高中女生真央被無法生育的姊姊委託代孕。姊姊想要一個與自己血緣相通的孩子，真央決定與姊夫發生性關係。姐夫玩弄著她稚嫩的身軀，真央漸漸感受到了快感。在姐姐出門旅行的某個夜晚，姐夫釋放了他隱藏的變態性慾。真央被綁在一張椅子上，房間內散落著淫穢的SM用品。服下春藥後，真央與姊夫的朋友在3P中被強暴…親情與性慾因「代孕」而交織的亂倫劇第四部！
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