Savage Surrender by Colleen Faukner (Historical Romance) Zebra Paperbacks, 1992.
Determination and a will to live were all that kept Lady Rachael Moreover from giving up in the first days after her capture by the Iroquois. She'd never surrender to those savages, no matter what they threatened! But the broad shoulders, jet-black hair and sun-bronzed skin of one strikingly handsome brave attracted her, despite her defiance. And when he saved her from certain death, Rachael knew she must give herself completely to this rugged and untamed man, surrendering to the pulsing heat of his desire and the power of his savage passion...
His people would never understand the futility of continued bloodshed and killing of the white man. But when Storm Dancer saw the tribe's newest captive, with her strong spirit and perfect beauty, he knew she was a white woman like no other. He ached to run his fingers through the tangled curls of her glorious dark hair, to pull her cool white body alongside his, and to feel the sweet softness of her lips beneath his own. Storm Dancer knew of Rachael's strong will, but he also sensed her hidden desire, and he promised to ignite those smouldering flames with his own burning passion as she became his in a SAVAGE SURRENDER