Okay hear me out. I read this story -- or 'verse -- years ago. So I can't remember a whole lot.

Sam somehow ends up going back in time and replacing his pre-canon self, I believe. Like, his 20+ year old brain took up residence in his teenage body. He walked out of his high-school class the moment he realized he was old enough to legally do it. It might have been because of the Yellow-Eyed Demon, his traveling. He didn't end up going to Stanford, he kept hunting. He and Dean traveled together and wincest was a Thing -- until Dean met Cassie, as he had in canon.

Sam let Dean go, and let him have his relationship [one line i remember really clearly is something like "that's the thing about dating your brother. Even if we break up, we're still family"], and headed back to his dad by taking the bus. However, as he arrived, John was bitten by some sort of lust-demon and the poison affected him enough that he attacked and overpowered Sam. After, he threw some money at Sam -- go back to your brother -- and bolted, out of guilt. Sam, now very Not Okay, took the money and just -- left?

The next bit I remember, he ended up going to the Roadhouse and went by the name of Jesse. John and Dean were looking for him at this point? He and Ash ended up hunting together. Both ended up with big/elaborate tattoos, and they slept together, but it was a friends-with-benefits type thing.

I'm pretty sure by the end of the 'verse, the YED was dead.

Sory - that's all I remember. I think I found it on LJ, but it might have been on A03. Does this sound familiar to anyone else?