My Dark Lord

Fey Monroe was a sixteen year old girl, the daughter of a famous seamstress and the Palace blacksmith, with platnum blond hair and pale blue eyes and flawless skin. But her life all changed when she met Lord Leo, a strange man that tells her his dark secret. When something happens to Fey, he makes a choice to break a promise and makes her have the same dark secret as him. Now, she protects her dark Lord with her life and a special sword her father made her right before he and her mother died from an attack of the same people after her dark Lord.
That was back in midevil times, it's now present day America. Lord Leo is now Mr. Leo VanMark, billionaire who travels the country with his sixteen year old neice, Fey Monroe, who's parents are long dead. She still doesn't remember much of her human life before she meet Lord Leo, only that she swore she'd protect him above all else, even if it means losing her life.