Entranced By the Nakken by Delilah Dare

Accidentally bitten during the first kissing lesson…they’ll explain the signifcance eventually.
Hopefully their new mate isn’t afraid of tentacles and teeth.

Lately, every song Tsunis plays is sad. No humans fall into a trance at their laments. No bodies sink below the surface.

Without sustenance, Tsunis will never find a portal home. Their homeland finally found peace, and Tsunis would not be there to shed the war from their scales, maybe take a mate and lay eggs. They were a failure.
Beware the fiddle-playing näkki in the falls. Their song brings certain death.

When Casey slinks home from college with nothing to show for himself, his hometown is exactly the same. His mom still dotes on him, his father still yells at the T.V., and the townsfolk still cling to legends of malevolent water spirits in the rapids.
Except Casey knows the spirit isn’t evil. An evil spirit wouldn’t have used their beautiful voice to save him when he was a boy. The mer-child swam off before Casey could show his gratitude.

Maybe it isn’t too late.