Blood & Brujas by Mikayla D. Hornedo

From the moment Dayanara could wield a blade, she's been used as a weapon for Caldera, a kingdom of fierce brujas. Whenever her mother, the all-powerful Acna, points her in the direction to kill, Dayanara follows.

After centuries of war against the vampire kingdom at their border, her mother offers their king Dayanara's hand in marriage as a truce. Their agreement is bound by magic, and Dayanara must decide if she wants to kill the king, seduce the king, or embrace the union.

On the bright side, the marriage is set to make her the next Acna, granting her all the power that comes with the role. Depending on how much the Goddess Naom gifts her, it could be enough to regain control of her life. Or maybe everything will crumble beyond repair.