Amazon Heat (Demon Heat Series, Book One) by Valerie Twombly

When Katrina faces the death of her father, she is left with only one choice. Hire a local demon to help her retrieve a mythical healing stone from deep in the Amazon. However, when the two finally meet, sparks fly. The man is a walking sex god and when he offers to pleasure her in exchange for his services, she finds it hard to refuse.

Damis only intended to have a good time with the beautiful blonde who entered his office. Little did he know, the vixen was not only half demon, but his mate, as well. Can he resist the urge to bond with her? Or will his desire be his downfall?