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."

I teased him mercilessly, swinging my leg over his lap to straddle him lightly, grinding my panty-clad ass against the massive bulge straining his sweats. He groaned, hands gripping my hips, pulling me down harder as I rocked in slow circles, feeling his cock throb through the fabric. "Feel that? That's what you do to me," I whispered, nipping his earlobe. His palms roamed my thighs, squeezing the soft flesh, thumbs brushing dangerously close to my hardening girlcock. The friction was electric—my nightie hiked up, exposing my lacy thong, his sweats tented obscenely. Mutual desire peaked when I couldn't take it anymore. Sliding off him just enough, I yanked down his waistband. His thick cock sprang free, veiny and pulsing, pre-cum beading at the tip—easily eight inches of rock-hard temptation. "Oh, Jake," I moaned, wrapping my manicured fingers around it, stroking from base to tip in firm, twisting pulls. He bucked into my hand, eyes rolling back. That pushed us over the edge—his lips crashed into mine in a heated makeout, tongues tangling wildly, his hands cupping my breasts through the silk as I pumped him faster, our moans muffled against each other's mouths.

I dominated from there, loving how he surrendered to my feminine power. "Worship me," I commanded breathlessly, shoving him back against the couch cushions. He obeyed eagerly, peeling off my babydoll to expose my perfect tits—round, perky, with dusky nipples begging for attention. His mouth latched onto one, sucking hard, tongue swirling the sensitive peak while his hand kneaded the other. "Mmm, yes, just like that," I gasped, arching into him as jolts of pleasure shot straight to my core. He lavished them both, nipping and licking until they glistened, swollen and aching. My girlcock was fully hard now, straining against my thong, a wet spot forming from my excitement.

Needing more, I stood and stripped off my panties, my girlcock bobbing free—six inches of smooth, girthy perfection, balls tucked neatly from tucking earlier but now free and heavy. Jake's eyes widened with hunger. "Turn around," I ordered, and he did, lying back as I climbed onto the couch in reverse. But no—I wanted his face first. Straddling his head, I lowered my ass onto his waiting mouth in a steamy 69, my girlcock dangling toward his lips. "Eat me, stepbro," I demanded, grinding my tight, smooth hole against his tongue. He dove in ravenously, lapping at my puckered entrance with broad, sloppy strokes, then spearing inside with eager thrusts. The sensation was mind-melting—his hot mouth devouring my ass while I fed him my cock. I rocked forward, sliding my length past his lips; he sucked greedily, hollowing his cheeks, tongue flicking the underside as I fucked his face shallowly. "Good boy, take sissy's cock," I moaned, my breasts heaving, curves bouncing with each grind. He hummed around me, vibrations sending sparks through my body, his hands gripping my thick thighs to pull me deeper. Saliva dripped everywhere—his chin slick, my ass glistening as he rimmed me relentlessly, my girlcock throbbing in his throat.

I could've cum right then, but I wanted him inside me. Flipping around, I pushed him flat on his back, his cock standing like a flagpole, slick from my earlier strokes. "My turn to ride," I purred, positioning myself over him in cowgirl. Gripping his base, I impaled myself slowly—his thick shaft stretching my tight ass deliciously, inch by inch, until I bottomed out, my cheeks flush against his balls. We both cried out; he was so deep, filling me perfectly. I started with deep, rhythmic thrusts, rising and slamming down, my curves bouncing hypnotically—tits jiggling, hips rolling in hypnotic circles. "Fuck, Sissy, you're so tight," he groaned, hands roaming my body, thumbs circling my nipples as I rode him like a goddess. I edged us both, slowing when he got close, clenching my walls around him to make him beg. Sweat-slicked skin slapped together, the couch creaking under us. Faster now—my girlcock flopping against his abs, leaking pre-cum in sticky trails. "Cum with me," I gasped, grinding hard, and he did—exploding inside me with a roar, hot spurts flooding my ass as my own orgasm hit, girlcock erupting ropes of cum across his chest. Waves of ecstasy crashed over us, mutual bliss leaving us trembling, spent.

Breathless and satisfied, we collapsed together, his cock still twitching inside me as I draped my curves over his body, cuddling close. His arms wrapped around my waist, fingers tracing lazy patterns on my ass. "That was incredible, Sissy. We have to do this again—make it our secret routine." I smiled against his neck, nipping his skin. "Oh, we will, Jake. Every night if you want. But next time, I'm pegging that tight ass of yours until you scream my name. Ready to be my good little bottom boy?"