Two-Headed Boy by Dollylux

Two-Headed Boy - Dollylux

4.5 stars. A lengthy beautifully written fanfic charting Sam's life from ages sixteen to twenty-two. I enjoyed the slow build of Sam's angst-ridden teens in which he yearns for his brother Dean, less so the explicit sex scenes at the end (not a big fan of rimming.)
Art by Niightmoves
description
“We’re sleeping, Sammy.” There’s light in Dean’s eyes, a tiny glimmer of humor behind his serious big brother face, behind the tired lines. Dean leans over and flicks off the lamp by the bed, leaving them in muffled streetlight. Sam’s smile softens and he reaches up, hooking an arm around Dean’s neck and tugging him down into the bed, laughing a little when Dean lands with an oof.

Source: http://archiveofourown.org/works/1997235?view_full_work=true