Supernatural: Dean/Sam.
I am totally obsessed with stories that get into the circumstances around Sam leaving for college, and while I don’t often buy the idea that Dean and Sam ever had sex in the pre-college days, this is the kind of story I can buy it in. A refreshingly original take on the situation that so many fic writers have tackled. Much less about the sex than the relationship, this story is both heartbreaking and powerful enough to leave an imprint.