Horny brother home from college fucks his non verbal high needs autistic sister. The sweet 14 year old girl wants it too clearly

I pulled into the driveway of my parents’ house, the summer heat sticking my t-shirt to my back after the long drive from campus. Summer break. Two whole months back home before senior year. I should’ve been relieved, but all I felt was that deep, aching horniness that had been building for days—no release, no privacy in the dorms, and zero luck with girls before I left. My balls felt heavy, my cock half-hard just from the vibration of the car ride.
Mom and Dad were out for the weekend at some cabin retreat. The house was quiet except for the low hum of the AC. And there was Mia.
My sister was in the living room, sprawled on the big sectional in nothing but an oversized t-shirt and panties, legs kicked up as she watched some colorful cartoon with the volume low. Nineteen, non-verbal, autistic, and ditzy as ever in the sweetest way. Soft curves, messy hair, big innocent eyes. Cute—yeah, she was cute—but she’d never been on my radar like that. She was my sister. Family.
But right then, with my dick throbbing painfully in my shorts and the house empty, my brain went straight to shit I shouldn’t think about.
“Hey, Mia,” I said, voice already rough. She looked over at me and lit up with that bright, vacant smile, making a happy little hum in her throat. She scrambled up and padded over, pressing into me for one of her trademark full-body hugs. Her tits—soft and braless under the thin shirt—squished against my chest. I could smell her shampoo and the faint warmth of her skin.
My hands settled on her waist, then slid lower to cup her ass before I could stop myself. She didn’t pull away. If anything, she leaned in harder, rocking against me like she wanted the pressure. That was Mia—trusting, tactile, always seeking comfort in touch. I’d seen her do it with weighted blankets and stuffed animals her whole life. Right now, my desperate cock took it as an invitation.
“Fuck… I’m sorry,” I muttered, even as I walked her backward toward the couch. My shorts were tented obscenely. She glanced down at the bulge, head tilting in that ditzy, curious way, then reached out and patted it clumsily with her palm like it was just another thing to explore.
That was all it took.
I sat down and pulled her into my lap, straddling me. Her panties were already damp against my thigh. I shoved the t-shirt up, exposing her perky tits, and latched onto one nipple with my mouth while my hands gripped her hips. She hummed louder, fingers threading into my hair, holding me there. No words, but her body said yes—rocking, pressing, wanting the closeness.
I freed my cock, thick and veined and leaking all over my stomach. “You okay with this?” I asked, looking into her eyes. She met my gaze for a second, then ground her covered pussy along my shaft in answer, leaving a wet streak on my skin. Good enough.
I hooked her panties to the side and rubbed the swollen head of my dick up and down her slit. She was slick, hot, and unbelievably tight as I started pushing in. Inch by inch, I sank into her while she made those soft, breathy sounds, her walls fluttering around me. When I bottomed out, balls-deep in my own sister on the family couch, a groan tore out of me.
“Shit, Mia… you’re so tight.”
I started thrusting—slow at first, then harder, gripping her ass and bouncing her on my cock. The wet slap of skin filled the quiet house. Her head fell onto my shoulder, body limp and pliant except for the instinctive clench of her pussy every time I drove deep. She felt perfect. Warm. Yielding. Her ditzy little hums turned into shaky whimpers as I hit the right spot over and over.
I reached between us and rubbed her clit with my thumb. Her thighs started trembling, and suddenly she clamped down hard, cumming around me in silent, intense pulses.
That sent me over. I buried myself to the hilt and unloaded, pumping thick ropes of cum deep inside her until it was spilling out around my shaft and dripping down my balls. I kept grinding through it, riding out every last spurt while holding her close.
Afterward we stayed locked together, my cock softening inside her, her face tucked against my neck. The guilt was already creeping in, but the relief was stronger. I stroked her back, kissing the top of her head.
“Thanks, sis,” I whispered. “I really fucking needed that.”
Summer was just getting started.

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