Written for comment_fic on livejournal (a multi-fandom prompt fic community)
The prompt was for movie-quote-inspired day, and this was the prompt: SPN, Sam/Dean, "People worry about kids playing with guns, or watching violent videos, that some sort of culture of violence will take them over. Nobody worries about kids listening to thousands, literally thousands of songs about heartbreak, rejection, pain, misery and loss." (High Fidelity)
When Sam turned eighteen, right after his birthday party in fact, he made his move. And Dean was impressed with his guts. He was impressed by Sammy in a lot of ways, in fact. But he did the dutiful thing and gently turned him down.
He did the same thing the next time Sam tried, and the next time too. But once Sammy got smart enough to kiss Dean in the middle of a hunt, right after killing the beast, right before John showed up to bark some more orders, Dean found he no longer had the power to resist. With the adrenaline pumping and the near-escape and hell, let's admit it, with the guns and the violence, Dean's passion far outweighed his self-control. So he kissed back. And later that night, it was more than kissing.
And Dean and Sam were happy and together. Briefly. But the next day, Dean came to his senses. He told Sam that it would never happen again. And Dean was expecting outrage or argument, but Sam simply sighed and nodded and put a CD in his player and asked to be left alone.
For the next several days, Sammy listened to the worst crap music Dean had ever heard. Some boy band saying "How could you leave me girl?" and some chick singing about how she will never stop loving the same damn guy. Song after song about misery and loss and rejection, Sam locked alone in his room doing who knows what. Dean would have felt guilty, but surely the music itself was sufficient revenge. And it's not like he had a choice.
Several months llater, though, Dean wished he had taken that damn music more seriously.
Because he asked Sam, "When the hell did you find time to apply to Stanford?" and Sam had evaded the question suspiciously. So Dean looked at their deadlines on their website, and realized it was during the Great EmoSammy WallowFest last fall.
Dean didn't get a chance to say much to Sam before he left. John's yelling took up most of the air. But part of Dean always blamed himself for letting Sammy listen to that music.
Fucking bad influence, Dean thought. From now on it's Metallica and AC/DC all the way.