Cousin and mischievous younger brother Emiri Suzuhara

Emiri has a secret that her butt is always very sensitive, especially when touched by others, and that secret is known to only one person, her cousin Shota. Because he was so in love with his sister's plump butt, he couldn't control himself and groped them and his sister seemed to like it too so he decided to go big... do it with his cousin!!!