The First Knight by Delilah Devlin

While hiding her true identity, Maddie must seduce the mysterious Lord Garon to cement their marriage contract and ensure she won’t be returned into her lecherous stepfather’s care.
Fresh from Crusade in Palestine, Lord Garon has a secret he must hide, a hunger that must be fed, and a dark and uncertain future. Having shed himself of a fiancée he’d never met, he’s home to lick his wounds. The only thing he wants is a warm-blooded meal—but the new housekeeper is strangely insistent on giving him so much more.
Maddie’s seduction doesn’t progress without complications, but one secret from her own past might put an end to the love she nurtures for her dark, tempestuous lover.