Dying for You by Jenny Frame

Victorija Dred, Principe of the Dred clan, is one of the most feared vampires to walk the earth, but since her unwanted blood bond with Daisy, she's slowly losing herself to blood sickness. Her clan is dismayed by her reluctance to order Daisy brought to her. The old Victorija would have used her for her blood without a second thought. However no one knows of the age-old vow holding her back. Daisy MacDougall is struggling to cope with the vampire bite that is urging her to seek out Victorija. Secrets and history bind them in unfathomable ways, and when she discovers her family's past and a very different Victorija, she vows to find the truth even if she must force their meeting. Victorija and Daisy travel a dark and seductive path even as Victorija fights every instinct to take Daisy's blood, and love seems all but impossible. As if that wasn't bad enough, neither expects the real threat to Daisy's life to be hiding inside the Dred clan.