Eternal Vampire by Juniper Hart

A spell that defies all rules could cost Lane and Henry their lives and change the course of history.
Hidden away from the world and the Enchanted for years, Lane Aldwin is finally permitted to take her seat on the Council of Seven, replacing her grandmother: Miriam. Although Lane was born to a long line of powerful witches, she feels she is not the right witch for the job—especially when her mother’s ulterior motives lurk behind Lane’s every thought.
Matters only get more complicated when Miriam’s love spell manifests upon Lane and the Vampire Regent, Henry Brandis. Henry is sure he has found his mate, even if Lane is as uncertain about their relationship as she is about everything else.
Unfortunately for them, happiness cannot be achieved so easily—not with the delusional Julia Aldwin and other players challenging them with plots that would not only endanger Henry and Lane’s love, but their lives as well.