The specific story I'm looking for is pre-series and involves one of the boys being molested. Bobby and Jim are discussing how to handle it (John is off on a hunt/unreachable). Bobby says he won't kill the guy, but he figures what the pastor doesn't know won't hurt him.

I'm almost certain I found it through someone else's search here . . .but I have no idea which one.

In general, any fics where one character takes the law into their own hands in defense of another are welcome! Gen only, please.

ETA: Specific story found, with link in comments. Recs for the general search still more than welcome!