Onaho Kyoushitsu: Joshi Zenin Ninshin Keikaku The Animation: Season 1

At a school where boys are a minority, Ayuchi has been bullied by the girls in his class. One day, he receives a mysterious onahole that allows him to have actual sex with whatever girl he imagines. Making full use of his new tool, he begins a plan to take revenge by impregnating the entire class.