After their parents die, a devoted older sister continues caring for her reclusive adult younger brother. The adult siblings also share a sexual relationship they can reveal to no one. When he learns she is getting married, the possessive, insatiable virgin brother becomes consumed by jealousy and lashes out. During the days before the wedding, he uses the sister he loves whenever he wants and reduces her to his personal sex pet. Taunting that getting her pregnant would end the engagement, he finishes with repeated breeding presses as she begs him to stop.