Cast from the Dark by Asher D Payne:
 
She was never meant to escape.
 
Before Caspian Vayne, the notorious Captain of the Bloodmarked, purchases her for his crew's entertainment, Rohen Levitte is an elite assassin. Always unwillingly chained to another man, she finds herself craving freedom, something the open sea gives her a taste of. Folding herself into the incapable woman she wants them to believe she is, a dark and stormy night grants her the opportunity to escape into the hands of Caspian’s ex-best friend, Alastair Seridean, the Captain of the rival crew, Scarlet Tempest.
 
Caspian Vayne, a man purchased from the underground markets and trained by the corrupt king, barely grasps the reins of freedom. Branded by the Royal Crest, his damned past litters his skin along with the scars he’s earned. Carrying knowledge he cannot share, he is not unfamiliar with betrayal, but the night Rohen Levitte slaughters half of his crew, a newfound hatred blooms. As the hunt continues for the legendary Eyes of Ellira—a Damned goddess who once commanded the sea—and the power they hold, the two destined by fate clash as deceit pollutes the veins of the Capital. While the humans battle for power, the Damned, gods who fell in love with humans and were cast out, and the Others, sinister beings who divided divinity in two, are at war for control.
 
Will Rohen and Caspian uncover their lineage before it is too late? One thing is certain. The sea will remember her. And Caspian Vayne will regret the day he ever touched a blade of the king.