[He can tell Cas isn't amused.]

I know, I know. I'm just joking.

[Dean sits up and runs a hand through his hair. He knows he owes Cas and Sam for pulling him out of that dark hole. Again.]

I uh, don't know that I thanked you yet, for uh, not letting me kill my own brother. For bringing me back.

[He looks up at Cas. He means it.]

Thank you.