Read Uso-Bitch Senpai Manga:
When a city boy, Kinuta Jun, transfers to a school out in the country side, an older girl starts following him around. This is Mizobuchi Chinana-senpai, a self-proclaimed slut who wears a revealing school uniform and doesn't shy away from dirty jokes. However, sempai is a fake slut, whose lack of knowledge and experience is plain to see.