In this steamy tale, lovers "Machi" and "Ken" are both very passionate individuals. Machi has a dominant side while Ken leans more towards being submissive (S) and enjoys being dominated (M). Unbeknownst to them, their father Hiroshi overhears strange sounds coming from their room one day and decides to investigate further. What he sees shocks him - his son being pleasured by Machi through anal intercourse! From that moment on, Hiroshi becomes obsessed with Machi. She seems to sense this and teasingly entices her boyfriend's father, eventually leading him down a path of forbidden pleasure when they find themselves alone together... Note that the specific contents may vary depending on the distribution method used.

「まち」と「ケン」は恋人同士。痴女気質で積極的な「まち」と、Mな「ケン」はSとMな関係。何も知らない父親「ヒロシ」はその日、2人の部屋の物音が気になって中の様子を覗き見てしまう。そこで父が目にしたのは、息子が彼女に逆アナルセックスで犯●れる姿だった！それからというもの「まち」のことが気になって仕方がない父「ヒロシ」。そして「まち」はそれを見透かしたように彼氏の父親を誘惑して弄び、彼氏のいない部屋で禁断すぎる快感の虜にさせる…！※ 配信方法によって収録内容が異なる場合があります。