Free from the author('s publishing collective) via KDP Select @
Amazon:
Pirate Hunter's Mistress by Lynette Vinet (IIRC someone upthread was collecting her books?), 2nd in her Virginia Brides series of historical romances which she says in the blurb can be read standalone, and was originally published by Zebra in 1991 under the title Passion's Deep Spell.
Marlee Stafford was no fool.
She knew the handsome, arrogant Richard Arden had married her for her money, just as she'd wedded him for his aristocratic name. But Marlee wasn't about to give up all control to the too-confident baron. She would not sign over her inheritance until she'd enticed her handsome, broad-shouldered husband into desiring only her. But when his hungry kisses began to ignite her most intimate desires, Marlee knew she'd made a weighty error, for this mysterious man harbored a dark secret -- and now he was holding her helpless under HIS spell!