SEX's sister, who loves her younger brother, is incest and close friends. She has seen each other naked for the first time in 10 years.

An older sister who is conscious of her younger brother as an opposite sex. "I know it's absolutely impossible, but I can't lie to my feelings..." I suggest taking a bath with my brother and pouring his feelings into the water naked, but each other's excitement has increased. Two people who kiss and hug each other do not stop anymore, but are forbidden to live sex in secret by their parents.