There's no official story about the Avengers sitting down to watch Iron Man fanfic. Fanfics are creations by fans and not really part of the official MCU (Marvel Cinematic Universe) canon. However, it would be an interesting concept. Maybe some of the more tech - savvy Avengers like Tony Stark himself (if he were alive in a fictional scenario where fanfic existed in their world) might be curious about what fans write about him.
For Thor, it might be the action scenes where Iron Man is flying around and shooting things. He'd probably enjoy the display of power. Natasha might like the scenes where Tony is being clever and outsmarting his enemies with his technology.
Well, they might react to Tony Stark's self - destructive behavior. Maybe Thor would be amused by the technology, seeing it as primitive compared to Asgard's. And Natasha could be analyzing every move for potential threats or weaknesses in Stark's armor.
Some might be amazed. For example, Hawkeye would be impressed by Iron Man's new flying maneuvers. Others like Falcon could be taking mental notes on Iron Man's technology for his own gear. And Tony Stark himself would probably be enjoying the attention and bragging a bit about his new suit's features.
Some of them might be critical. Captain America, being a traditionalist, could have issues with how the fanfiction might deviate from the 'true' version of Iron Man he knows. He might think some characterizations are inaccurate. Hulk, on the other hand, might not care much at first, but if the fanfiction angers him in some way, like making Iron Man look bad when he shouldn't, he could get a bit riled up.
Well, they might be really excited. They could be commenting on all the new gadgets Iron Man seems to have in the trailer. Maybe Thor would be a bit confused by some of the high - tech stuff, while Black Widow would be analyzing every move Iron Man makes for strategic purposes.
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.
One great story could be where the Avengers watch Iron Man's early adventures in fanfiction form. It might show their reactions to his first attempts at building the suit, like Tony Stark in his garage. They could be laughing at his initial clumsy attempts but also be in awe of his determination.
One popular theme is alternate universes. Writers like to explore what would happen if certain events in the MCU went differently, like if Iron Man didn't build the first Iron Man suit. It gives a whole new perspective on the characters.
A really cool fanfic is 'Iron Man's Redemption'. In this story, Tony has to face the consequences of some of his past actions and tries to redeem himself while also dealing with new threats to the Avengers. It delves deep into his character.