Mesu Kyoushi: Injoku no Kyoushitsu

A revenge-driven adult visual novel set in a high school where the protagonist, Takuya, discovers his stepbrother Eiji working as a teacher. After witnessing Eiji meeting secretly with Miyuki, a female teacher, Takuya plots to seduce her as payback, enlisting the help of Rihoko, the school doctor. The game features adult content including sexual coercion and corruption themes, with a unique mechanic where the protagonist's semen induces physical transformations in targets. Fully voiced in Japanese with English machine translation.