Kawakami Nanami reunites with her cousin who taught me how to masturbate a long time ago after five years

My cousin I met for the first time in a while had grown up... Five years ago, Nanami, who attends high school, ends up having a relationship with her cousin Teppei. However, he didn't have sex, he just taught Teppei, who doesn't know yet who she was a woman, how to masturbate. Both were just weird at that time. Since then, it has become awkward and Nanami has been away from him for a long time. After that, the two end up meeting again... Her cousin's monkey-like sexual desire drives Nanami's body crazy! Finally, he started to seek it himself...