A chubby sister and brother, left alone in the house, can't resist their taboo urges. The busty sister, her big ass barely contained in her tiny shorts, starts fingering her wet pussy in the living room. Her brother, hearing her soft moans, investigates and catches her in the act. Instead of being shocked, he's turned on by her ripe curves and begins stroking his massive cock. They freeze, eyes locked, before deciding to continue, their mutual masturbation escalating into a heated, forbidden exchange.