There is a perverted brother who has been lurking at home for a long time, peeping at the beautiful female high school student Miyuki-chan, who is also popular at school, while she masturbates or brings her boyfriend in for some hanky-panky. One day, the brother sneaks into Miyuki-chan's room and fails in his nightly attempt, and from that day on, he becomes her servant, treated like a pet daily, and seems to be forced to perform acts like cunnilingus... This brother has such a sister!
