Often, the relationship develops gradually as they get to know each other's personalities. If Tony's wife is kind - hearted and empathetic, she could become a sort of emotional support for the Avengers. They might come to her with their problems, and she'd offer advice. This would build a strong bond over time, making her an important part of their extended family within the fanfiction world.
In some fanfictions, their relationship deepens as they face new challenges together. The events of the Avengers might have made them realize how much they need each other. So they become more supportive and understanding of one another. For example, Tony might be more open with Pepper about his fears and insecurities.
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.
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.
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.
Well, it might start with a bit of mutual distrust. Tony might think Ziva is too serious and Ziva might think Tony is too flippant. But as they work together on cases, they start to see the good in each other. For example, Tony realizes Ziva's loyalty and Ziva sees Tony's intelligence in solving cases.
Their relationship might become stronger as they go through the pregnancy together. They'll have to rely on each other more, which deepens their bond.
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.
Often, their relationship is tested. Tony's involvement in the Civil War can cause stress between them. Pepper might worry about his safety and the moral implications of his actions.
Peter would probably develop a closer relationship with Steve. Steve, being the moral compass of the team, would take on a sort of father - figure role. He'd give Peter advice on being a hero and living up to the 'Stark' name in a good way.
Their relationship starts with a chance encounter and immediate attraction. They quickly fall in love, ignoring the gang tensions around them.