Rat in the Cat(Seth to Jane Doe ZZZ TG)

"Nope. No. Not happening. I've changed my mind."

Seth knew it had been too good to be true, already feeling ashamed he had opted for the easy way out. Sure he sucked at infiltration and would have done anything to learn so when he had seen a flyer for "Gain Instant Infiltration Experience" he had immediately signed up, not even reading what it entailed with how gung ho he was about overcoming his biggest hurdle. Of course the second he saw Jane in the classroom any enthusiasm for learning soured into the suspicion that he had been targeted for another of her unwelcome mockeries.

"Aww don't be like that Seth. Why'd you come if you were gonna be like this? I listed my name on the poster. Unless... Oh no, did the golden boy not read the bylines? Tut tut mister rising star. That's gonna be a demerit."

He didn't want to admit he didn't, knowing a choosy gossip like her would make sure to spread it to the people it'd be the most difficult to deal with. He still had criminals mocking him for the one time he'd shrieked at a spider during a stakeout when she'd weaseled that out of him a few months back.

"W-Well no but I doubt you'd take this seriously. I mean what would I learn from an incomprehensible loose cannon. I'll just learn the hard way."

He tried to end it there but Jane persisted, getting between him and the door with a few quick leaps, somehow managing to look down on him despite being shorter.

"And how many missions will you have ruined by responding to your real name? Or accidentally taking your badge out of your pocket while reaching for mission funds? Though my favorite has to be the one time your tail kept wagging whenever they brought up the cops. I swear, sometimes I doubt you're a cat Thiren."

His bushy tail stiffened in shame, making her chuckle as she gave it a stroke, Seth mewling in aggravation. He didn't want to admit it, but she had a point. Clearly she knew a trick or something to control herself or else she'd be dead by now…

"Fine, the flier said it'd provide instant results, but the second you do anything fishy I'm out of here."

Jane gave a happy clap, giggling to herself, "Aww I'm not a fish, I'm a cat Thiren, I swear. I promise I'm not lying, I just shaved my tail, see?"

She was definitely pushing it as it brushed up his inner thigh, Jane always enjoying any chance she got at pushing his buttons.

"Just get on with it. I promise I'll listen."

"Oh really?"

The edge of her tail twitched, a needle sliding unseen out the tip as the triangular end pulled back like a predator ready to strike. Jane gave his cheeks a delicate pat.

"See Sethy, the first problem is obvious. You're far too trusting. At least this won't hurt... too much."

It thrust, Jane's tail ramming up his ass as Seth gave a high pitched yowl, jumping as the hairs on his head stood up like a disturbed alley cat. There wasn't even time to react, Jane's tip stabbing the syringe deep inside his prostate another flick emptied the entire thing before his feet hit the ground.

"What the heeehhllghaaah!"

It wasn't like he couldn't handle surprise attacks but he wasn't prepared for his insides to clench, Seth flushed as his prostate wriggled as a nausea induced churning sent him stumbling for a second. Jane didn't miss the opportunity to further unbalance him, a jab here, her tail tangling up a leg there and a quick running jump and she had him pinned to the ground like nothing, his head locked between her thighs as he squirmed with increasing desperation.

"Don't worry, this will all make sense. I promise this one isn't a lie. See I have a very special infiltration coming up..."

Seth could barely hear her words beyond a distant murmur, the insistent throbbing between his sides worsening as his hips wriggled back and forth. Something was squirming and rubbing against stuff it wasn't supposed to, each thump spreading the heat as it rose up his navel and down his thighs, his cock feeling hot as it stiffened as pressure built.

"Now this fellow has interesting tastes; twin secretaries. And while I can play more than two people even I couldn't sell-"

No no no this wasn't happening some kind of fucked aphrodisiac building down below, Seth knowing if Jane's thighs weren't choking him he'd be grunting like a cat in heat as the spasming center of the heat thrust back and forth, heat climbing up his cock as he tried to clench his muscled, desperate not to-

"And that's really all that drug is. The ULTIMATE infiltration. It’ll take a bit, but a pure boy like you could use some-"

"G-HAA AHHHH AHHHN~!"

Something popped, Seth's pants tearing at the sides as his belt snapped, his cock poking out one of the gaps as he came. It felt like his insides were boiling, his hips thrusting as cartridges scattered to the floor, the tears ripping larger with each pleased shriek till after the sixth he collapsed, gasping between Jane's thighs as she looked at the splattered mess on the floor with disappointment.

