Gnnnnnn somethin’s happeningggggggg!” she moaned.

“Gonna cum?”

“Noooo it’s something elllllllllse~” She once again struggled to describe it. Her instinct was to get dry and clinical, considering this was technically a science experiment. But, somehow, the fact that a cute bunny with huge tits was currently balls deep in her made her want to come up with something sexier, even if the only person who would ever hear it was her. There was a sort of tightness and a fullness, similar to how she’d felt before she started growing. But this wasn’t the same, she was fairly sure, even if she struggled to articulate the exact semantic difference, even discarding poetic language. It seemed... almost concentrated. Like it was focusing itself on specific points of her body. Points of electricity running down her torso in a line.

That was roughly the point when she realized what was happening to her. Juuuuust in time for a second set of nipples to blossom beneath the first. She quickly reached up and grabbed at her budding second set of breasts, and was rewarded by getting to feel them get bigger underneath her hands. “Oh fuck yesssssss,” she hissed, even as a third god damn pair of tits began to come into existence.

“Oh! Well, unexpected but not unwelcome.” Fiona had no idea how Byrna managed to remain so fucking coherent. The squirrel had been reduced to a quivering mess, just barely capable of begging for more, and here was Byrna forming full fuckin’ sentences. “Now I’m curious if anything else is going to happen.”

“Fuuuuuuck~” was all Fiona could manage, accompanied by a creaking, grinding noise. Bones shifted, skeletal structure altered, as her torso lengthened to accommodate the extra tits, and also the matching two pairs of arms that erupted from beneath her original set, destroying her blouse in the process. Fiona, operating on instinct, quickly put all six arms to work playing with all six tits. She didn’t really need to, though. She could already feel her climax building in her loins. She wiggled and writhed and bucked her hips instinctively. “I- I- I’m gonna-”

“It’s okay. Just let it alllll out.”

Fiona did just that, allowing orgasm to wash over her in waves. Byrna picked up her own pace, the rhythm deteriorating into wild animalistic fucking. Finally, her calm coherency seemed to vanish into nothingness, replaced with low, needy grunts. Fiona could feel the ten inch shaft throbbing inside her as Byrna slammed their hips together, more and more, faster and faster until finally she fucking erupted.

It turned out that getting pumped full of cum felt really fucking good. Much like the size, intellectually Fiona knew that Byrna’s cumshot was only average volume. She was a student at Harris university, and a waitress at the Hole in the Wall. She was more than familiar with people getting turned fucking spherical. But, well, she’d not experienced that kind of output firsthand, and from her perspective, Byrna was productive enough. She could feel her cervix getting painted white with one, two, three big globs of cum. Her muscles once again gave out from under her, and she collapsed back onto the table.

Byrna pulled out after a moment to collect herself, her cock hanging limply and drooling slightly. “That...” Fiona managed after a moment. “That sure was something.”

“Take some time to recover and take stock of your, ah, new additions.”

“Yeah, yeah.” Fiona did just that, slowly pulling herself off of the table and wandering over to the lab stadiometer to take stock of her new proportions. She was, it turned out, six foot nine. Just under two feet taller. In terms of weight, her quick and dirty mental calculations said she should have been about two hundred and forty five pounds, but she was actually exactly three hundred. That made sense, though, accounting for the fact that she was significantly thicker and also had an extra two pairs of arms and sizable tits.

Speaking of the tits, they sure did exist. Fiona was fairly thoroughly used to her breasts being a certain size, and so it threw her off significantly that she now had six of them, all of which were bigger than what she was used to. The top pair were easily on par with Byrna, with each subsequent pair being slightly smaller. Head-sized to three quarter head-sized to half head-sized. The extra arms were weird, too. She would have to give herself a more dedicated examination at some point to determine exactly how her skeletal structure had changed to accommodate them, but she could vaguely feel an extra two sets of shoulderblades. It felt weird, but having extra arms would almost certainly be handy, once she got used to them. And having an extra set of tits was just plain fuckin’ hot.

“Let me know if you need any help getting back to normal once you’ve got your results documented.”

“Actually, I think I might stay like this. It’s nice to be tall for once.”

“Okay, that makes sense.”

“Thanks for the help, by the way.”

“It was nothing. Just a little bit of advice, from one scientist to another. Still, if you’d like to pay me back, I could use a lab assistant.”

“Now?”

“Whenever’s convenient for you.”

“Now’s convenient.”

“Okay! Just give me a moment to set some things up.”

