One day, Mai visited her uncle's house. Mai, who is in the prime of puberty, is fascinated by men's bodies and cocks. "I'm a bad boy. I have to be punished..." A childhood memory comes back. My uncle who scolded me at that time. The only one who can punish me is my uncle... And then the masochistic training began. The immature buttocks are beaten so that they turn bright red, the milk that has begun to swell is tied up, and Mai wakes up to the pleasure of de M.
