Taken By the Blood God by C.C. Wood

Minerva
For the last fifteen years, my focus has been on my orphaned niece, Ally.
Now that she’s mated to a gargoyle, I’m not sure how to go back to being alone.
Then again, I’m not alone because I have an arrogant god living with me. That’s right. A god lives with me—one that controls fire and blood.
Talant is bossy, obstinate, and way too sexy for my peace of mind. He needs me to free his brother from a magical prison. I don’t want to do it, but I have no choice. As a Conduit, I’m the only witch capable of breaking the spell…if I can tap into the magic that’s supposedly running through my veins.
Each step toward our goal brings me closer to Talant until I’m unsure if I love him or hate him.

Talant
I have been waiting for Minerva Levine for centuries.
Her magic is strong and cold, her heart is pure, and her spirit is full of fire.
She is everything I wanted or needed but never found.
But Minerva doesn’t know who I once was. Or how her Conduit powers are connected to my past. It’s only a matter of time before she discovers my secret, and it changes everything.
My only option is to make sure she falls in love with me before my past is revealed or I may lose my fated mate forever.