The boys stumble upon a crime
I just read 'Crap Job' by SciFiNutTX where Sam and Dean are filling up the car and are in the store when a guy comes in with a gun to rob it. That led me to reread 'Nobody Loves a Moron' by Clair Beaubien, where Dean walks into a robbery while picking up takeout for dinner. He's amused when the robbers point their guns on him. He tells them his brother is waiting for his dinner but when Sam calls to see what's taking so long, he mentions a case and the robbers think he's an undercover cop. In each story one brother is very protective of his brother, going stone cold when a gun is pointed at him. (Both stories are at FanFiction.Net) I'd like to find any other stories where one brother is angry, cold, and protective of his brother when there's a gun pointed at him and he's threatened. They can be very young and appear innocent and helpless until the kick major butt. Or they can be adults in their full six-foot-plus glory.