“Okay,” Fiona replied, heading over into the lab proper. It was, technically, Byrna’s space. A small area of it had been set aside for Fiona to work in after school, but ostensibly most of the space was Byrna’s. However, she seemed to mostly only need about as much as Fiona did – just a desk and some equipment for making whatever serum she was making.

The bun had grabbed a pair of hypo-injectors – a crucial bit of equipment for mad scientists, shaped sort of like potions from pokemon and capable of injecting precisely measured amounts of whatever you needed injected. She handed one of the hypo-injectors to Fiona, then put the other to her neck for a moment. There was a dull hissing sound and then she discarded it. “Just inject yourself with that and we can get started.”

“Oh, um. In that case, maybe we should wait. The mutagen in my system is probably still active and-”

“Don’t worry, so long as the general result falls within certain levels of tolerance, we’ll be good. My results are more important, I just need some help facilitating things.”

“Okay,” Fiona replied, injecting herself with whatever was in the hypo-injector. “What are we doing?”

“Well,” Byrna replied, clearing a space off the top of her desk. “There was an... incident a month or so back that altered the course of my research into Slime genetics.”

“Oh! Right, I remember that. How is your sister doing?”

“Still getting used to things, apparently. Anyway, I’ve since done some significant tweaking to the formula and I think I’ve perfected it.” With that, she bent over the table, wiggling her ample ass in the air. “I just need an injection of protein to act as the catalyst.”

“Oh.”

Fiona wasn’t particularly used to using transformatives and mutagens on herself – a decision she was coming to regret. But, again, all her professors told her that self-experimentation was dangerous. And these were people who did mad science for a living, so she assumed they’d know what they were talking about. Now that she’d actually tried it, however, she was beginning to doubt that assumption. She wasn’t quite convinced just yet that self-experimentation wasn’t dangerous, but... Well, growing extra tits had felt really good. And sure, maybe it had something to do with the fact that Byrna had been fucking her at the time. But suddenly she found herself much more willing to take that risk, if there was the chance of it turning out fun.

Maybe that was the problem, she realized. She’d been so focused on the science part of mad science that she’d forgotten about the mad bit. The whole point, the reason that mad science was its own thing rather than just subsets of various other fields, was that danger. That unpredictability. Mad science wasn’t supposed to be safe, and trying to make it safe would only ever result in it not fucking working. Harris was known for its magical programs, but not as much for its mad science programs. Maybe this was why.

Well, as far as Fiona was concerned, fuck that shit. From now on she was gonna focus on having fun with her work. Embrace the risk instead of cowering from it. An eager grin spread across her face as she felt whatever it was that she’d injected begin to kick in. A burning heat centred directly in her crotch. Whatever progress had been made towards calming down after the results of her own mutagen was almost immediately undone. She grabbed the table with her uppermost pair of arms to steady her suddenly shaky gait, looming over Byrna almost ominously. Her hips rocked, less from her own input and more from reflex as she felt that heat building to a crescendo.

“Mnnnnngggg~” she groaned as thrusting transformed into hotdogging. Her new cock swelled in irregular spurts, several inches at a time. She grabbed Byrna’s shoulders, and also squeezed her soft asscheeks around her growing length. “God you’re so fuckin’ soft,” she groaned, using her last pair of arms to reach around and grope Byrna’s big, soft tits. “Wanna fuuuuuuuuck~” That particular needy grunt was accompanied by a significant growth spurt. God, she had to be three fuckin’ feet long by now. Big, thick, drooling jet black length. Lengths, she corrected herself. Two of them, both horsecocks. She wasn’t sure if that was Byrna’s intent, her own genetics, or her mutagen interfering with the process – though she was fairly sure that at least the fact that there was more than one was the result of her mutagen.

Not that she particularly minded, of course. She had two cocks, Byrna had two holes. That’s just basic math.

She had to do a bit of rejiggering of where her hands were, steadying both her cocks and spreading Byrna’s cheeks to get access to her goals. She wasn’t too worried about lubrication – she had an ample enough supply that she barely needed to put any work into sliding herself in. She went about halfway before deciding that it was time to reconfigure again. She grasped Byrna’s thick thighs and hefted, lifting the smaller bun up with her feet over her head and letting gravity do the rest of the work. Byrna slid the rest of the way down both of Fiona’s cocks, all the way to the hilt. Her cunt and ass filled to capacity and beyond. Two hands kept her legs in position, one cradled her ass while two more returned to squeezing her tits and the final grabbed her shaft and began pumping. “Oh god yes fuck me harder.”