"Well I knew the department said you were the first to bust, but I thought that was just your infiltration skills. I thought the top-ranked star would have more stamina."

Seth groaned, hands rubbing against his exposed navel, confused by a subtle, but noticeable softness slowly creeping up his abs near his sternum. There was a dip now, his insides feeling soft as an erotic stirring throbbed with his cock, his sanity briefly restored through the unwanted arousal.

"This nngh i-isn't fuhhhnny Jane what did you d-hoo to- to- Nngh ah ahhh~!"

Another internal pop and his pants were ever closer to breaking, just a few strands keeping the waistband intact as two bony protrusions jutted out. More and more of his bare ass squeaked as it rubbed against the cold station tiles, Seth wondering if he had been dosed with ecstasy as his skin stiffened at even the faintest touch of fabric, something deeply erotic about the smallest of sensations as he whimpered.

"Aww and I even said the truth that time. You kept asking and the one time I really mean it you're too busy wagging your dick around. Or maybe... your ears need to be adjusted."

She licked her lips, giving the weakened catboy's right ear a few strokes as even light contact was enough to make him dry hump the air, his eyes gleaming with need as she waited till she could see the green flecks starting to float inside his eyes. The serum seemed to have hit saturation which meant she could really get hands on with this learning experience. Rather than go through her already abridged summary she went from stroking, to pulling on his ear like a naughty school child in need of more intensive learning. He left a trail of cum as she dragged him, his flailing legs managing to peel off his pants like a banana skin, the ends pooled over his boots as by the time he was near a mirror, his cock was leaking watery trickles of cum his cheeks burning red.

It took him a moment to even notice what Jane was trying to show him, a few tugs focusing his attention when he felt something dislocate, which given his entire body was amped up to the slightest stimulus, an entire ear dislodging and sliding down was equivalent to a handjob, only somewhat counteracted by the horror of his ear's fur clearly darkening, the inner tufts peeling away to a pink as she rotated the upwards cone into a longer, floppier downwards angle. It was a mouse ear, and it left a corrupted trail of black amidst his white scalp.

Jane gave it a tender little stroke, Seth yowling as it twitched, something about it moving at his command making a tiny part of his brain throb. Her fingers slowly trailed towards his remaining upright ear, twirling it with her nails as the thicker fur flattened, Seth moaning as she pinched and folded, feeling something squeeze and burrow into his scalp as she lightly tugged it, drawing out the foreplay as it slid down his scalp to mirror its former twin.

"I-I'm a cahhhht Th-ThiiirEHHHHN~!"

His next release splattered onto the mirror, making a pitiful sight as two mouse ears twitched. Jane realized poor Seth probably thought she was only changing his ears for a disguise or something, giving a teasing whisper in his ears as she grabbed his tail, "That's right, and so am I, don't you agree?"

There was this growing pressure on both sides of his temples, the pleasure of his new ears leaking bits of the serum over his brain as new connections spread with every surge of pleasure. And even with the momentous orgasms that had drained him earlier, nothing could have prepared Seth for the moment Jane gripped the edge of his fluffy tail and squeezed. She squeezed and squeezed till a bulb of flesh strained near the end, Seth on the verge of passing out as cum leaked freely from his cock, white hairs fluttering off as the pink skin was choked a dark greenish black. Something hard and jagged was stabbing into the tender skin, like a razor blade passing through unmentionables, Jane squeezing and squeezing before-

POP

"AH AHHH NO NO NOOOO OHHH~!"

Jane loved watching the realization hit, Seth's new ears folded down in horror. It seemed even when becoming a completely different subspecies he still reminded her of a dog, one who couldn't stop wagging his new tail as a familiar diamond-tipped edge whisked back and forth. He was turning into Jane, and worse, he was loving every second.

"You can't have such an obvious tell Seth. A shame, cause your tail's so adorable, but we have to make your thinking more flexible..."

Seth couldn't even respond, her grip going the opposite directs as she strangled his tail into a slender rat one, feeling like a reverse orgasm as mass squeezed deeper and deeper as she finessed it further down, tufts of his fluffy white hair darkening as they flattened and slid down his brow. The churning in his guts was reaching a fever pitch, barely any testosterone left to expel as the encroaching softness had turned his 6 pack into a 4. He had to say something, make her stop, realizing his bony hips were so much wider, his legs looking softer as something tickled deep inside his cock. Something was going to irrevocably shift in him if she finished his tail and yet the pressure was maddening, like an intense itch spreading deeper, Jane really having to pull as she squeezed an ever widening lump up his shedding tail.

