Book XIV of the Vampire Queen Series
(While this title can stand alone, recommend first two books of series or one of the earlier standalones, like Beloved Vampire, to gain familiarity with the Vampire Queen world)
Loss left them only rage...Until they found each other…
Cai doesn't want to be with anyone. He doesn't want a damn servant, he doesn't want to be associated with damn vampires. Rand just wants to forget his human side, stay in his wolf form and find a satisfying and hopefully violent, bloody way to bring it all to an end.
But when a young female vampire's life is at stake, the Vampire Council drafts Cai to enter a dark world he never wanted to visit again. Rand is too honorable to let him go alone, and the only way that can work is if he's Cai's fully marked servant, bound to the vampire for all eternity.
So fate decides these two lost souls need each other. Even if they have to tear each other apart to figure it out.