Their relationship could develop through shared experiences. For example, on the drive home from school, they start to open up more to each other. Tony might share some of his own childhood stories with Peter, which makes Peter feel closer to him.
This simple act of picking Peter up from school can strengthen their bond. It shows that Tony cares about Peter on a personal level, not just as a fellow superhero. Peter would feel special and more connected to Tony.
One possibility is that they could stop at a diner on the way home. Tony might give Peter some advice about his schoolwork or his superhero training. They could also discuss the latest events in the superhero world.
Perhaps when Tony picks up Peter, there's some sort of danger lurking nearby. So they end up having an impromptu adventure on the way back. Tony could show off some new gadgets to Peter to deal with the threat.
Perhaps it develops as they face challenges together. For example, if some villains target Peter at school, Natasha is there to protect him. This act of protection makes Peter trust her more deeply, and Natasha starts to see Peter as someone she wants to mentor and protect in the long run. They become closer as they rely on each other in difficult situations.
Peter could stand up to Tony. By showing his strength and not taking Tony's meanness lying down, he might earn Tony's respect. For instance, if Tony makes a snide comment, Peter could give a smart comeback that makes Tony see him in a new light.
At first, it's a bit rocky. Peter is used to being on his own, and Tony has his own way of doing things. But as they spend more time together, they find common ground. Tony helps Peter with his schoolwork, especially in science - related subjects. Peter, in turn, shows Tony the importance of having a pure heart in the superhero world. They go through challenges together, like fighting villains side by side, which deepens their bond.
The relationship could develop gradually. Peter would show his gratitude towards Tony and Pepper for taking him in. Tony would see Peter as not just a protege but also as a son. He would share his knowledge and experiences with Peter. Pepper would be involved in Peter's daily life, making sure he has everything he needs. For instance, she might cook his favorite meals or help him with his schoolwork. As they go through various challenges together, their bond would strengthen.
It could develop through shared experiences. Every time Peter calls Tony as his emergency contact, they face a new challenge together. For example, if Peter gets trapped in a collapsing building, Tony rescues him. During these situations, they learn more about each other's strengths and weaknesses, which in turn makes their relationship stronger. They start to rely on each other more, not just as superhero and mentor, but also as friends.
Their relationship could develop in a mentor - mentee way at first. Tony would teach Peter about science, technology, and how to be a better superhero. As time goes by, they would become more like father and son. Peter would start to look up to Tony not just as Iron Man, but as a dad. For example, they might have movie nights together or Tony would help Peter with his school projects.
The relationship can start out a bit rocky in some fanfictions. Tony may be initially dismissive of Peter as just a kid. But as Peter shows his capabilities, Tony starts to take him more seriously. They then start to bond over their love for science and technology. Peter is eager to learn from Tony, and Tony enjoys teaching Peter new things. This mutual exchange helps their relationship grow from a mentor - mentee one to a true friendship.