The son of the Kato family, with whom Sachiko has had a close relationship for generations, comes to her as her fiance! He is still a small boy. When Sachiko lets her guard down, he gets pampered and plays with her breasts, and when they take a bath together, he gets her dick fully erect... As she has no choice but to satisfy his sexual needs, Sachiko becomes sexually frustrated and the two of them have an early wedding night.