Well, far be it from Fiona to deny a lady such a polite request. She lifted Byrna up – one handed! Clearly another side effect of growing just under two feet taller was that her muscle mass had significantly increased. She doubted she’d have been able to manage this sex position at all not ten minutes ago, let alone lifting the relatively petite bun up and then letting her fall again and again and again, faster and faster, her breath devolving into erratic huffs, jerking Byrna off wildly and arrhythmically. She could feel her testicles – all four of them, because fuckin’ duh – swelling and churning and pulling tightly against her body in preparation for the impending release.

Byrna came first. Her ten inch cock swelled at the base, Fiona could feel it ever so slightly pushing her fingers apart before erupting in several thick, lazy spurts that oozed all over Fiona’s hands. And, of course, her female bits climaxed too, undulating around her cocks like a handjob and a blowjob at the same god damn time. It was all the squirrel could take – her knees gave out beneath her and she collapsed backwards onto her slightly more well padded than it used to be ass. She erupted. Well beyond what Byrna’s much more normal cock could manage, even discounting the fact that she already had the advantage of an extra cannon. The bun’s tum bloated outwards from Fiona’s output, seeming almost fecund. Soft and round and full, stomach and womb alike.

Byrna’s eyes rolled back and her tongue lolled out as she came again, without waiting for her first cumshot to finish. Her ample hips bucked and her body writhed in Fiona’s grip, arcing her back against the larger squirrel. Pressing her body into Fiona’s tits. “Yessssss,” she moaned. “Oh god I can feel it happening. Fuck me! Fuck me harder!” Fiona mostly just kept going at the rate she was going – her climax hadn’t actually stopped yet. She could feel Byrna’s body getting warm, and then warmer. Hot, almost enough that it hurt to touch her. Her cries got louder and more emphatic, her movements more forceful and erratic. She was sweating, copiously – her remaining clothing and her fur were both very quickly soaked through almost completely, and soon so was Fiona’s.

Which was around the point that Fiona began to come down from her orgasmic high and realize that it wasn’t sweat at all.

Byrna was melting.

Fiona panicked, of course. Likely this was at least partially intended on Byrna’s part, considering her specific field of study. But she couldn’t imagine that “turn myself into a fucking puddle” had been the goal. She scrambled, desperately and futilely trying to scoop the blue liquid goo that was sloughing off of Byrna back into place. It did not, of course, work, and if anything it almost seemed to accelerate the damn process. Within moments, there was nothing left of Byrna but a mound of blue stuff in the middle of the floor, in which her lab coat floated idly.

“Oh god I killed her.” Fiona stared in blank horror at what remained of her mentor. “I killed her with my dicks and they’re gonna kick me out of the mad science program and ban me from the campus and probably throw me in jail for the rest of my life.” She reached down and grabbed a handful of Byrna in the hopes of maybe rebuilding her. The puddle was thick and viscous but still very much a liquid, like someone had made jello with slightly too much water and hadn’t let it quite fully set. One solid mass, but without any real structure.

Fiona knelt on the lab floor, allowing what remained of Byrna to seep through her fingers and pool back into the main puddle. She couldn’t really think of anything else to do, so she just kept repeating herself for a few minutes in the hopes that maybe Byrna would de-goo.

Byrna did not de-goo. She did not come together. She kept right on being a semi-liquid pile of slime on the lab floor. “Fuck. Fuck. Okay, um... Don’t panic. M-maybe I can throw together a de-gooing agent or something?” The squirrel pulled herself upright and scrambled her way over to Byrna’s table. There were various sundry reagents and chemicals and tools for mixing those reagents and chemicals together in specific ratios and quantities. She could definitely make something, though she wasn’t exactly confident it would do what she wanted. She didn’t exactly have a history of making things that did what she wanted them to do. Still, she felt like she needed to do something.

One big benefit to the whole situation was that having an extra four pairs of arms was actually really useful. Thankfully, the transformation seemed to have come with the extra brain power needed to coordinate the extra limbs individually. If anything, she almost felt more dexterous than when she’d only had two limbs. Every individual hand was doing something different, perfectly coordinated, like a carefully choreographed dance. Measuring chemicals and mixing reagents and inputting data and preparing the machines, all at once. She found herself quickly absorbed in her work. Her focus completely consumed on fixing... whatever it was that she’d done to Byrna or that Byrna had done to herself.

