At first, I was just helping my brother's masturbation ... My sister who has crossed the line and loved her brother. Her birthday present is "first sex ticket". Her virginity and virginity, the first experience of siblings. However, his younger brother is worried about his relationship with her older sister and tries to go out with a girl who is her classmate. "Drink your sister's pee!" The everyday life of a distorted love between an older sister who loves her younger brother too much and her younger brother.
