Dean took a few steps then stopped to turn and look at his little brother. He saw the plea in Sam's eyes, and he actually took a moment to consider what to do. Sam needed to work this alone, maybe, face this demon, but Dean didn't want the big dufus to do things on his own - he didn't want to torture the guy.
"Okay." He reached over and patted Sam's shoulder. "Okay. Com'on." Dean was nice enough to leave out 'ya big baby.' He just motioned for Sam to follow and led the way to the brainy female's apartment.
"You know I think the old mayor lived here. Fred was shacking up with a politician." He laughed softly, trying to lift the mood. Sort of.