DEAN Sam, I'm sorry.2x20, in which Dean loves Sam so much the guy he's talking to ISN'T HIS SAM, and he still wants to have a relationship with him, even as he's also planning in the same breath to go find actual Sam. He still wants alter!Sam to be happy, and feels responsible to his happiness. Because even if this isn't his Sam, and he shares nothing at all with this Sam, and this Sam shares almost nothing at all with actual Sam--this is the Sam with law school, with Jess, with Mary. And that makes him like enough. His happiness should be protected. <3
SAM (quietly) Yeah.
DEAN I'm sorry that we don't get along. And I wish to hell I could stay and fix it. But I gotta do this. People’s lives depend on it.
He turns around and take a knife from the box.
[AU where one of the Winchesters' various time-travel, realm-hopping shenanigans goes terribly wrong and Dean ends up stuck in a multiverse loop where he ends up feeling compelled to maintain a once-in-a-lifetime relationship with every single Sam in all of existence. Which is, of course, unsustainable. And actual Sam/Sam Prime is just like, dude, what the fuck, you need to stop this--seriously. But that's easier said than done, because the point of the universe is there is no point, there are no mathematical points--and ergo, no Primes. /dramatic cymbals]
[oh no, I'd actually read the shit out of that]
[o h n o]