Often, they emphasize the relationship between Peter and Tony. It could be a mentor - mentee relationship like in many stories where Tony imparts his wisdom and experience to Peter. For example, in some fanfics, Tony helps Peter understand his powers better.
Perhaps in the fanfic's storyline, Tony is facing a lot of pressure himself, like threats from powerful villains or issues within the Avengers. Peter's actions, whether they are mistakes or just inconvenient timing, could be the straw that breaks the camel's back for Tony, causing him to yell at Peter.
Another possibility is that Doctor Strange could rescue Peter. He has powerful magic and the ability to travel through different dimensions. He might sense that Peter is in danger through his magic and use his powers to find Dark Tony's lair and free Peter. Strange could also use his magic to fight off Dark Tony if he tries to stop the rescue.
Family is also a theme sometimes. They can be seen as a sort of surrogate family to each other. For example, Tony may act like a father figure to Peter. Additionally, the theme of heroism and growing into one's role as a hero is often explored. Peter is learning from Tony how to be a better hero, and Tony is also learning from Peter in some ways, like how to have more hope and innocence in the face of danger.
A common theme is the father - son like relationship. Tony often takes on a paternal role towards Peter. Another theme is the passing on of knowledge, like Tony teaching Peter about his high - tech gadgets and combat strategies.
It might not be that common. Usually, fanfics tend to focus more on positive interactions or team - up scenarios between characters. Hitting is a rather negative and extreme form of interaction, so it may not be as frequently explored in fanfic writing.
One common theme is mentorship. Tony often takes Peter under his wing, guiding him in the world of superheroes. For example, in many fics, Tony teaches Peter about new tech for his suit.
In the 'tony hits peter fanfic', it could be set in a situation where an external force is influencing Tony's actions. Maybe an enemy has some kind of mind - control device on Tony. So, Tony hits Peter without his true self being in control. Peter then has to figure out what's wrong with Tony and find a way to break the mind - control, all while dealing with the physical and emotional pain of being hit by someone he looks up to.
There could be a strain in their relationship. Peter might feel hurt and start to distance himself from Tony for a while. However, this could also lead to a deeper understanding between them as they later communicate about their feelings.
One that stands out is 'Tony and Peter: The Unlikely Bond'. It begins with their initial meeting and how they were both a bit skeptical of each other at first. As the story progresses, they come to understand and respect one another more. There are also some really nice moments where they have heart - to - heart conversations that are really engaging.