A beautiful girl who could rival an idol transforms into a lewd and vulgar little sister! Kana-chan has become an over-sensitive, quick-cumming type on her ovulation day! Unable to stop her love for her big brother, she masturbates vulgarly! She seduces her big brother and goes straight for a raw creampie! She repeatedly uses dirty talk to tempt him! Her "cumming" state in cute pajamas is a must-see! A close-up, lovey-dovey story!