Sado Imouto no Iinari Ningyou ni Sareru Boku "Sonna Me de Semeraretara Mou Gaman Dekinai Yo!"

At the school I've taken a teaching job, I have a female student. her name is Mai. She's the kind of girl who's got a little frame but some huge breasts, and she's got a complex about it, making it hard for her to communicate with others. But I found out her true nature one day when we were alone together. It turns out she is a monopolizing sadistic sex freak! And her temper just turned on me... [Taken from English DLsite]