彼女の家に遊びに行ったとき、彼女の姉・七緒と初めて出会う。おっぱいがヤバい（推定Iカップ！！）…その巨乳を思い出し、ムラムラが止まらず彼女に内緒でメンエスに行くが…そこでまさかの彼女のお姉ちゃんと再会！！「生でハメてあげるから妹に内緒にしてね」と仰天発言で生中出ししてしまう関係に。彼女のお姉ちゃんの巨乳とマンコの虜になってしまい―どっぷりハマってメンエス店に通いつめるようになった…！

When I went to her house to hang out, I met her older sister, Nanao, for the first time. Her breasts were insane (estimated to be an I cup!!)… Remembering those huge breasts, I couldn't control my lust and went to a massage parlor without telling her… and there I unexpectedly reunited with her older sister!! She made the shocking statement, "I'll fuck you raw, but keep it a secret from my sister," and we ended up having unprotected sex. I became captivated by her older sister's huge breasts and pussy—and I became completely addicted, frequenting the massage parlor…!