Miyuki-chan, a beautiful school girl who has a good reputation at school, has a perverted older brother who is a ronin who is peeping at the place where she is masturbating while lurking at home and the place where she brings her boyfriend and has sex. One day, the night my brother sneaks into Miyuki's room and goes on a daily basis ● I failed, and on that day I became my sister's servant and became treated as a butter dog by my sister like a daily routine. It seems that he is being forced to do cunnilingus etc ... This brother has this sister!