Grow Some Gills by Savannah Verte

Sturgeon Barrow is a stubborn Mer with a wild side he doesn’t control. Defiant and difficult, he nearly flees before getting the chance to meet the one meant to tame him. Leave it to Gerri to plant a seed so tempting, he can’t bring himself to resist.
Nera Daren knows who her destined mate is, a Mer with a playboy reputation. She’d had no regrets when she chose to return solo to the black waters without meeting him, but can she stay there? Whispers in the dark shed light on mischief afloat in the waters above her world, forcing her to realize she might care after all.

The water realms hang on the precipice of destruction as inhabitants are mysteriously disappearing. Is there time to come together to consummate their bond, or will it have to wait?
Gerri’s timing is never off…or is it?