Two months into her marriage, Toshiyo has built a happy home with her husband, but she has one worry. Her relationship with her stepchild, Hiroki, who is job-hunting, is not getting any stronger. One day, when Toshiyo goes into Hiroki's room to clean, she witnesses his morning erection sticking out of his pants... Hiroki wakes up and is surprised by the size of his penis, and Toshiyo leads him to ejaculation. Excited by the large amount of semen released from his young body, Toshiyo accepts his insatiable penis over and over again whenever Hiroki asks for it...