Every male in japan suffers from ED but our MC one morning discovered his cock can get erect, the rumor spreads and so the teacher (Yukari Saotome, from the first chapter) makes a move, after that the PE teacher, Hibiki Oozora blackmails the MC with the footage (lol) and they start going at it, it turns out the teacher really falls for the MC and is willing to do everything for him even inviting him home for some lovey dovey impregnation sex