In the Depths by Tara Eldana

Becca Paxton spends her days trying to cover news and write stories for a newspaper on Hawaii's Garden Island to please her bitchy editor. She spends her nights asleep in the arms of a dream lover with sandy brown hair, turquoise eyes, and a toned surfer’s body who takes her to sexual heights she never knew existed. Problem is Ethan is a merman who knows Becca’s destiny lies with him under the sea, and she’s afraid of vast expanses of water. He’s wanted her and waited for her since he first glimpsed her in the crystals many earth years ago. Can he convince her she really is a sea form, as he is, and he is really the man of her dreams? And can she leave her life on land and the parents she loves to be with him in a strange world?