He's rid himself of the chains both Castiel and Sam had him restrained by, annoyed that it's taken him this long to escape them. Yet as he leaves the room and enters the Bunker's hallways, Dean can only turn his concentration on the sweet scent of a human. You.

He comes up to your room, standing in the doorway just as the red lights and alarm go off, his lips curling into a sinister smirk. "Hey sweetheart, miss me?"