Sinccubus - Lesson From Neighbor v2.0

Overview:
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?.....​