In the quiet of the house, a brother's curiosity gets the better of him. He slips into his sister's room, his eyes scanning her unmade bed and scattered clothes. He opens her underwear drawer, finding a pair of her panties, crumpled and smelling of her arousal. He's never felt so naughty, so taboo. He takes them out, rubbing them against his erection, feeling the dampness. He jerks off furiously, his mind filled with images of his sister in those panties, her body writhing in pleasure.