Hayes, Erica. Shadowfae chronicles

To a vampire, nothing is sweeter than bloodfairy essence-and Ember is the most sought-after fairy on the underworld circuit. Selling her blood to the highest bidder-and robbing her clients in the process-Ember has unwittingly become a target of dark and dangerous forces. Her enemies are everywhere. And, if she hopes to survive, she needs protection... Diamond is a glassfairy who, for better or worse, knows his way around the vampire underworld. Smooth as silk, and tougher than trolls, Diamond is Ember's only chance to keep her magical blood inside her body, where it belongs. But, he also poses a threat to Ember, a strange kind of danger she's never experienced before: She's falling in love with him... Blood Cursed is the fourth book in Erica Hayes' thrilling paranormal fantasy series the Shadowfae Chronicles

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