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Yu, who graduated from the national literature department, was aiming to become a literature researcher for a while. I married a husband I met while I was in school, and now I have a son who is a school student. I was spending a noisy and peaceful life ... One day, my son brought a friend to hold a study session. While spending time with his young and strong son's friend, Yuu's hidden sadistic personality begins to tingle. Therefore, Yu plans to teach not only school studies but also sexual things.