Doutei Danshi to Bichiko-chan ~Himitsu no Hame Pako Kagai Jugyou~

This is a story about a guy who is constantly rejected by girls.
One day, he spotted Maya doing compensated dating behind the school building, and accidentally pours his semen on her from the roof he was peeking from. Maya has found out about this and started scolding him, but then he has a realization that since Maya is a well-known slut in school, maybe she can teach him how to be popular with girls. Maya agrees to help him out if he buys her a bag she wants. And so begin Maya's naughty after-school sex lessons to turn the virgin guy into a ladies' man.