"See this is h-OW you INfilTRATE! Find an easy bACKdoor AND NNGH! FORCE! a WAY! IN!"

There was a spongy slap against his spine, Seth crying as green flecks spread inside his eyes, his bangs spilling in a black curtain as something thrust into his womb. Just like in his head a devastating pressure was building, Jane struggling to work the last half foot of tail into hers, eventually having to press a boot against the small of his back as one hand pulled, the other pushing, something thicker than cum swirling and tangling inside Seth's balls before-

SCHLWMMP

"FUUUUUUUUUUUUUUUUUUUUCK~!"

Something snapped, Jeth screaming as black splotches of liquid pantyhose gushed chaotically out his cock, all of his hair a flattened, long black to match as his spine scrunched. It was a pleasure so grand and overwhelming he couldn't even hold back the cursing, the dirty words coming easier as his left eye burst into a gleaming emerald of ecstasy.

His legs flailed, each kick burning away his toned physique, strength turning dextrous as his ankles popped, boots and torn shreds of his pants flopping off as the dark sprays of cum spread down his legs, the penetration diving deeper than he knew was possible as the pressurized mass burst inside his thighs and ass.

"I wondered how long it'd take to make you break. Such a good boy Seth, though I wonder if you even consider yourself one at this point."

He was wondering that too, grinding his ass against the floor as it swelled, that penetration shifting his preferences irrevocably, or perhaps that was the green liquid multiplying over the folds of his brain as he watched the splatters of dark cum spread and ripple over his shifting legs. Each flex of his toes strained new muscles in his churning innards, his balls pulling in with each flex as his toes wiggled in delight. He just couldn't stop himself, the pleasure urging him on and on as pantyhose spread down his legs, his new rat tail snaring around a calf as it squeezed it to such a firm, curved beauty it just made him want to-

"OHHHHHHHH~!"

There was another subtler thrust, his balls squeezing as they sank, rubbed by their contents as the pantyhose teased his legs into curves, more flexes forcing them in deeper before he had to stop. H-He didn't want to let Jane be right and yet nngh she always knew that adorable cat wanted to get into her shorts, though this was a novel- Jethe groaned, feeling the pantyhose slither over each toe, squeezing them as his balls pressed together, caught between two perfect, gleaming thighs and a squishy barrier that was weakening. Feeling the fat spread down his legs, watching them become Jane's, wh-what would his balls feel like if he- Wait wait-

"H-AAAAAAAAHN AHHH YES~!"

His subconscious ruled his new tail, Jane looking on amused as the slithering limb stabbed between his furled-up ballsack, Jathe screaming as he tore open a slit with a single, masturbatory thrust.

"Aww, it seems like your tail's just as adorably an open book even this far in. Shows just how deep-seated that open heart of yours is, but don't worry, I always know how to drag out what I want. You'll know exactly what I mean soon enough."

She ran a hand down his thighs, enjoying his moans that were growing more boyish by the second. Jathe wanted to deny it, to blame her, but at this point it was impossible to resist, his own tail spreading open his new slit, tearing open the pantyhose before it left dripping wet. He tried to comfort himself that he couldn't think, but even through the lusty haze his own excuses were starting to sound simply adorable.

The softness had swallowed all of his abs during the last bout of orgasms, his core sinking, all those hours hitting the books fading under a bevy of experience, roles and people and jobs filling his head as his lips pursed, his other eye throbbing as it widened. God had he really been such a sucker beforehand? It was like that feeling of seeing your old photos from a decade back only the cringe was mere minutes ago. That felt wrong but then again wasn't that the point of infiltration? And boy was he feeling it infiltrate deeper as his core sucked into a tight curve, his tail slicing upwards as he slid off his bulky men's uniform.

"Good girl Seth. Now let me teach you how to be naughty."

She tore at his exposed nipples, turned on as more and more of his face gave into hers the more he moaned, his voice continuing to rise till it purred out. He tried to panic, wanting to not just give in logically yet the feeling of his nipples beginning to pull with Jane's expert teasing more than made up for the shrinking sense of self. Who he was barely seemed to matter compared to the pleasure radiating out, his tail coiling around Jane's as his naivete and goody two shoes thoughts were given a far more useful spot to occupy as her tits grew with every dirty thought.

