Far from being a lover, he is the only son who is not good at sex. Rei, a mother who did not look at it, decided to use her own body to provide sex education so that her son would not have wrong sexual knowledge. At first, it was only about masturbation and sexual processing such as breastfeeding handjob, but Rei remembers the pleasure of woman with sex that she intended to do only once. The son who knew this pleasure also sought the mother's body further and continued to thrust the mother with excessive physical strength.