From a young age, Masato, who is a father-son family, has a crush similar to longing for his friend's mother, Yuri. Masato, who had too much of that feeling, couldn't talk to anyone, and finally consulted with her, who was a person of feelings. - When Yuri teaches him to masturbate with no sexual knowledge, "It's a secret from anyone". Unable to suppress his reason for his first pleasure, Masato pushed Yuri down. Her body, which had not been connected to her husband for a long time, climaxed many times with his sloppy piston that violently scraped the vaginal wall.