Orc’s Gallows by Milly Taiden

Ismerie is a death witch surviving in the slums by feeding on the leftover magic from executions. When she intervenes to save an executioner, she becomes marked by his primal magic and bound to Brannok, an alpha orc who was supposed to be her killer. Brannok is a hardened executioner who has learned not to show mercy, but Ismerie awakens feelings he thought he had lost. As an ancient horror begins rising beneath the execution scaffold and mysteriously calls Ismerie its sister, the pair become caught in a dangerous supernatural conflict. Their growing bond forces Brannok to choose between his deadly duty and protecting the woman he has come to love.