The Time Traveler's Brother by AmyPond45

The Time Traveler's Brother - AmyPond45

An excellent fanfic told from young Dean's pov as he is visited by a succession of time travelling Sams from the future. Intelligently written and voices the Supernatural characters to perfection.

'Dean is struck again by how easily this older version of his brother falls into his role as the younger brother, the child Dean raised. It's Old Sam's comfort zone, his happy place, being Dean's little brother, and somehow that makes Dean so sad he has to stop thinking about it.'

Source: http://archiveofourown.org/works/3416087?view_full_work=true