Dean licked his lower lip. He was careful not to look Molly in the eyes, but he really didn't like this, and she needed to know that it was as much about her messing around in Sam's head as it was about what she might see in his.
"Not a good idea," he said. "If you and Sam are friends, or whatever, that's great. But the things that kid has in his head are..." Dean shook his head. "Don't do that to yourself. Or to him. You saw what happened with me and Harry."
It wasn't a yell, it was a pretty simple presentation of facts. He didn't like the idea of Molly and Sam sharing their scars and war stories. Sam was NOT okay. And he had a feeling that Molly really wasn't, either.
"The stuff me and Sam carry around with us, I wouldn't wish that on anybody. Anybody."