The second the front door shut behind their parents, the air in the house changed. Jake stood in the kitchen, staring at his sister Rachel across the counter. She was twenty-one now, home from school for the summer, and she’d filled out in ways that made his cock twitch every time she walked by. Tight tank top, no bra, nipples pushing against the thin fabric. Short shorts riding up her thick thighs.
“You keep looking at me like that,” Rachel said, voice low and direct. “Like you want to bend me over right here.”
Jake didn’t deny it. “I’ve wanted to fuck you since you turned eighteen. We both know it.”
She smirked, stepped around the counter, and pressed her body against his. Her hand went straight to his crotch, squeezing the hard length in his jeans. “Then stop talking and do it.”
He grabbed her ass with both hands and lifted her onto the counter. Her legs spread instantly. He yanked her shorts and panties down in one rough pull, exposing her smooth, already-wet pussy. Two fingers slid inside her without warning. She was tight, hot, and dripping.
“Fuck, Jake,” she moaned, hips rocking on his hand. “Deeper.”
He pumped his fingers hard while his thumb worked her clit. Rachel’s head fell back, mouth open, tits heaving. When she started to clench around him he pulled his fingers out, unzipped, and shoved his thick cock straight into her.
She cried out, legs locking around his waist. “Yes—fuck your sister. Pound that taboo pussy.”
Jake fucked her right there on the kitchen counter, hard and fast, the slap of skin loud in the empty house. Her cunt gripped him like it had been waiting for this. He reached under her tank top, pinched her nipples, and she came hard, juices soaking his balls.
They didn’t stop. He carried her to the living room, bent her over the arm of the couch, and slammed back inside. Rachel pushed back against every thrust, dirty words spilling out.
“Harder. Make it hurt. I want to feel this tomorrow when Mom and Dad get home.”
He spat on her asshole and pressed his thumb in while he fucked her pussy. Rachel came again, screaming into the cushions. Jake followed, flooding her with thick ropes of cum, then stayed buried deep while they caught their breath.
Later that night they moved to her bedroom. Rachel rode him reverse cowgirl, ass bouncing, his hands spreading her cheeks so he could watch his cock disappear into her. She reached down and rubbed her clit, telling him exactly how she wanted it.
“Fill your sister’s cunt again. I want it leaking down my thighs all night.”
They fucked until the sun came up—on the floor, against the wall, in the shower with hot water running over them. Every time Jake thought he was done, Rachel would drop to her knees and suck him hard again, tasting their mixed cum on his shaft.
By morning they were sore, marked, and already planning the next time their parents would be gone. No guilt, no hesitation—just raw need finally satisfied.
Rachel kissed him at the door before their folks pulled in. “Same time tomorrow,” she whispered. “And this time I want your cock in my ass.”
Jake’s grin was answer enough.
The taboo had broken open, and neither of them planned to close it.