"Haaaarder~!"

Jahe could barely believe the things she was learning, lockpicking, seduction, holds, all sorts of perverted ways to make someone stumble and stutter filling her muscle memory as her twin held nothing back in her shaping of their tits. It was enough experience and lived memories to make it feel like she was growing a second brain, Jahe getting in on the molding action as she squeezed his cheeks, moaning as the last of her boyish features matured into sensual, mysterious beauty.

"Ohhh~ fuuuuuuck I think I'm- I-"

She shuddered, Jane watching as a clear stream of fluids moistened the former golden boy's pantyhose, a few familiar squeaks of mousey pleasure exiting as Jane used her tail to slice her new twin's gloves to matching fingerless ones. It was a lovely sight, her mirrored tits jiggling, curves trembling, a satisfied smirk on her face as she checked to see if he was a trapped rat or a devious cat.

"Oh? And what are you?"

Jahe gave a smirk, her tail slithering like a snake as she cupped one of her cheeks.

"I'm clearly a cat Thiren. Meooooow~!"

"See, I told you I was honest."

They both laughed at that one, Jahe giggling until a sudden spasm in her navel made her squeak.

"Oh OHH OHhhh fuuuuck w-we forgot suuuhmthing Jane..."

Somehow through it all her cock was still stiff and standing. It's not like she minded having one, but it was such an obvious tell. Though, p-perhaps leaving just a bit of her old self would be a good reminder before she forgot who she really-

"That'll get in the way of interrogation. Don't worry Jane, I'll do the honors. After all, we have to be identical for this to work."

Jahe groaned as her twin's tail slid into her tip, wriggling the hard shaft as she was slowly dressed, the last bits of her former self coping with the idea of doing anything to serve no matter how lewd, h-how indecent...

"Mmmgh J-Jane I'm n-nahhht sure if I'm r-HEEEADYYYY~!"

Jahe screamed as her cock was thoroughly fucked, the tender tip spread and drilled before Jane pulled it out, pressing the cold flat edge against the loosened cock before pancaking it. She had to admit it was a major turn on to see herself being an honest sub like this, one final tuft of hair bursting out the back of her twin's head as her pussy was drilled into completion, the squirming rat easy to catch and dress as it didn't take long to make them identical head to toe. Another Jane was born, groaning and flexing as if to make sure it was really her, patting at the flatness in her shorts, still unsure of how to feel about having been Seth just a few minutes ago.

"Well how does it feel Jane? Ready for our mission?"

She shrugged, still flexing and stretching about in a matching outfit.

"Yes, but I'll leave the dirtier work to you."

"Sure sis. We'll see how things go."

"I'm serious."

Jane gave a knowing smirk towards her twin, excited to put her to the test.

There were little slivers of Seth still in there, just part of her wider experience pool giving this detached view of the mission. It was like that little voice in your head that told you to do good things instead of bad, not that she let it mess with the mission. Unfortunately that slight meeker edge to her persona made her the favorite for the pervs of the high level trading fraud they were trying to expose, the coming weeks filled with wandering hands, shoulder rubs, ear strokes.

It felt emboldening, the first week nuJane's starched business shirt fully buttoned, the next one undone for comfort and just a bit of cleavage. It helped disarm her targets, nothing more. More eyes, more slips of the tongue, her own so easily sliding over her lips to entice, her skirts shortening all the while the original smirked at how much of a natural she was becoming.

When Jane, or Sheila as her codename, had given her first handjob, half the buttons of her dress shirt were open, her nipples always dangerously close to slipping out. It turned out men had the loosest of lips after they came, bragging about all sorts of illegal activities she wrote down with her tail in a hidden notepad, moving up and up the ladder, the joy of being someone new growing as it was finally time for the boss. He seemed to have the tightest lips of them all, but hers were tantalizingly loose, her tail fiddling with the buttons of her blouse as another popped off, and another.

At some point even the tiny voice in the back of her head had convinced itself that all of this was fine for the mission, ready to be the perfect ditzy secretary, the slutty mistress, the eye candy that you could talk to. Something told her she would be asking for some more missions as she slid out of her office clothes. She really had to thank her sister after this. Perhaps that Wise person could be a fun toy to play if they ever needed triplets…