This video is a submission from a man who trains a brother and sister, known as Mari and Yuuta—pseudonyms for the siblings—who repeatedly engage in incest, turning them into his sex slaves. Mari and Yuuta were originally the children of my late sister 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, and shortly after our life as a trio began, I discovered the siblings' incestuous relationship. Though Mari and Yuuta were not biologically related—they were the children of my wife's sister—they engaged not only in disturbing incest but also in extreme masochistic behaviors, tormenting each other. Upon learning their secret, my sadistic instincts whispered: 'Make them happy. Mari and Yuuta are perverted masochists, just like ×× (my wife's name).' 'These siblings are deeply twisted Ms who fuck like animals. Everyone in ××'s bloodline is born to be a slave.' 'You must dominate these two masochists and lead them to happiness.' This video was sent along with such a confessional letter. Enjoy the sight of these incest-obsessed siblings becoming slaves to their uncle.