Dean glances at her hand when she takes his. He doesn't know how to react to any of this, so he just stays still, avoiding her gaze. It'd been a long time since he'd had to think about John, or about the deal, or even about Azazel himself. Though he's mostly buried it, Dean knows John spending all those years in Hell was his fault, and no words were going to change that.

Pause, as Mary tells him that, and Dean still doesn't look up. He knows.

"Yeah. I saw. Long story, but I saw. You made a deal with Yellow Eyes." He sounds exhausted.

"I know. Runs in the family."