Maybe on this field trip, they go to a Stark Industries secret project site. Tony, being Peter's mentor and father - son like relationship, is showing Peter around. However, they encounter some spies trying to steal the technology. Peter and Tony then have to work together, with Peter using his spider - powers in creative ways and Tony using his tech - savvy mind, to stop the spies and save the day.
A great plot could involve Peter and Tony going on a field trip to a science expo. Tony, as the father - like figure, wants to inspire Peter even more. But then they get separated in the large expo hall. Peter has to use the skills Tony taught him to find his way back to Tony while also making some interesting scientific discoveries on his own. This would show Peter's growth and their relationship.
Peter would likely be in awe of everything and constantly asking Tony questions. Tony, in his father - son role, would patiently answer, with a bit of his usual sarcastic charm. For example, if they see a new piece of tech, Peter would say 'Mr. Stark, how does this work?' and Tony would reply 'Kid, if I told you all my secrets, where would the fun be?'
The field trip could be to a historical site. Peter senses that there are some ancient artifacts with strange powers hidden there. A group of thieves, who are also aware of the powers, are planning to steal them. Peter has to figure out how to stop them. He could use his knowledge of history (from all his studying) to outwit the thieves. For example, he might know of a secret passage or a trap that he can use to his advantage to protect the artifacts and keep his classmates safe at the same time.
Well, Peter could encounter a strange scientific anomaly during the field trip. Maybe he discovers a new form of energy that no one has ever seen before. He would then use his Stark - like intelligence to try and understand it, and perhaps even come up with a way to harness it.
One plot idea could be that Tony discovers Peter has a hidden talent for advanced robotics engineering that he's been too shy to show. So, Tony takes Peter under his wing to develop this talent further. Another could be that Peter gets into some kind of trouble at school related to his superhero identity, and Tony has to step in as a father figure to help him out. Maybe Peter accidentally reveals his powers in front of some untrustworthy people at school, and Tony has to deal with the potential exposure.
One possible plot could be Peter growing up in the Stark mansion, having access to all of Tony's technology. He might start inventing things at a very young age. And when he gets his spider - powers, Tony could be more directly involved in helping him develop his suit and his skills as a superhero.
Well, it could be that Peter discovers his true identity as Tony's son through some hidden documents or a revelation by an old acquaintance of Tony's. Maybe he has some special powers that are linked to Tony's technology, and as he uncovers his relation, he also has to face the enemies that were once after Tony.
In many Tony and Peter fanfictions, the father - son relationship is often a heartwarming and complex one. Tony, being a mentor - like figure, can be seen as a father figure to Peter. He might guide Peter in his superhero journey, teaching him about using his powers responsibly and also about the harsh realities of the world they live in.
One common theme is mentorship. Tony often takes on the role of teaching Peter about being a superhero, like how to use his powers effectively and make smart decisions in dangerous situations.
The theme of sacrifice is also present. Tony might sacrifice his own well - being or resources for Peter's sake. And there's the theme of inheritance, like Peter inheriting Tony's technology or his sense of justice.
Another theme is family and belonging. Since Peter doesn't have a father figure in the original story in the same way, fanfictions explore how Tony fills that role and how Peter finds a new family in Tony. It's about creating a sense of home and acceptance between them. For example, in many fanfictions, Tony provides a stable home environment for Peter which he was lacking before.