～Feeling Good With Your Little Sister, Onii-Chan You're Pervert～

Suzushiro Ryou works as a teacher in an all-girls school. - Saori, Ryou's little sister is famous for being the perfect honor student, or so that is what everyone thinks. - But, Ryou knows Saori's true hidden face very well. - Every time something happens to put her in a bad mood, she teases Ryou, forcing him to do all kind of sexual acts. - One day, Ryou receives a love confession by a fellow female teacher. - Saori overhears this and since then, the teasing and sexual acts begin to escalate further and further. - "I won't hand over Onii-chan to that woman" Saori says.​