Master (with a giveaway)
Master: An Erotic Novel of the Count of Monte Cristo by Colette Gale
From the back:
Edmond Dantès spent years imprisoned for a crime he did not commit. Once free, he returns to Paris in the guise of the powerful Count of Monte Cristo, seeking vengeance on those who sent him to jail. But his plan also includes a different king of revenge—on the woman he has never forgotten, the lover he has made it his mission to possess.
Mercédès Herrera Mondego was devastated when the man she loved disappeared. Now she is trapped in a loveless marriage, but her passions are reignited by Edmond's return. She realizes soon enough that his plan to avenge himself on the men who incarcerated him also includes another sort of revenge—on her.
From the seaside town of Marseille to the exotic caves of Monte Cristo Isle, an erotic battle of wills unfolds in the most electrifying game of love ever played between man and woman, between master...