Leave Me Behind - K.M. Moronova

Set in the brutal world of covert military operations, Leave Me Behind follows Nell Gallows, a woman caught in the path of a violent, secretive unit known as Dark Forces. When she becomes entangled with Bones, a lethal operative shaped by war, loyalty, and control, their connection is forged through captivity, survival, and an attraction neither can escape. As lines blur between protection and possession, love and violence, Nell must confront what it means to give herself to a man who has never been taught how to love without destroying. Dark, intense, and emotionally unforgiving, Leave Me Behind is a military romance rooted in trauma, obsession, and morally gray devotion.
 
Tropes:
Dark Military Romance
Enemies to Lovers
Morally Gray MMC