Shoujo Kyouiku RE

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Nana Shiraishi couldn't sleep alone tonight because she had watched a horror movie.\r\nShe decided to have her brother, Yoichi, sleep with her there.\r\nTwo people sleeping together in one bed.\r\nNana was hoping that Yoichi would mischief her body.\r\nHowever, despite such expectations, Yoichi was sleeping soundly.\r\nNana was indignant that her brother wouldn't come to see her sister's growth, and she thought she would play a trick on her brother's body.