The Vampire King's Blood Bride EP 18

Human Elena is rescued from a nighttime attack by Caspian, the vampire king who has ruled for three centuries. Tasting her blood reveals that it is identical to that of his queen, murdered in a coup three hundred years earlier. Bringing Elena to court protects her but violates the ancient ban on human–vampire love. Lucian, descendant of the queen's killer, uses the taboo to mobilize nobles, stage kidnappings, and launch a coup.