Ryoujoku Hitozuma Club

凌辱人妻倶楽部 

The main character works as an instructor at a fitness club. He wants to give lessons to young girls, but he is not allowed to do that. One day, he tells Mizuho, his colleague instructor, his complaints and she introduces some of her students, Kumiko, Mayuka, and Yukari, to him. They are all beautiful and have big breasts. He finally gets beautiful students and....