The placement of the Avengers in Iron Man 3 fanfiction can be all over the place. It could be that they show up to assist Iron Man, or they might be off on their own missions and only mentioned briefly. It all comes down to the imagination of the fanfic writer.
Well, there's a fanfiction called 'Iron Man's Elite Squad'. In this story, Iron Man recruits some lesser - known but extremely talented individuals to form a unique team. It has a great plot that involves them facing off against a new, formidable enemy. Also, 'Team Iron Man: Reborn' is quite interesting as it explores what would happen if Iron Man had to reform his team after a major setback.
Well, Captain America might be a bit shocked at first. He's from a different era and fanfiction's modern concept could be strange to him. Thor would probably find it amusing and might even think it's some sort of Midgardian magic story about his friend Stark. Black Widow would analyze it carefully, looking for any insights it might give into Iron Man's character or the public's perception of him.
Think about their shared goals. In a fanfic set after Iron Man 3, if they are facing a new threat, Iron Man could use his technological expertise to analyze the situation. The other Avengers would listen to him because they know he's smart, but they might also question his methods. For example, Thor might not understand all of Iron Man's high - tech jargon and would demand a more straightforward explanation. This creates a dynamic interaction based on their different backgrounds and ways of thinking.
Some of them might be really into it. Like Spider - Man (if he's considered part of the Avengers for this), he's a big fan of Iron Man in the first place, so he'd probably enjoy the fanfiction. He might even get some new ideas for his own tech - related projects from it. Dr. Strange, on the other hand, might be a bit dismissive at first. He's used to dealing with real magic and might not see the point in fictional stories about Iron Man, but then he might start to appreciate the creativity.
One great crossover could be where Iron Man in Iron Man 3 has to deal with some leftover threats from the Avengers movie. For example, a small group of Loki's minions that were missed somehow manage to target Stark Industries. Iron Man then uses the technology he developed in Iron Man 3 to fight them off in a way that combines the high - tech style of his solo movie with the more fantastical elements of the Avengers.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfictions, and there are many 'Team Iron Man' ones there. Another place is Fanfiction.net, which also has a decent number of stories related to this topic.
Captain America would likely try to be the voice of reason. He'd approach Tony with empathy, trying to understand what's going on in his head and find a way to bring him back to his senses. He might also try to keep the other Avengers calm and focused on helping Tony rather than seeing him as a threat immediately.
You can start by looking on popular fanfiction websites such as Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can use the search function to specifically look for ones related to the Avengers watching Iron Man fanfiction. Just type in the relevant keywords, and it should show you a list of stories.