Mesu Kyoushi 3: Inetsu no Gakusha Chisato-hen

Having lost his memories, Tatsuya eventually rediscovers his true nature and rapes his homeroom teacher, Touko. Having discovered the pleasure of violating a woman, Tatsuya sets out to find his next prey. He decides on Chisato, a friendly and popular gym teacher, as his target. He pretends to help her with her work, approaches her, and succeeds in taking her virginity. He then rapes Shino, the school principal, and Kurumi, a school nurse, and imprints the pleasures of sex on their bodies as well…!

(Source: Paradigm Novels, translated)