Sisters Eimi and Ai care for their sick mother. A year ago, their mother remarried, bringing a new stepfather into their lives. Wealthy and kind, he provided the sisters with a comfortable lifestyle. But one day, when their mother was hospitalized, his demeanor changed. To Eimi, he threatened that if she refused sex, he would harm her younger sister, forcing creampie after creampie. To Ai, he coldly declared, "Since your sister exists, I don't need you," and demanded she perform blowjobs. Powerless to resist, the sisters submit to his demands—desperately sucking his cock, engaging in sex with their young bodies, as he gradually takes control of their minds and bodies.