When Cas becomes human after the fall, he doesn't know what to do with it. With this new humanness.
He is praying, desperately. He asks, what do I with this?
Unknown to him, Dean is behind the door and he comes inside, kneels behind him, and says, one hand on his cheek, "you get to loved by me, and feel it too."
He prays silently, Dean still besides him, "okay, okay, I understand now."
He says to Dean, "okay, Dean"
No words were spoken after that.











