There's a very good story in which Gus doesn't exist by Eileen Donovan, "Stranded". Brian and Justin are about the same age as canon, but their background is quite different. Basically, Brian is a writer living as a recluse in Oregon and will meet Justin who ran away from home. You can find it on AO3 but its access' restricted, you have to be registered in AO3 to be able to read it:
http://archiveofourown.org/works/7140002/chapters/16212710