Which is why it took her a moment to notice the puddle of goo slowly flowing its way up her legs until it reached her cunt. “Oh!” she exclaimed, dropping several vials of random chemicals onto the floor. “W-what? What is- oooooh~” Whatever her train of thought had been was aborted as Byrna enveloped her lower body in translucent blue slime. Some of it wrapped around her cocks, undulating around their sensitive girth. Her erections, which had faded as a result of the unabashed panic over killing Byrna returned in full force as the goo jerked her off. It felt remarkably similar to when she’d been inside of the non-slime Byrna, only all over. It undulated around her cocks, groped her balls, teased her pussy, slid its way inside of her like a dick. A really big dick, one that put Byrna’s original to shame. Several really big dicks, really. One each for her lady parts, her ass, and even both of her cocks, slime worming its way into her urethras.

More of it slid its way up her torso. Enclosing her breasts. It felt uncannily like soft, warm lips wrapping themselves around her nipples, suckling on them and teasing them with gooey tongues and oh god sliding inside of them. Going inside of everything. She could feel slime pumping itself inside of her through her ass, her cunt, her cocks, her tits. Just about every hole short of the ones on her face – and that was clearly about to change as a large mass of blue slime rose up to face her.

“Ah, sorry. One moment, I’m still figuring out how to... be anything more than a puddle of goo. I have a form, I just... need to figure out how to have it and am probably going to have to concentrate to maintain it for a while. Hopefully it’ll eventually become second nature.”

The large mass of goo slowly took shape, shifting and changing as features came into being. Cute buck teeth, long soft bunny ears, eyes and nose and snoot. “There we go. Interesting, Lei was significantly more solid when she first transformed. I guess I’m a bit closer to pure slime.”

“W-what?”

“Ah, yes, I suppose I owe you a bit of an explanation. The original purpose of my research was to boost the immune system with an injection of, among other things, slime tissue into the bloodstream. But, well, then it turned out that my sister has latent slime genes that were activated by the exposure to slime tissue. And, well, from there, horny took over and I spent the past few months perfecting a gooification process.”

“Oh. Okay. So, um, this was the end goal?”

“Well, I hadn’t intended to be entirely liquid. I’m still figuring that out, like I said. But honestly, the whole thing has been an enormous success as far as I’m concerned!”

That was a massive relief. It felt like a weight had been lifted off her shoulders, knowing that she had not in fact killed Byrna with her dick. “Okay, that’s good. Are you gonna be okay?”

“Yes, yes, I’ll be fine. I just... need to deal with some newfound instincts.”

“Newfound instincts?”

“Yes,” Byrna said, her voice shaking slightly. “Instincts.”

She licked her lips.

“Oh. Right. Slime. Just, ah, please make sure to not digest me?”

“Don’t worry, I’m not going to digest my new girlfriend.”

“We’re girlfriends now?”

“Yes.”

“Neat.”

They slowly closed the remaining distance between their heads into a deep, passionate kiss. Byrna tasted pretty good, slowly sliding down Fiona’s throat, into her body through every available hole. Enveloping her completely, inside and out alike. It felt really, really good, better than you would think getting vored would feel.

Fiona came. Copiously. Blue was flooded with white, which quickly became more blue as Byrna’s slime body efficiently digested it – along with her, she realized. She felt herself melting away into nothingness. It didn’t hurt, thankfully – it actually felt kind of good, in a fucked up sorta way. Within a few moments she was gone, just a consciousness floating in the vague amorphous blob that was Byrna’s new body.

“Sorry about that. I’ll have to get better at resisting those urges in the future.”

“It’s fine. It was kinda sexy.”

“Yes, but there’s going to be situations where it won’t be sexy in the future.”

“True, true. Ssssssso, what next?”

“Well, first thing’s first, I’ve got to figure out how to, um. Structure myself into a proper body. I’m probably not ever going to be fully solid, but I’d at least like a shape again. Once I get that down, Lei’s got a trick that I want to try.”

“A trick?”

“She can pull out the body parts of people she’s consumed.”

“Ah, yeah, that sounds nice. Not having a body feels weird.”

“And then from there, well. We’ve got all these chemicals and reagents and mutagens just lying around ready to be recklessly applied to ourselves. What do you say we have some fun with them?”

Fiona had decidedly not been expecting today to go anywhere near how it had gone. She’d (sort of) succeeded at getting her final project to work, she’d had sex (several times), and she’d gotten a girlfriend, and now she was going to have sex even more times. Things were looking up. “I say what are we waiting for? Let’s get started!”