Kept to Kill by Kyra Alessy

Lily has been alone for most of her life. Held as a captive. Used as a weapon.

The mercenaries who ‘rescue’ her are as intriguing as they are brutal, but Lily is still a pawn in the games of men. They’ll use her and cast her aside if she lets them. That’s if she survives what comes next…
Quin, Commander of the Dark Army, has only one goal and will let Lily die if it serves his purposes, but he’s also drawn to her in a way that makes him wish for more. No one is safe from Mad Mal, a monster who kills to satisfy dark needs. He will make her pay for tempting the other beast he hides within. And the playful Bastian seems harmless, with a taste for wine and women, but he might just harbor the darkest soul of them all…and the darkest secrets.
Each man has his own twisted torments and fierce desires that Lily cannot fathom after her years a captive. But as the days and nights go by, she begins to realize she needs something she never thought she’d have and it may not be the freedom she always yearned for at all.
Can she unlock the hearts of these men who care for nothing and no one to find the pieces of themselves they buried long ago, or will they decide their mission is more important than the woman who brings them to their knees?