Hiroto has lived with his father since he was a c**. - He admires his friend's mother, Rieko, who always cares for her, and before he knows it, he begins to feel something akin to love... - However, being ignorant of sex, he doesn't know how to calm his excitement, so he finally consults her. - Although surprised by his confession, Rieko secretly teaches him how to do it... - Hiroto, engrossed in the sensation he's experiencing for the first time, can't hold back and pushes her down, shaking his hips violently. - Rieko is made to cum again and again by his merciless rhythm...