Some 'Avengers Watch Endgame' fanfictions focus on the reactions of the Avengers during the viewing. For example, Thor might have a more emotional breakdown seeing his past self struggle so much, or Tony Stark could be making sarcastic comments throughout the viewing, which both add humor and depth to the story.
One great 'Avengers watch Endgame' fanfic could be 'The Reactions Unseen'. It delves into the emotional turmoil each Avenger goes through while watching the events of Endgame unfold. Another is 'Behind the Screen', which focuses on their conversations during the viewing, adding a lot of character depth.
One highly regarded story is 'The New Beginning' which explores what happens after the events of Endgame in a really unique way. It delves deep into the characters' emotions and how they cope with the new world they're in. Another great one is 'Beyond the Snap' which focuses on the alternate timelines that could have been created during the events of the movie. It's really interesting to see how the author plays with the concepts from the movie.
Another option could be Tumblr. There are many Tumblr blogs dedicated to Marvel and Avengers in particular. While it's not as organized as the dedicated fanfiction platforms, with some searching, you can come across some interesting Avengers Endgame fan - written stories.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfiction on various topics, including Avengers watching Avengers Endgame. There are also some fanfiction sections on dedicated superhero forums where fans share their creative works.
A really cool plot idea could be that the Avengers are watching Endgame in a sort of 'alternate reality cinema' where the events in the movie start to bleed into their real world. So they have to stop the movie from fully playing out to prevent chaos in their own universe. This would involve a lot of action and strategic thinking as they try to stop things like Thanos from emerging from the screen while also trying to understand the significance of what they're seeing in the movie.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfics, and it's likely you'll find many 'Avengers watch Endgame' ones there. Just use the search bar and type in relevant keywords.
There's a chance that side characters get more focus too. Maybe characters like Rhodey or Nebula could have more in - depth character development as they react to the events of Endgame while being watched by the Avengers in the fanfiction.
Well, one interesting thing could be the characters' reactions. They might have different emotional responses seeing the events of Endgame unfold in the fanfiction compared to the movie. For example, Iron Man could show more internal struggle as he witnesses his sacrifice again.