Lesson from Neighbor SM

The Akira family has welcomed several foreign Neighbor, they are going to accept a long-term one. When the student comes however, it's a tall and muscular man. But in contrast with his scary appearance, he seems to be a polite and earnest person. Suddenly, the husband is called to go on a business trip, leaving his wife and the young man alone at home. Meanwhile, the man's sexual urges gradually increase and then finally… what will happen next?.....