Chapter 1: The First Shift
I’m Kenji, and I’ve been assigned to Saiko, one of the fifty brave girls who volunteered for the mutagen experiment. We knew what we were signing up for—radical transformation, both physical and primal. Saiko, at just fifteen, had a fierce glint in her eye from day one, a firecracker of a girl who didn’t back down from anything. Her room, a sterile cube with soft lighting and a reinforced bed, became our little world. I’m her assistant, her companion, and, as the weeks unfold, something much more.
It’s week one, and the changes are already kicking in. Saiko’s weight has jumped from a lithe 50 kilos to 80, her body softening with a new, plush curve to her hips. Her breasts, once modest, are swelling, straining against the fabric of her loose tank top, her nipples dark and pronounced even through the material. She’s still mobile, strutting around the room with a defiant sway, but there’s a heaviness to her step now, a gravity pulling at her frame. Her mood? Electric. She’s buzzing with energy, her eyes darting to me with a hunger I can’t quite place yet.
‘Kenji, don’t just stand there gawking,’ she snaps, her voice sharp but laced with a teasing edge. ‘You’re supposed to help me, not drool over the science project.’
I smirk, leaning against the wall, arms crossed. ‘I’m observing, Saiko. That’s my job. And damn, you’re making it hard to stay professional.’
She laughs, a throaty sound that sends a jolt through me, and saunters over, her wider hips rolling with each step. ‘Hard, huh? That’s a poor choice of words, pretty boy. Or is it accurate?’ Her gaze drops pointedly to my crotch, and I feel the heat creeping up my neck.
‘Keep talking like that, and you’ll find out,’ I shoot back, stepping closer. The air between us crackles. Her scent, a mix of sweat and something sweeter, hits me like a punch. The mutagen’s side effects are listed in the briefing—heightened sexual attraction, indiscriminate and raw. I didn’t expect it to hit this fast.
‘Oh, I plan to,’ she purrs, her hand brushing my chest, bold and unapologetic. ‘This body’s changing, Kenji. I can feel it—every inch of me waking up, hungry. And you’re right here, aren’t you? My personal... distraction.’
My pulse races as she presses closer, her newly rounded ass brushing against me as she turns, taunting. I’m sweating now, the room suddenly too small, too hot. ‘Saiko, you’re playing with fire,’ I warn, my voice low, rough.
‘Good,’ she retorts, spinning back to face me, her eyes blazing. ‘I like it hot. Now, are you gonna stand there all day, or are you gonna help me test just how horny this new me can get?’
Her words ignite something primal in me. My hands find her waist, thick and soft under my grip, and I pull her against me. She gasps, but it’s not surrender—it’s challenge. Her lips crash into mine, fierce and demanding, her tongue claiming territory. I can feel her heat, her body pressing into me, wet with anticipation through the thin fabric between us. My cock hardens instantly, straining as she grinds against me, panting already, her breath hot on my neck.
‘Fuck, Saiko,’ I growl, my hands sliding down to cup her ass, fuller than it was just days ago. ‘You’re gonna drive me insane.’
‘Try keeping up, Kenji,’ she taunts, her voice dripping with lust as she tugs at my shirt. ‘I’m just getting started.’
We stumble toward the bed, her newfound weight making the frame creak as we collapse onto it, a tangle of limbs and desperate need. This is only the beginning, and I know—whatever the mutagen does next, whatever Saiko becomes—we’re in for one hell of a ride.
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