Hyoudou Ibuki: Kanpeki Ibuki Kaichou ga Kousoku Do M!? na Wake

Based on the erotic game by Grand Cru Noir.

The seemingly strict and disciplined school-council president has a secret. She loves getting roughed up, humiliated and being fucked in the ass. Didn't see that coming? Well, the new teacher that transferred here certainly did. But she isn't gonna report her. She just wants something else in return...