After a long time, Kouda visited his childhood friend Aikawa's house. By chance, he witnessed Aikawa's mother, Sakai, masturbating. He had always admired her, but never expected she could be so erotic... The alluring scene captivated him, and he aimed his phone at her. As soon as he pressed the shutter button, a dark desire began to sprout within him. Maybe if he showed her the photo, she would let him have his way with her...

久しぶりに幼馴染みの相河の家に遊びに来た康太はひょんなことから相河の母、沙季のオナニーを目撃する。昔から憧れていた沙季さんがこんなにエロい人だったなんて…。あまりにも妖艶な光景に魅了された康太はスマホを沙季に向ける。そしてシャッターを押した瞬間、自分の中でドス黒い欲望が芽生えてくるのを感じていた。この写真を見せて迫れば沙季さん、ヤラせてくれるかも…。