For the past few months, Riho has been shut up and not going to school, and her middle-aged homeroom teacher comes to her house for a home visit. At first, he was concerned about her and listened to her troubles in place of her parents, but gradually his male emotions began to arise and he was unable to control his reason and they ended up having sex several times. The homeroom teacher, who has been single for a long time and has not had a relationship with a woman, thrusts his huge penis into Riho's upper and lower mouths in an aroused state.