Peter could be really worried. He might think that Tony will make fun of him or think less of him for being such a big Spider - Man fan. However, when he sees that Tony is actually interested and not judgmental, he relaxes and starts to excitedly share all the things he loves about Spider - Man, like his web - slinging abilities and his sense of justice.
Peter might be embarrassed at first. He's been idolizing Spider - Man and now Tony, a real - life hero - like figure, knows about it. But then he realizes that Tony could be an even greater source of knowledge and support, so he becomes more open about his love for Spider - Man.
Well, Tony might be initially surprised. He could then start to use Peter's love for Spider - Man to his advantage. Maybe he'd give Peter more tasks related to Spider - Man tech, knowing that Peter would be more motivated. He might also start to train Peter in a way that's inspired by Spider - Man's abilities.
Peter might be initially shocked and a bit scared. After all, Tony is like a mentor to him. But then he could become defensive, trying to explain his actions or point of view.
Peter might be really nervous at first. He's used to being just the friendly neighborhood Spider - Man, and now the Avengers know he's Tony's son. He could be worried about living up to their expectations.
In some fanfictions, Mary Jane's reaction can be quite complex. She could be a bit angry at first for being kept in the dark. However, her love for Peter would likely override that anger. She might start to worry more about his safety as Spider - Man, constantly fretting when he goes out to fight crime. She could also become more involved in his superhero life, helping him keep his secret and offering support in ways she didn't before.
Harry's reaction can vary a great deal. Sometimes, he gets angry because Peter has been keeping such a huge secret from him. After all, they are supposed to be close friends. However, as he realizes the danger that Peter has been facing as Spider - Man, he may come to understand why Peter had to keep it a secret. And eventually, he might offer his help to Peter in his superhero endeavors.
She might be shocked at first. After all, it's not every day you find out your friend is a superhero. But then she could also be really excited and proud of him.
Tony could be initially shocked. He might not understand why Peter would run away, especially if they had a good relationship before. He'd probably start searching for Peter right away, using all his resources.
Peter would probably be really confused at first. He looks up to Tony, and suddenly being kidnapped by him would be a huge shock. He might try to talk to Tony, asking him why he's doing this.
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.
Peter is likely to be in awe. He might be a bit nervous at first, but also extremely excited. He has looked up to the Avengers for a long time, so meeting them would be like a dream come true. He would probably be stuttering a bit as he tries to introduce himself and show his respect.