He slammed the door behind him and grabbed her by the hair before she could even stand up from the bed. "You think you can just walk around the house in that tiny fucking tank top and not expect me to do something about it?" he growled, yanking her head back so she had to look at him. Her eyes went wide but she didn't scream. She knew better. Their parents were out of town for the weekend and the house was empty except for the two of them.
He shoved her down onto her stomach, yanking her shorts and panties down in one rough pull. "Spread those legs," he ordered, voice low and filthy. She tried to squirm away but he was bigger, stronger, and he had been thinking about this for months. His cock was already out, thick and hard, slapping against her ass as he climbed on top of her. "You wanted this, little sister. Don't lie."
He forced two fingers inside her without warning, pumping them hard and fast until she was wet despite herself. "Fuck, you're soaking already. Dirty girl." He pulled his fingers out and replaced them with his cock in one brutal thrust, burying himself to the balls while she gasped into the pillow. He didn't give her time to adjust. He fucked her like he owned her, hips snapping forward with every stroke, the wet sound of skin slapping skin filling the room.
"Take it," he grunted, one hand pinning her wrists above her head, the other reaching under to rub her clit in tight, mean circles. "You feel that? That's your big brother stretching your tight cunt. Say it." When she stayed quiet he slapped her ass hard enough to leave a red handprint. "Say it."
"My big brother," she finally moaned, voice breaking as he pounded deeper. He flipped her onto her back without pulling out, hooking her legs over his shoulders so he could fuck her even harder. Sweat dripped from his chest onto her tits.

He leaned down and bit her nipple, sucking it into his mouth while his cock hammered into her.
She came first, clenching around him with a broken cry, and that pushed him over the edge. He buried himself as deep as he could go and unloaded, pumping hot cum into her while he growled her name. He didn't pull out right away. He stayed inside her, grinding slow and filthy until every drop was spent.
Afterward he pulled her against his chest, still breathing hard. "This isn't over," he said, already getting hard again inside her. "We're just getting started this weekend." She didn't argue. She just spread her legs wider and let him take what he wanted.