Beloved by the Bear by Isadora Montrose

BBW mermaid longs for chance-met bear shifter. Anton Benoit discovers that the magical town of Mystic Bay on the beautiful island of West Haven calls to his inner bear. After one glance at curvy mermaid Serena Merryman, this burly veteran knows his mate hunt is over.
But what are the odds that a rainbow-haired mermaid is a bear’s destined mate? Can he find bliss with an athletic female who can swim rings around his bear? Anton has his work cut out to persuade Serena and her family that they are made for each other.

Serena also feels the sensual tingle between them. But merfolk marry other merfolk. And don’t bears gobble fish and fish people? Moreover, former Marine Anton seems as take-charge as her domineering father. Does she want to risk her life and happiness by cozying up to this muscular shifter?

Serena’s father is the mer-king and his word is law for all the merfolk. He forbids their match. Ever since he banished her older brother, Serena and her sisters have tiptoed around their father. All the merfolk have. In order to win his bride, Anton must restore harmony to Serena’s family and track down her big brother.
Serena’s father has repeatedly tried to find his exiled son. How can Anton succeed where the mer-king has failed? Fortunately, this bear shifter has the can-do spirit he learned in the Marine Corps and honed in Special Forces.

Anton embarks on a magical adventure determined to find the mer-king’s greatest treasure and win the hand of his buxom mermaid.
Along they way to true love, he and Serena are helped and hindered by the usual cast of characters in the quirky town of Mystic Bay, where the paranormal is normal and magic is in the very air.