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Big Sister's Real Sex Education Hibiki Otsuki
Hibiki lives with her brother and father.Hibiki, who thinks of her younger brother, warns her father, who is an AV maniac, "What if my brother sees it!"But one day, her brother mistakenly sees her father's AV. He misunderstands that SEX is something scary, and his younger brother cries out to Hibiki.In order to correct her brother's sexual knowledge, Hibiki used her own body to teach her about real SEX.