I know that. I know. But would you've reacted any differently if I told you?

[ Sam's heart tells him "no". Which is a big part of why he didn't share in the first place. The guilty conscience knew he'd get in trouble, knew Dean and everyone else would disapprove no matter what, and he didn't want that. Selfishly, he thought he could do it all on his own. ]

Don't you get it? I know they're lies. Nothing he can say or do will make me want to create a future like the one you're from, Dean.

[ He won't admit to the vain hope that Sam has that he's actually getting through to the devil. That would be one step too far for this Dean, for any Dean. Reasoning with Lucifer? Who does that? Sam didn't even think it was possible until Lucifer admitted to spending time pondering Sam's question of God's motivations. Asking Michael? It honestly bothered him enough to do it. To Sam, that says a lot.

Which is why he says nothing. ]

We have a deal; three questions and I get to name whoever I want and he doesn't get to lay a hand on them.

[ He omits the drunken promise he made about assuring to see Lucifer on a regular basis. ]