The siblings, alone in the house, find themselves drawn to each other, their bodies betraying their familial bond. They start innocently, a touch here, a glance there, but it quickly escalates. She straddles him, her skirt riding up, revealing her lacy panties. He can't resist, running his hands up her thighs, feeling her tremble. She grinds against him, his hardness evident through his pants. He flips her over, pinning her down, his mouth finding hers in a hungry, urgent kiss. He pulls her panties aside, sliding a finger inside her. She moans, her hips bucking against his hand. He unzips his pants, his cock springing free. She guides him inside her, gasping as he fills her. He fucks her hard, their bodies slapping together, their moans filling the room. She comes, her body convulsing around him, pushing him over the edge. He spills into her, their bodies slick with sweat and spent desire.