For 15 years, Rei lived as a wife and mother raising two sons with her husband. Her marital sex life had dwindled, so she secretly satisfied her desires by masturbating in the bathroom—unaware that her younger son had been watching her. One day, her older son, who had a large penis, started teasing her, and in a moment of impulse, she gave him a blowjob. When her husband discovered what happened, their marriage ended in divorce. Meanwhile, her younger son, who had witnessed everything, decided to take matters into his own hands...