Satsuki, whose husband is a talented salesman, feels lonely and thirsty when he is away on a business trip. One day, she sees her son naked after a bath and unknowingly becomes aroused. Unable to control herself, Satsuki embraces her son and gives him a passionate French kiss. Rejected by her panicked son, Satsuki has no choice but to masturbate in the bathroom. However, her sexual desire is not satisfied by that alone...