Riho, a girl who has not been going to school for the past few months, has become a shut-in. - My homeroom teacher is a middle-aged man who frequently visits my home at the request of my mother, whose parents both work. - At first, he was worried and listened to the parents' concerns, but gradually his emotions began to arise and he could not suppress his rationality and had physical contact with him several times. - The homeroom teacher, who is single and hasn't had a relationship with a woman for a long time, uses Riho's body to insert his horny, uncontrollable big cock into her upper and lower mouth.