This is alternate 'Supernatural' season 11 following 'The Darkness' covering the country at the end of season 10. Sam has amnesia and Dean feels that he is happier that way. A well-written, intelligent fanfic. No wincest.
“Most people, when they go to heaven, they get their own special heaven. It might seem like there are other people in it but really it’s their version of the perfect place. But we’re like, I dunno, special snowflakes. We share a heaven. We were never really meant to be apart or some shit.”