He wanted a son and heir .and he was prepared to pay for it.
A contract for seduction:
Cameron Hunter's offer was extraordinary, but his terms were simple: he would possess Nadine, body and soul and the resulting baby would be his. Yet, for Nadine, this could never be a straightforward business arrangement. Cameron was the only man she'd ever loved-and he was now the father of her child. She just couldn't walk away!
Once again, Elizabeth Power "tugs on all our emotions."
-Romantic Times