Sure as Shooting by Layla Wolfe

They’ll always have Yosemite.

California, 1851. The Sierras are ruled by a band of marauding Indians, and Major Huntley Ashbury is determined to corral them. Huntley’s solitary existence as the biggest trader in the foothills is destroyed when he runs into Whitman Whitney, a half-breed physician with a talented knack for curing hysterical women—and men. Together they rein in the most savage barbarian of them all. Belle Pennington emerges from the forest with nothing left to lose but her Chinese book that tells stories of racy encounters.
As Huntley and Whit clash impressing Belle with their skills, their Battalion ventures into the wild to discover the Indian’s stronghold. Whit has only known the touch of men before, and his peculiar medical expertise astonishes and unites the three in their journey. But it is Belle’s restless spirit the men must conquer in the deep grassy valley of the Yosemite.