遙是一位疼愛弟弟的姊姊。然而，有一天，弟弟突然當著家人的面反复說“我們做愛吧！”，令家人大吃一驚。遙感到不安，便開始調查原因，結果發現這似乎是因為弟弟的男友和他們的母親發生了關係。得知弟弟對性毫無概念後，遙決定向他灌輸正確的性知識…
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