Pls guys don't be in denial. They are uncle and nephew by blood. Even they don't see each other as relative or never seen each other before, it doesn't change the fact they shared the same blood, same genes. seme is uke's mom younger brother who was disowned by their dad. No matter how much they want to cut ties the blood still flows. Incest is wincest. This is yaoi, if you like, continue. If you dislike, don't change the fact. After all this is the genre.