There could be a plot where a villain targets Spider - Man because of his connection to the Avengers. This forces the Avengers to protect him and also helps Spider - Man understand the full scope of being part of a bigger superhero group. His relationship with characters like Captain America and Thor could develop in interesting ways during this story.
Maybe there's a big battle in New York where Spider - Man is already on the scene. The Avengers arrive and they end up working together. This could lead to Spider - Man being invited to join the team officially. There could be some interesting character dynamics as he gets to know the other heroes better.
He could be a new recruit. The Avengers are always looking for new talent, and Spider - Man's abilities would be a great addition. He could start off as a bit of an outsider, trying to fit in with the more experienced heroes.
In a fanfiction, Spider - Man could get lost in an alternate dimension during a mission. The Avengers then have to find a way to bring him back. While in the alternate dimension, Spider - Man meets different versions of the Avengers and has to fight his way through various challenges to return home.
Fanfictions sometimes create scenarios where Spider - Man from 'Homecoming' has to prove himself to the established Avengers. His youth and inexperience contrast with the more seasoned heroes. This can lead to interesting character development arcs, such as him learning from the Avengers' combat strategies and they in turn learning from his unique approach to fighting crime on a smaller scale.
A great fanfiction in this genre is 'Avengers' Movie Night'. In it, the Avengers gather to watch Spider - Man: Homecoming. It's full of humorous exchanges as they react to the movie. For instance, Clint Barton keeps making jokes about Peter's youthfulness.
One idea could be a fanfiction where Spider - Man has to team up with the Avengers to stop a new villain that is specifically targeting his neighborhood in Queens. This would combine the street - level heroics of Spider - Man with the big - scale action of the Avengers.
One popular trope is the mentorship. Since Spider - Man has a connection with Tony Stark in the movie, fanfictions often expand on this. Another is the 'fish out of water' trope where Spider - Man is out of his comfort zone when dealing with the Avengers' big - scale operations.
Obviously, Spider - Man himself is a very popular character to focus on. His relatable character, with his high - school problems and superhero duties, makes for great fanfiction material.
One idea could be Spider - Man joining the Avengers on a mission to a far - off planet. He uses his agility and quick thinking to help the team out of tricky situations. Another could be a story where Spider - Man has to prove himself to the Avengers in a training exercise set up by Iron Man.
In some fanfictions, Peter could be hurt physically during battles. For example, he might take more severe hits from villains than in the movie. This could be because the writers want to explore his vulnerability and the limits of his powers.
You can start by looking on fanfiction - specific websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can simply search for 'Avengers watch Spider - Man: Homecoming' in the search bar. There are usually filters you can use to sort by popularity, rating, etc.
There might be a fanfiction where the Avengers turn the viewing of 'Spider - Man: Homecoming' into a training session for Peter. They pause the movie at different points to discuss what he could have done better and how to handle various situations. For example, Black Widow could be teaching him about stealth during a scene where Peter is sneaking around in the movie.