the_comfortable_courtesan

She becomes quite an entirely new young woman in New South Wales in the company of the T-s and with congenial work to her hand. Given the shortage of women, especially respectable young women, in the colony, she finds she is much pursued by government officers, free settlers, etc, but eventually settles down with Mr C-, the scientific expedition surgeon, who decides to stay when the rest of the expedition (that still survive) return to England with their findings.

I feel it is entirely possible that they find themselves in an arrangement with the T-s...