Midwinter Night’s Prince by May Sage

Seth Stomhale is a monster. A demi-god issued of a royal vampiric line, he wields more power in his fingertips than most can dream of. And none of it can save him from Aveka Primerius.

Enslaved by one of the strongest witches on Earth to protect his family, he’s retained one thread to the outside world.
Her.
Blair was born to be head of the Salem coven, before they realized she was useless. Weak. No one believed in her before Seth.
On the run since he trusted her to protect his soul, she’s alone, battling countless hunters on her trail, hiding from friends and foes alike.
If anyone catches her, the queen could be able to turn Seth into one of her mindless acolytes and bring the world to its knees.
She has to secure Seth’s soul. Even at the cost of her own.