This work is a submitted video from a man who trains a brother and sister, engaged in repeated incest, as his sex slaves. Mari and Yuuta (both pseudonyms) are the children of my deceased sister-in-law and her husband, who died in an accident. Since my wife and I had no children of our own, we took them in and raised them. My wife was a masochist, and I, a sadist, trained her as my love slave. A few years ago, my wife passed away from illness, leaving just the three of us—Mari, Yuuta, and myself—when one day I discovered their secret. The siblings were not only involved in incest but also engaged in extreme masochistic behavior, tormenting each other. Though they were my late wife's niece and nephew, such a relationship was unacceptable. Yet my sadistic impulses whispered: "Make them happy," "These two are incredibly masochistic siblings meant to entwine intimately," "Everyone in the ●○■★ bloodline is born to be slaves." This video was sent along with that confession. Please enjoy the sight of these siblings, utterly immersed in incestuous desire.