Bored siblings Michelle and her stepbrother, alone in the house, find themselves drawn to each other's bodies. Michelle, frustrated and horny, begins to touch herself, moaning softly. Her stepbrother, overhearing, bursts in, catching her mid-act. They argue, but Michelle's frustration turns into desire as she looks at her stepbrother's impressive cock. They decide to masturbate together, their bodies aching with longing, until they're interrupted by an unexpected intruder.