Well, in a lot of such fanfics, it often starts with Peter making a small mistake while being Spider - Man. Maybe he leaves behind some evidence that's a bit too obvious, like his school notebook with his name on it at a crime scene. The Avengers, being the sharp - eyed group they are, start to piece things together. Tony Stark might be the first to suspect something, using his high - tech gadgets to analyze the蛛丝马迹 (clues). Once they figure it out, they could either be super protective of Peter, seeing him as a young and inexperienced hero, or they might be a bit wary, not sure if they can fully trust this new - found Spider - Man.
In some versions, Peter's fangirling over the Avengers as Spider - Man gives him away. He might accidentally let slip some inside knowledge about the Avengers that only a big fan would know while chatting with them during a fight or a rescue mission. For example, he could mention something specific about Captain America's shield technique that he learned from studying the Avengers obsessively. This makes the Avengers curious and they start to dig deeper into Spider - Man's identity. Eventually, they find out it's Peter. Then it depends on the mood of the writer. They could write a heart - warming story where the Avengers take Peter under their wing and train him, or a more angsty one where Peter has to prove himself all over again to earn their trust.
Well, it could also happen that Peter's Spider - Man suit technology gives him away. Maybe the Avengers have some advanced tech - sensing equipment, and when Peter is around in his suit, it gives off some unique signals that the Avengers pick up on. So, they start to look into it and eventually figure out that Peter is Spider - Man.
Tony Stark would probably be both proud and a bit worried. Proud because Peter is this brilliant young mind who has managed to be a hero on his own, but worried because he's just a kid. He might start to hover over Peter more, offering him better tech and trying to mentor him more closely. Captain America would likely be very accepting. He sees the good in people and would be happy to have another brave soul on the team. He'd probably offer Peter some words of wisdom about using his powers responsibly. Thor might be a bit clueless at first. He doesn't quite understand the whole 'secret identity' thing as well as the others, but once he gets it, he'd be all for having Peter around. He might see Peter as a little warrior and be eager to train him in his own Asgardian ways.
Some Avengers might be protective. For instance, Captain America could immediately start giving Peter advice on how to better handle his dual identity and keep himself safe. He might offer training sessions to help Peter improve his skills as Spider - Man.
The Avengers could find out who Spider-Man is in fanfiction by a trusted insider accidentally spilling the beans. Or perhaps a villain uses this knowledge to manipulate the situation and forces the truth to come out.
Peter could be really nervous at first. He's been keeping this huge secret and now it's out. He might stutter and try to explain himself, saying he was just trying to protect her.
One idea could be that the Avengers are initially shocked but then become very protective of Spider - Man. They might start to train him more carefully, like Tony Stark making sure his suit has extra safety features. Another could be that some of the Avengers, like Captain America, take on a mentor role, teaching him about responsibility and heroism in a more age - appropriate way.
It could be a really exciting and unexpected encounter. Maybe Howard is shocked by Peter's abilities or they have a deep conversation about the future.
Maybe it's a tense meeting with lots of misunderstandings and later resolutions. Or it could start off awkward but end up with a mutual understanding and respect.
Well, with the Avengers knowing his identity, Peter's relationship with Natasha Romanoff could be really interesting. She might teach him some spy - like skills to keep his identity even more hidden from other threats. As for Thor, he could be a bit clueless about how to deal with a young hero like Peter, but still offer his support in his own way. And Peter's relationship with MJ would also change. She might be more involved in his superhero life now, which could bring them closer together or create some new tensions depending on how she reacts to the whole situation.
One way is by getting involved in Peter's school life in a more official capacity. Maybe they could arrange for some anti - bullying seminars at the school. Natasha could also train Peter in stealth and evasion techniques so that he can avoid the bullies more easily. Thor could even offer to be Peter's bodyguard for a while, at least until the bullying situation is resolved.