步美早年喪夫，獨自撫養獨子浩二。他們過著簡單而幸福的生活，但浩二步入青春期後，似乎出現了一些異常。正當她苦思冥想時，她注意到內褲上留下了春夢的痕跡。為了教導愛子正確的性知識，步美開始以自己為教材，教導他性知識。然而，不知不覺中，兒子快速的抽插讓她露出了欣喜若狂的表情…
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