My Demon of Water by Rosemary A Johns

When I start working for a monstrous demon prince, I never expect my boss to claim me…
I’m only a human servant, who’s trapped in the deadly Merfolk Court. Humans are forbidden from mating with demons. But then, I almost drown, and my life is saved by the mysterious Demon of Water.
He’s dark, dangerous, and sexy-as-hell.
The humans warn me that he’s a monster. The demons forbid me from loving him.
He’s a shifter. A merman. A mesmerizing siren.
Yet I can’t stop sneaking looks at him, yearning to kiss him. His voice sends shivers down my spine. He’s seducing me. And the fact is? He’s hard to resist.
Yet if we give in to our desires, we’ll both be killed.
He didn’t even want a mate, until he met me. Now, he promises me an eternity of love. But then, I discover a secret that could destroy him…