Yuki is a housewife with a happy family. However, she has one concern. Her son, who should be of marriageable age, shows no sexual interest whatsoever. As a parent and a woman, Yuki wants to give her son a proper sex education, so she teaches him how to ejaculate with handjobs and blowjobs. She even uses her own vagina to teach her son how to have sex, fulfilling her parental responsibilities.