Dean shrugs at Sam the first time - it's been a while since they've dealt with "classic" demons, so he wouldn't be at all surprised, and he doesn't seem to be now. He, too, looks back at Titus - when Sam casts another, weirder glance at him, he's met with a raised eyebrow from Dean, but it's pure and simple puzzlement. It's a weird vibe he's picking up from his brother, not from Titus, and his eyes switch back to the other man to give him his attention but, uncharacteristically, the elder hunter doesn't add anything.

He's glad of the extra details, too, and when Titus finishes up, Dean not only corrects casually - "Brother." - because if that doesn't get out there, people tend to think the wrong things; but he also cocks his head slightly to one side and seeks clarification. "The voice came from somewhere in the room? Like, you heard someone speaking to you?" Beat. "Not inside your head?"

He'd glanced doubtfully to Sam at an act of will - there were only two people Dean had ever met that had been able to overpower being possessed by a demon by sheer act of will, and it had taken far more incentive than stabbing themselves in the hand with a letter opener to do it.