A Monster’s Light by Lynnea Lee

Two years ago, my best friend vanished without a trace, and I’ve been looking for her ever since. The terrifying alien warrior before me holds the key to finding her, but I’ll have to give up everything I’ve ever known to help him break out of a high-security prison.
And there’s a catch. It’s spring, and everyone knows the fearsome alien warriors turn into mindless beasts when their rutting season hits.
As we make our daring escape through the wilds of Vokira, dodging every murder bot and robohound our enemies throw our way, I start seeing the brave and hyper-protective Kadrixan in a very different light. It’s too late by the time I realize the biggest danger isn’t to my body but to my heart.
What will happen to us when the rut is over? Will Gnnar return to looking for his fated mate and leave me forever? And will we even make it back to his stronghold alive?