Sam's hand drops to Castiel's lower back and his expression lightens a little bit when he looks to Otis. "I know. And that's not entirely your fault."

Not entirely because Sam knows Castiel. If Otis had actually ASKED, Castiel would have told him. But the fact that he hadn't meant it was at least partly his fault. "Cas and I will be having a discussion about that."

He pressed his hand tighter against Castiel's back, turning him toward the door and staying close as he walked him outside. He went directly to the car, opening the door. "Get in," he said, voice steady but not giving much away.