Adult PC Game: Oppai Kaijuu Akanegon ~Katei Kyoushi wa do S Chijo~ by Mocking Soft Archive

My name is Kimura. Last year, I was called up in a self-examination examination, although I am currently being penalized for failure. I'm a guy, my busty sister lives next door making love with classmates, she likes it. I said that to her and smiled ...