The avengers know about fanfiction, and there is a discussion about the pairings. I think I remember Clint being happy about being in one of the most popular pairings (Clint/Coulson)
2a.) General search:
Any fics where one of the team members are split into multiple versions of themselves, maybe by magic? LIke a good Tony and an evil Tony are running around?
2b.)Or maybe there is another AU version running around in there universe and they meet up.