Jimikko Muchimuchi Iinchou to Dosukebe Choukyou Seikatsu

Hino Kazuma is normal student with otaku hobby. He never paid attention to the plain looking class president Shiori whose seat is next to him in class. However, everything changed when he discovered she was masturbating in empty classroom using his eromanga. After using that to blackmail and rape her he found out she is actually a masochist pervert. He then decided to train her to become his exclusive plaything.