Finding Grace (слэш)

After months of a lonely, desperate Sam Winchester confiding his troubles to him through the door of the cage, Lucifer breaks out to find his vessel. Wanting a break from his old life, Sam leaves with the only creature that's ever fully understood him, but still, he wants something more from Lucifer. And maybe he and Lucifer can teach each other something, too.
Samifer. Mid-season 9.