2 Works by Aviss in Supernatural
He left because there was a limit to how much betrayal and heartbreak a person could endure in one place before they lost whatever was left of themselves, and he kind of enjoys being sane and not feral. He left because after getting his power back he couldn’t stand the smell of the place, and Braeden had patted the back of her bike and smiled.
“Hey, I can do with a werewolf by my side,” she had looked him up and down, teasingly, “and not only during hunts. Come with me?”
And Derek had seen no reason not to.
The one where Derek becomes a hunter, makes friends with the Winchesters and finally goes back home.
Even after everything has gone to hell there can be some hope.