Back to the Beginning by A. Winchester

Before they were a team…

Fresh out of prison, Grayson Harper has one goal in life: hit the road and fight demons. With the windows down and the music up, he lives life one demon hunt at a time. It’s easy and simple, just the way he likes it.
While taking a break in Seattle, he finds himself wrapped up in the mysteries of a man named Ryder. Between secret rendezvous and late-night conversations, the two form a bond that’s hard to deny. As Ryder’s past unfolds, Gray has a choice to make: risk it all for a man he doesn’t know or walk away before he gets hurt.
…they had to find each other