I was a thirty-year-old aunt and I was a virgin. Rie Takeuchi

Rie Takeuchi plays the role of a thirty-year-old aunt who is a virgin. She moves to Tokyo and starts living near her nephew Xiaosheng. As they spend more time together, Xiaosheng develops feelings for his aunt and eventually confesses his love to her. The aunt, despite initial hesitation, gives in to her nephew's desires and they engage in a taboo incestuous relationship involving blowjob, handjob, and intercourse. The central kink of the movie revolves around the forbidden and secretive nature of their relationship, with the aunt taking on a teaching role to educate her inexperienced nephew in various sexual acts.