"Cas, come on. It isn't that hard," Derek tells him as he beads back towards the sofa. "If I'm in the costume, or you're talking about something I did while in the costume, then don't call me Derek. If I'm not in the costume, then Derek is fine."

He flops down onto the sofa and then looks up at Castiel with a raised brow. "Wait, are we hunting something? What needs hunting?"