It doesn't take a genius to read him- Cas tenses, and Dean feels his stomach drop to his feet, leaving him shaky, staring at the man like he's waiting for a bomb to drop, and truthfully, that's just what happens.

"He's--"

No. No, no, he can't be. Sam had died, and Dean had done his best to try and get him out again, but that wasn't-- he couldn't find him, which had to have meant he was in Heaven. That's the only way to explain it, because Sammy didn't deserve it, not after everything happened, not after how much they lost.

Dean drops his hands, and shakes his head. "Sam wouldn't do that."