[He doesn't have to. Sam remembers it for him. He remembers the hellhound, but he doesn't remember Cas.]

Congratulations, Sammy my boy. Straight to the head of the class for you.

[His eyes drift back towards the blank space where Lucifer is standing. It takes some effort for him to tear his gaze back to his brother as they start towards the manor again.]

Cas.. he's an angel. He.. he brings you back, Dean. He's a friend, but after the Apocalypse, he kinda got messed up. We all did.

Speak for yourself, I've never felt better.

[Sam really, really didn't like the way that Lucifer was grinning at Dean.]