Awesome. Cas was rapidly working his way up to a thundering screaming match, at the very least. There was a story that Dean remembered his mom telling him about Jacob, in the Bible. Wrestled an angel, and the angel was overcome.
Dean bet Jacob didn't have a single iota of the anger he did right now. He was going to overcome the shit out of Cas.
Care to tell me whatever it is that you're not telling me?
Dean looked at her, then. And it was like he couldn't look away from her.
"I can't." He shook his head. "It's... I... wa--"
He wanted to. But then he knew that things could happen if he did. What if they had to forget Ellen had ever been here, or what if something happened to her, trying to save them? That'd hurt so much more, if Jo knew who she really was. And if Cas or any other angel tried to mind-wipe Jo, Dean was going to get himself killed trying to stop it.
His eyes were probably approaching pleading. He shook his head again.