Warrior's Blood. The Collective Series, #1

Kristen Baracas has survived a great many things in her life. The death of her parents, being turned into a slave by the clan who took their lives, dealing with her brother's blood addiction problems, and surviving the induction programme for the Real Defence Network. Now she simply rolls with the punches. As a vampire, it's her duty to protect the human race. She has access to a superior blood bank, that being her feeding buddy and partner in crime Carlisle.
Even better, she gets paid to rid the mortal realm of demon scum. Life is a party, and she serves up the heads of her enemies. So what if there's a war going on? She can deal with anything. Well, except for crossing paths with a battle angel. Joshua is a member of the Battalion; a warrior sent to the mortal realm to serve and protect. He didn't expect to fall for a vampire with a chip on her shoulder, one who sets his blood on fire, even when she doesn't have her fangs buried in his throat.
The pair must join forces to defend a safe zone under attack, while dealing with an attraction that might just be hazardous to their health.