In the quiet of their home, a brother and sister stumble upon each other's hidden desires. She, a curious teen, masturbates in the bathroom, her fingers dancing over her wet pussy, while he, eager for a shower, catches her in the act. Anger flares, but so does something else. They retreat, only to return, now naked and open, their eyes drawn to each other's most intimate parts. He strokes his thick, hard cock, she touches her aching pussy, and as they're about to give in to their taboo yearning, a sudden noise forces them apart.