Futanari Fukushuu Ryoujokuki ~Takabisha Ojou-sama ni Hayashite Odose~

Takemuchi Monako is a timid and cowardly girl, bullied by the queen of all school bullies, Fujimori Misaki.

Hers was a life of unreasonable ill-treatment without end until she, having lost everything dear to her, obtained a mysterious medicine which opened the way to an anything-goes revenge session of coercion, brutal sex, and kinky passion!

[From DLSite English]