スレンダー美乳のキュートなお姉さん、望月しおんちゃん。妹の結婚前提に付き合っている彼氏と初対面！イケメンで、自分のタイプでもあり、妹の彼氏とはわかっているが欲しくなってしまい、誘惑！！妹の見ていないところで内緒でセックスまでしてしまう、悪いお姉さん！バレるかバレないかのギリギリのスリルが2人の気持ちを高め、そのまま中出し！至近距離に彼女がいるとわかっているが、性欲モンスターと化した望月しおんちゃんのエッチなカラダに男だったら誰でも理性崩壊間違いなし！ Google Translate: Shion Mochizuki is a cute, slender woman with beautiful breasts. She meets her younger sister's boyfriend for the first time, with the intention of marrying him! He's handsome and her type, and although she knows he's her sister's boyfriend, she can't help but want him and seduces him! She's such a naughty older sister that she even has sex with him in secret, when her younger sister isn't looking! The thrill of knowing they might or might not get caught gets them both excited, and they end up cumming inside! She knows that Shion Mochizuki has a girlfriend nearby, but her sexy body has turned her into a sex-crazed monster, and any man would lose their minds in the process!