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Sam knows. He knows why Dean didn't say anything. Why he didn't say anything.
"When two hunters make it to the finish line? You leave 'em alone."
Sam is tired. He doesn't let himself think about it very often, but it's there. It's a weight that will eventually drag him under, make him do something stupid because he just can't anymore. He's going to fight it as long as he can, and he's going to do everything in his power not to drag Dean down with him, but he can feel the weight on him.
When is it our turn?