Ryoko, a married woman who lives a peaceful life, has a problem with her abnormal love for her husband's stepchild, Kenji... When she sees her son getting an erection from her stepmother's excessive behavior, she wants to give him the once-in-a-lifetime opportunity to lose his virginity... Ryoko, who has reached the limit of her patience, rapes her son at night while her husband is away on a business trip! She teaches her beloved son pleasure with her intense hip movements!