It was past midnight when the house finally went quiet. I stood in the hallway outside my sister's bedroom door, my cock already half-hard just from knowing she was in there. We'd been circling this for years—stolen glances, "accidental" brushes, the way she'd bend over in those tiny shorts when our parents weren't looking. At 24 and 22, we were both adults, but that only made the forbidden part hotter. Tonight the parents were gone for the weekend, and the tension had snapped.
I pushed the door open without knocking. Emma was on her bed in nothing but a thin tank top and panties, scrolling her phone. She looked up, eyes locking on the bulge in my sweats. "Took you long enough," she said, voice low and dirty. "Lock the door."
I did, then crossed the room fast. "You been thinking about this too, little sister?" I grabbed her ankle and yanked her toward the edge of the bed. She didn't resist. Her legs fell open and I saw the wet spot already darkening her panties.
"Fuck yes," she breathed. "I've been fingering myself thinking about your cock since I got home. It's wrong, but I don't care anymore."
I dropped to my knees, hooked her panties to the side, and dragged my tongue straight up her slit. She tasted sweet and forbidden, exactly like I'd always imagined. Emma moaned loud, hips jerking. "That's it, big brother. Eat your sister's pussy." I licked harder, sucked her clit, shoved two fingers inside her tight cunt and pumped them while she ground against my face. Her juices coated my chin. She came fast, thighs clamping my head, cursing my name.
I stood, shoved my sweats down, and let my thick cock spring free. Emma's eyes went wide and hungry. "God, it's bigger than I remember from peeking." She wrapped her hand around it, stroking once, twice, then leaned in and swallowed the head. Her mouth was hot and wet, tongue swirling while she took me deeper. I fucked her face slow at first, then harder when she moaned around my shaft. Spit ran down her chin onto her tits. "Choke on it," I growled. She did, gagging but pushing forward until her nose hit my stomach.
I pulled out before I blew. "On your back. Now." She scrambled up the bed, yanked the tank top off, and spread her legs wide. I climbed over her, rubbed the head of my cock up and down her soaked slit, then slammed in to the hilt in one thrust. We both groaned at the same time. Her pussy gripped me like it was made for my dick—tight, hot, and so fucking wrong.
I fucked her hard, the bed creaking, skin slapping. "You like your brother's cock stretching you out?" I grunted.
"Yes—fuck, yes," she gasped. "Harder. Fill your little sister up." I pinned her wrists, pounded deeper, watching her tits bounce. She wrapped her legs around me and met every thrust. When she came again she bit my shoulder to stay quiet, pussy pulsing around me.
I flipped her onto all fours, slammed back in, and grabbed her hips. "This what you wanted? Getting railed by family?" She pushed back against me. "Don't stop. Cum inside me. I want to feel it." I reached under and rubbed her clit while I fucked her, driving her into another orgasm. Her walls fluttered and squeezed, milking me. I buried myself deep and unloaded, pumping thick ropes of cum into her forbidden cunt. We stayed locked together, breathing hard, my cock still twitching inside her.
We didn't stop there. She sucked me hard again and rode me reverse, ass bouncing while she told me how long she'd wanted this. I bent her over the dresser and took her standing, watching our reflection in the mirror—her face twisted in pleasure, my cock disappearing into her again and again. By the time we collapsed sweaty and spent, the sheets were soaked and we'd both come four times.
Emma curled against my chest, tracing lazy circles on my skin. "We can't tell anyone," she whispered. "But we're doing this again tomorrow." I kissed the top of her head. "Tomorrow, next week, every chance we get. This fruit's too sweet to stop tasting." Outside the window the night stayed quiet, but inside our secret had only just begun.
