Sworn to Consume (Sworn Series #3) by Dor Friedman
 
"Touch me, and you’ll learn why they fear my bloodline.”
 
Malec
I was raised to command oceans without letting them swallow me.
To lead without flinching. To feel without breaking.
Born of ancient, untamed magic, I was meant to rule the mafia above and contain the merfolk below.
But control is a fragile thing—and I’m starving.
Merfolk are vanishing. Power is shifting. And the only leverage I have is Roran Morozova, the hidden daughter of our enemies.
I’m supposed to use her.
Instead, I’m unraveling for her.
Her soul pulls at the storm inside me, and if she touches me…
It won’t just destroy me.
It’ll destroy everything.
Roran
I was raised in shadows. Trained to smile while bleeding.
My father’s secret daughter. His hostage. His shame.
To save my sister, I took her place in a marriage meant to kill me.
I thought I was prepared.
Then Maleciandro Spallo walked in—all storms, scars, and secrets I know better than to want.
He’s not part of the plan.
But the way he looks at me… It’s not fear. It’s not pity. It’s something deeper.
Like I’m not a weapon or a weakness, but the start of his undoing.
And maybe mine too.

Book 3, Part 1 in the Sworn Series. Must read after Sworn to My Heart and Sworn to Revenge.
The magic, mermaids, and mafia collide again in a world where loyalties shift like tides, every wave carries a warning, and love can be the most dangerous weapon of all. Some vows are forged, some debts are hunted, and some souls will consume you before they’re claimed.