Konatsu is a younger sister who has loved her brother too much since she was little. One day while her parents were traveling, her older brother witnessed Konatsu masturbating while shouting "Big brother..." and found out that he was peeking at her. Konatsu lets her touch her big breasts and seduces her, saying, ``You can do whatever you want, okay?'' Her older brother can't resist the temptation of his cute younger sister...
