Nina, 27 years old, a woman in a small apartment, unprotected sex, SY-208.

Opening the window reveals the Kanda River. In her four-and-a-half-tatami-mat apartment, the married woman learns about pleasure… and also about love. A teacher discovers a student's mother's secret and invites her to his home. "The teacher is troubled," the student says, refusing, but the sight of her wet pubic area after being pushed down and caressed is unbearable. He forcibly kisses and rubs her breasts, then inserts his erect penis into her throat. Despite the saliva, he continues to lick and lick, until the teacher involuntarily ejaculates and swallows it whole. Then the teacher plays with her nipples, uses toys, and forces her to masturbate. Although her sensitive reactions are unbearable, she becomes the teacher's captive.