A young couple living in the suburbs, the husband is tired from his commute and doesn't have much sex at night. One day, the husband's brother stays over, and he has sex with the frustrated brother's wife. The brother, excited by her wonderful body, crams himself into the resisting brother's wife. Her body reacts, convulsing next to her husband and climaxing with a stifled voice. From that night on, the brother and wife secretly desire each other. They burn with forbidden sex.