Mujikaku na Osananajimi to Kyoumi Honi de Yatte Mitara 2

A secret relationship that started purely out of curiosity with his childhood friend Meiko. Hiroki becomes completely addicted to sex. Before long, he is hooked on the thrill of secretly doing it at school as well, stealing hidden moments whenever they can. As they keep fucking again and again, subtle changes begin to appear in Meiko too. But Hiroki is so drunk on his sense of superiority over his classmates, who can only fantasize about sex, that he stops seeing anything else around him...