"If you've never seen a girl naked, how about looking at your mother?" Worried about her son's lack of interest in sex, Yurine, the mother, shows her breasts to her son as a form of sex education. However, such a reckless act by Yurine explodes her son's hidden partiality for his mother! "It's wrong because my mother is naked..." While his father is on a business trip, the son goes berserk, restrains Yurine's limbs, and makes her cum repeatedly. As Yurine's rationality gradually collapses, she ends up begging only for her son's dick, not her husband's... #ClassMonitorP