"Sex with your girlfriend isn't going well, is it?" Yuri, who knows everything about her son, easily sees the reason why her son is not in high spirits. Yuri continues, as her son is surprised at her correct answer. "You've gotten so used to the stimulation of the masturbator that you can't feel anything from a girl's body." Worried about her son's future, Yuri decides to use her own body to teach him the pleasure of a woman's body. However, Yuri has a masterful vagina that is even more stimulating than a masturbator...