Citations:vampcest

Noun: "(fandom slang) incest between vampires"

 * 2013, David Blend, "On HBO's True Blood, incest isn't best", Thrillist, 30 June 2013:
 * By contrast, the vampcest between Eric and his sister Nora might be tempestuous, but it's also portrayed as hot, not demented, one of the few incestuous TV relationships that hasn't come with (so far) serious repercussions.
 * 2014, Maria Lindgren Leavenworth & Malin Isaksson, Fanged Fan Fiction: Variations on Twilight, True Blood and The Vampire Diaries, page 141:
 * Katherine's vampire attitude to human morals makes it relatively easy for both canon producers and fanfic authors to envision scenarios where she can indeed have both brothers, and stories like What Falls Away subvert the canon only in making the erotic tension play out in graphic ways and in putting emphasis on the homoerotic vampcest.