To think about it, the layers of incest is insane in VK and VKM.
⋆ Haruka and Juuri, each other's full-blooded siblings, in love with each other and married.
⋆ Rido in love with his sister, Juri, to the point of obsession.
⋆ Rido lusting after his own niece, Yuki, because she reminds him of Juuri, his sister.
⋆ Kaname, the Kuran ancestor, in love with Yuki, his descendant and foster sister, and vice versa.
⋆ Zero in love with and married to Yuki, his adopted sister, and vice versa.
⋆ Ai, Kaname and Yuki's biological daughter, in love with Zero, her step-father.
⋆ Ai in love with her half-sister Ren, who is Zero and Yuki's biological daughter, and vice versa.
⋆ Akatsuki and Ruka, who are second cousins, in love with and married to each other (compared to the rest, it's not that bad).
[I know that they are beasts and all and not humans, but this amount of incest is insane, lol].