Yeah, in my head this is somewhere in Seasons 1 or 2, because there's no "Dean's Death" looming in Sam's little internal monologue. But still. Dean's so jazzed by the kids, I can't see Sam wanting to bring him down with the resolution of the case.

Or possibly it's sometime in the sunny future where they're both alive and back and just...hunting. No major bad guys; no vendettas; no deals. Just brothers and out in the world being Big Damn Heroes.

But I'm glad you liked it. Just a little fluff.