A young married couple lives in the suburbs, but the husband's long commute leaves him exhausted every night, unable to satisfy his wife's desires. One day, the husband's older brother comes to stay overnight. Filled with pent-up longing, the wife secretly tempts her brother-in-law. Drawn to her stunning body, he gives in and takes her. Though she resists at first, her body ultimately responds, convulsing in silent ecstasy beside her sleeping husband. From that night on, the brother and wife begin a forbidden affair. Consumed by illicit passion, a new and dangerous emotion begins to grow between them.