Sissy's Stepbrother Craves Her Curves

I never thought living with my stepbrother Jake would turn into this intoxicating secret, but here I am, spilling it all like a confessional in the dim glow of my laptop screen. I'm Sissy, 20 years old, and after a year on HRT, my body's transformed into this voluptuous dream—soft, budding C-cup breasts that strain against my lacy bras, wide hips that sway with every step, and a plump ass that fills out my thongs perfectly. My girlcock is still there, tucked away most days, but it's part of what makes me feel so alive, so feminine. Jake's 22, all lean muscle from his gym obsession, with that chiseled jaw and messy dark hair that makes my stomach flip. We've shared this cozy two-bedroom apartment for six months now, ever since our parents split and we needed a cheap place near campus. At first, it was just sibling vibes—step-siblings, technically, since our folks married when we were teens—but lately, the air between us crackles with something forbidden and electric.

It started innocently enough, or so I told myself. One afternoon, I was in my room changing after a shower, the door cracked because who expects a stepbrother to barge in? I stood there in just my panties, my full breasts perky and nipples hardening in the cool air, running my hands over my curves, admiring how my estrogen had sculpted me into this hourglass goddess. The mirror reflected my long auburn waves cascading down my back, my plump lips glossed pink. Then, bam—the door swings open. Jake freezes, his eyes locking onto me like a magnet. "Shit, Sissy, sorry—" he stammers, but he doesn't look away. His gaze traces my body, lingering on the swell of my breasts, the dip of my waist, the way my panties hugged my thickening thighs. I could see the bulge twitching in his jeans before he finally tears himself away and bolts.

From that moment, everything shifted. He'd steal glances across the breakfast table, his fork pausing mid-air as I bent over in my yoga pants, my ass cheeks peeking out. In the kitchen, his hand would brush my lower back "accidentally" when reaching for a glass, sending shivers up my spine. I'd catch him staring at my cleavage when I wore my low-cut tops, his cheeks flushing as he adjusted himself discreetly. I teased him back, of course—wearing shorter shorts around the house, letting my robe slip open just enough to flash a nipple. The tension built like a storm, awkward silences broken by lingering touches: his fingers grazing my thigh when we passed on the couch, my foot nudging his crotch under the dinner table. I knew he was obsessed with my curves, and god, it made my girlcock stir every time. By the end of the week, I was wet-dreaming about him, waking up with my panties soaked.

That late-night movie session was the breaking point. It was Friday, parents long gone on their separate vacations, just us in the living room with takeout boxes scattered and some dumb action flick flickering on the TV. I'd changed into my favorite sleep set—a silky pink babydoll that barely covered my ass, the lace trim tickling my sensitive skin, my breasts spilling out the top. No bra, nipples poking through like invitations. Jake was in sweats and a tee, sprawled on the couch, but I saw the way his eyes devoured me when I flopped down next to him, our thighs pressing together. "Comfy?" I purred, crossing my legs so my nightie rode up, exposing the smooth expanse of my inner thigh.

Halfway through the movie, the tension snapped. Jake shifted, his hand landing on my knee—deliberate this time. "Sissy," he whispered, voice husky, "I can't stop thinking about you. Ever since I saw you changing... fuck, your curves. They're driving me insane. Those tits, that ass—I crave them. I want to touch you, taste you. Please." His confession hung in the air, raw and needy, his hand sliding up my thigh, fingers trembling as they traced the edge of my panties. My heart raced, heat pooling between my legs. I turned to him, our faces inches apart, and grinned wickedly. "You have no idea how long I've wanted this, big bro."