【逢沢みゆ＆彩月七緒、最旬No.1コンビが義父の餌食に…。】面倒見がよく家事もこなす姉・みゆと、無邪気だが人を信じやすい性格の妹・なお。2人は母の再婚相手であり資産家の義父と何不自由なく暮らしていた。しかしそんな平穏は長くも続かない…。地下室に行ったが最後…、義父の態度は急変し色欲を剥き出しにして姉妹に迫る。流されやすい妹はセックスへ誘導。気丈な姉は拘束し無理やり種付け。性格の違いを利用して操り心もカラダも支配していく。いつしか2人は性奉仕を競い合うメス奴●になっていた。「私たちの価値は義父の孕み袋になることしかない、私が先に、先に…！」そんな事しか頭に思い浮かばないほど洗脳されて…。

[Miyu Aizawa & Nanao Ayatsuki, the hottest No. 1 duo, fall prey to their stepfather…] Miyu, the caring older sister who handles household chores, and Nao, the innocent but trusting younger sister, lived comfortably with their wealthy stepfather, their mother's new husband. However, this peace did not last long… Once they went to the basement, their stepfather's attitude changed drastically, and he began to pressure the sisters with his lust. The easily swayed younger sister was led into sex. The strong-willed older sister was restrained and forcibly impregnated. He manipulated them by taking advantage of their differences in personality, dominating both their minds and bodies. Before long, the two had become female slaves competing to provide sexual services. "Our only value is being our stepfather's breeding sacks, I must go first, first…!" They were so brainwashed that they could only think of such things…