Angel's Pain. Wings In the Night, #12

Wings in the NightYour next vampire romance obsession Blood and VengeanceThe first sustains Briar's life, the second gives it meaning. But in her pursuit of Gregor, the vampire she's determined to kill, Briar falls in with a gang of do-gooders who are after him, too. Their reluctant leader, Reaper, the vampire hitman with the heart of gold, keeps trying to see good in her. She keeps telling him he's mistaken.
There isn't any. Briar tells herself that Reaper and his gang of misfit vamps mean nothing to her, that she'll be gone as soon as she's achieved her goal and watched Gregor die slowly for all he did to her. Even after repeated, mind-blowing sex with Reaper, she insists there are no feelings involved. And when she has to share blood with the odd little vampire Crisa to save her life-- an act that always creates a powerful bond between undead beings--she still denies caring. But when their lives are on the line, Briar finds herself risking her own ass to save them. Also, she learns to love stilettos.