Yuri remarried her husband, who had lost his wife and was living with his son. One day, five years into their marriage, after having sex with her husband, she headed to the shower and saw something. It was her stepson's penis, so big it was awe-inspiring... From that day on, Yuri began to see her husband's stepson as a member of the opposite sex, and a twisted love relationship between her and her stepson began.