A Vampire's Claim by Joey W Hill
The daughter of two vampires, Lady Daniela is considered aristocracy in the vampire world. Still, she has to fight for what she wants-especially since what she wants is to depose a brutal territory overlord. For that she'll need the help of Devlin, a handsome, brave human who inflames her desire far more than any man or beast.
Even though she could easily lay her claim and take Dev on as a fully marked servant, she resists the urge-especially since Dev is still tormented by something in his past. But when her enemy makes an unexpected appearance, Dev surprises them both by yielding completely to his feelings for Danny and showing her the devotion of a true servant-until she decides to take his freedom without asking...