My step-sister Mami, who became my sister through my parents' remarriage, is an incredibly beautiful girl but also unbelievably spoiled. When she notices that I can't take my eyes off her cute little ass peeking out of her skirt, she decides to tease me even more. From then on, she constantly indulges in her whims and desires, making sure I satisfy all of them by giving her nonstop orgasms.

親の再婚で出来た思春期の妹まみは美少女だけど信じられないくらい我儘。そんな妹まみのプリ尻パンチラに見とれてしまっているのがバレてしまう。その日以来エッチに興味津々なまみに誘惑されて我儘やりたい放題発射させられまくり。