Far from being a lover, he is the only son who is not good at sex.Her mother, Rei, who looked at her, decided to give sex education using her own body so that her son would not have wrong sexual knowledge.At first, she was only doing sexual processing such as masturbation and breastfeeding handjobs, but she thought it would be a one-time sex, and Rei remembers the joy of a woman.The son, who knew this pleasure, also sought her mother's body, and continued to punch her mother with her excess physical strength.