Two anonymous siblings, bound by blood and boredom, find themselves drawn into a web of taboo desire. In the quiet of their shared home, they tiptoe around their mutual attraction, each one stealing glances at the other's body. One day, as they're both home alone, their restraints snap. She's the first to act, her hand creeping under her skirt, fingers exploring her wet slit. He catches her, standing naked in the bathroom, and the sight of her full breasts and shaved pussy sends him into a frenzy. They argue, but the tension is palpable, sexual. Later, they meet again, this time naked and masturbating openly, their eyes locked on each other's genitals. Just as they're about to give in to their desires, a noise from outside breaks the spell.