Angel’s Duty by Aimee Robinson

Her touch rekindled his dormant power, yet she wants nothing to do with him. Can he convince her he’s more than the stuff of her nightmares?
Tungsten, leader of the fallen sentinel angels, has one job: restore heaven’s light to its celestial throne and cut down any demon charmers who get in his way. A task made difficult when the very light he’s sworn to protect manifests in the one mortal woman who refuses to even look at him. His very nature reminds her of the abuse she suffered during a demon abduction, but his angel fire cries out for her. It’s a call he’s growing more powerless to resist.
Any day now, Tammy Meyer hopes her life will return to normal. But normal is a pipe dream when her sleepless nights are plagued with terrifying nightmares of torturous demons who still hunt her. For her protection, a fallen angel is assigned as her bodyguard. An angel who claims she’s something more, just like the demons had. But she’ll be damned if she’s bound to another thing ever again.
Tammy refuses to be managed. Especially not by a dangerously strong angel whose constant nearness threatens to break through her indestructible resolve. But the bond between them cannot be denied. When a great enemy resumes the hunt for Tammy and threatens to annihilate the sentinels, Tungsten must convince her to let him in before heaven’s guard, and his heart, is destroyed for good.