Kanojo no Imouto wa JK-chan
彼女の妹はJKちゃん
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66
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-Description
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)