A Demonic, Sadistic Elder Sister Slut Sneers At Me While She Bullies Me And Laughs Cruelly When I Get An Erection. Akari Mitani

Ichiro was being bullied by his older sister's friend, Akari. She would mess with him at every opportunity, but because she was beautiful and he couldn't stand up to her, he just took it. One day, she caught him getting an erection after seeing her panties ride up, and the nature of the bullying began to change.