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.
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.
Perhaps Peter failed to follow Tony's instructions regarding some important technology or protocol. Tony, being a perfectionist and concerned about safety, would then yell at Peter for not listening. In the fanfiction world, this kind of conflict adds drama and tension to their relationship.
One aspect to consider in 'possessive Tony and Peter fanfiction' is the nature of their relationship. It might explore themes of protection. Tony could be possessive in a way that he wants to keep Peter safe from the various dangers in the Marvel universe, like powerful villains.
Maybe Peter misses an important training session. Tony has probably put a lot of effort into training Peter to be a better superhero. If Peter skips out on training for something unimportant, like going to a party or just being lazy, Tony would be justifiably angry and yell at him for not taking his superhero responsibilities seriously.
One possible reason could be a disagreement over superhero tactics. Peter, being young and idealistic, might yell at Tony if he thought Tony's methods were too extreme or not in line with his own sense of justice. For example, if Tony made a decision during a battle that put civilians at risk, Peter would likely be very vocal about it.
On the other hand, it could also be a turning point for the better. Sometimes a big outburst like that can clear the air. They might realize they've been misunderstanding each other and start to work on their relationship more effectively after the initial shock of the yelling.
In fanfiction, Tony being possessive of Peter can be seen as a form of over - protection. Tony, with his genius intellect and resources, might feel the need to safeguard Peter from the dangers of the world. It could also stem from a sense of mentorship and seeing Peter as a younger version of himself that he wants to guide and keep close.
One aspect of such fanfictions could be the way it challenges the traditional gender roles in superhero stories. Since male pregnancy is not a common concept in the original superhero lore, it can lead to interesting plot twists. For example, it might change the way they approach their superhero duties while also dealing with the physical and emotional changes that come with pregnancy.
One possible reason for Peter Parker to disobey Tony Stark in fanfiction could be Peter's strong sense of morality. He might see a situation where he believes the right thing to do is different from what Tony Stark commands. For example, if there is a threat to civilians and Tony's plan might endanger them more, Peter would disobey to protect the innocent.
In a fanfiction sense, Tony might kidnap Peter due to a misunderstanding. For example, if Peter was involved in some sort of experiment that Tony misinterprets as dangerous. He could be worried that Peter is being influenced by the wrong people or powers, so he kidnaps him to figure out what's really going on. Tony's actions, although extreme, could be driven by his love and concern for Peter as a mentor.