Eternal Captive. Number 3 in series

Lucian Roman knows he must stay away from Bronwyn Kettler for sanity's sake. Since feeding her his blood, he can think of nothing else but possessing her - fighting an uncontrollable desire to kill her, if need be, and the vampire she has sworn to wed. Bronwyn, a brilliant vampire genealogist, can never escape her connection to Lucian. He sustained her when she was starving. He still rules her dreams.
And when the nights get dark enough, she still craves him, but although his essence still courses through her body, she has found a true mate in someone else. But when a dangerous enemy threatens Bronwyn, only Lucian - bound to her for ever by blood - can save her life. Even if it means sacrificing his own .