I believe it is ATF, there may be a follow-up story as well; it begins with Buck lying on the pavement, having been shot but no one is paying attention to him, they are all clustered around Vin and he thinks the guys are just ignoring him. It especially hurts him that Chris is more concerned about Vin. He feels like he's been lying there forever but it was only a few seconds? Anyway even after he gets better he just feels like an outsider to the group and that his best friend Chris has moved on and JD was almost like a consolation prize? It's driving me crazy. I can't remember the title or author and I'm slowly making my way through the Blackraptor site and the Buck site but I can't find it and I'm not even sure if that's where I read it first. I don't think it was an adult fic or slash. Any help would be appreciated. Thank you. Edited to add *Found* by two wonderful people - The Way of Things series on Blackraptor, see link in comments. Thanks.