Kanojo no Imouto wa JK-chan

彼女の妹はJKちゃん

An original doujin manga. This is a story about a protagonist who ends up laying a hand on, and going all the way with his (college girl) girlfriend's (high school girl) younger sister, when he only intended to play around with her a little; he quickly becomes hooked on her and finds himself unable to break away. (Source: [DMM](https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_118377/))

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