Take Me Back by Safiyabat

Take Me Back - Safiyabat
An unusual fanfic in which surgeon Dean is cast as the villain and FBI agent Sam the victim. Well written and full of angst, this fic explores the outcome of the incest that began when Sam was eleven. Dean cannot see past Sam's desertion thirteen years ago to understand the circumstances behind his leaving.
Source: http://archiveofourown.org/works/4241112