Say It’s Forever by Lucy Darling

He retired from being a hero. Until an angel showed up needing one.

Winter
My whole life has been a secret. I’ve been hidden away from the rest of the world. If that wasn’t bad enough, now I’ve been promised to a terrible man. I have to find a way out for myself and my sister. Even if it means dying, I have to try. The world needs to know about this place, about what goes on here, and maybe, just maybe, that will be enough to save us.

Garrett
I enjoy my quiet recluse life. No more missions, no more working tirelessly for the greater good. That was until she showed up on my doorstep in the middle of a snowstorm. An angel, one I could’ve never expected. She’s everything I’m not, a treasure to be protected. If anyone comes for her, they’ll have to go through me, and I won’t leave any survivors.

Because in the end she will be mine.