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I'm so horny for my little sister's growing body... - I know I shouldn't, but I can't control my rational mind...
My younger sisters used to say cute things like "When I grow up, I'm going to become my brother's wife," but now they are scorned as creepy and annoying. One of them, Yayoi, still loves me just as much as she used to, and one day she seduces me into having sex with her! I know I can't have sex with Yayoi, but Satsuki sees me doing it...?