Female CEO Yuko Matsui comes crying to her son after his engagement is broken off. After learning that her son isn't popular because he's bad at sex, Yuko puts on some intellectual glasses and gives him a Spartan sex education! She uses her body to train her son, who doesn't understand women, on how to massage breasts, lick a pussy, and finger him. Next, to cure his premature ejaculation, she licks his anus and balls and trains his penis with a handjob that stops just before the climax! Finally, she has incest with her son's penis, calling it a practice! She screams in ecstasy as her son has sex with her, having mastered the techniques!