Brimstone Series by Barbara J. Hancock

Stranger, Seductress or His Salvation?  One hundred years ago, Adam Turov, master of Nightingale Vineyards, bartered his soul for freedom from the Order of Samuel and their Rogue daemon allies. But he didn't know true damnation until Victoria D'Arcy crossed the billionaire vintner's threshold… Sworn to protect her, Adam must resist with every fiber of his being a voice that sounds like an angel singing and her potent charm... moreStranger, Seductress or His Salvation?  One hundred years ago, Adam Turov, master of Nightingale Vineyards, bartered his soul for freedom from the Order of Samuel and their Rogue daemon allies. But he didn't know true damnation until Victoria D'Arcy crossed the billionaire vintner's threshold… Sworn to protect her, Adam must resist with every fiber of his being a voice that sounds like an angel singing and her potent charm.  An unwilling pawn of the Order, Victoria must betray Adam to save her young son. Yet the more time she spends at his estate on her clandestine mission, the harder it becomes to deny the Brimstone heat scorching a path of desire between them… less