A horny sister and brother, bored and alone in the house, decide to pass the time by exploring each other's bodies. She starts by masturbating, using a vibrator to bring herself to the brink of orgasm, her brother watching intently from the doorway. He joins her, taking over with his fingers and mouth, making her scream in pleasure. He then fucks her, hard and rough, just the way she likes it, their bodies slamming together as they chase their climax. They cum together, collapsing onto the bed in a sweaty, satisfied heap.