I remember reading this fic ages ago that I now of course can't find. I am almost positive it is on AO3, as that's where I predominantly read fics, but I could be wrong.

Basically, during Plucky Pennywhistle's, Dean realizes that Sam was sexually abused by one of the guys who worked there, hence his clown phobia. I'm a little hazy on details, but what I do vividly remember is that Dean tracks the guy down and kills him in the basement of an abandoned house, which he then burns down to hide the evidence. I also remember that he's pretending to be a police officer or FBI agent at the time.

I'm also thinking the fic was a Wincest one, but don't quote me on that. It might have just been gen. I do know that it was a oneshot.

If anyone can help me out, I'd be forever grateful! This one is driving me crazy.

(Also, Mods, I hope I got the tags right. Since I can't remember if it's Wincest or not, I didn't use the pairing tag - hope that was okay! I also couldn't find an episode tag for this one, so maybe one can be created? I saw some other searches for fics based off the episode, but not this specific fic.)