Hidden Heart by Amy Lane

Search-and-rescue worker Spencer Helmsley has everything he needs: a job he loves, a flight partner he’d die for, and an amazing dog.

Then he flings himself out of a helicopter to rescue Theo Wainscott.
Stuck on a raft in the middle of a flood with the most stubborn, argumentative man in the world, Spencer soon finds himself asking not how they’ll survive but what’ll kill them first—the water, each other… or the sexual tension.
While Theo and Spencer are trying to beat the odds, Theo is also trying to beat some sense into his rescuer. Spencer seems to have no regard for his own safety, and that’s a problem for Theo. Maybe he’s never seen another gay man in the wild, but it doesn’t take him long to recognize that he’d like to get to know this one better.

If they make it out alive, Theo will have his work cut out for him convincing Spencer to risk his heart instead of his life….