One possible plot could be that Peter has continuously disobeyed Tony's safety instructions while working in the lab or on some high - tech projects. Tony, out of frustration and a sense of responsibility, resorts to this rather extreme form of discipline. However, this kind of plot would be quite controversial and not in line with the general positive and heroic image of their relationship in the mainstream stories. It would also be a very different take on their characters, showing a more authoritarian side of Tony.
Maybe Peter inherits Tony's high - tech gadgets. For example, he could get access to some of Tony's Iron Man tech, which would be a huge deal. This could set him on a new path in his superhero journey, perhaps allowing him to upgrade his own suit or develop new abilities.
There might be some out there in the vast expanse of the fanfiction world, but it's not something that is mainstream. It could be a very niche creation by a particular author with a unique take on the relationship between Tony and Peter. However, I haven't come across it myself.
In this fanfiction, it could be that Peter snaps after Tony makes a decision that Peter strongly disagrees with. Let's say Tony decides to sacrifice a certain group of people to save the majority in a moral dilemma. Peter, who has a stronger sense of justice for the individual, snaps and decides to go against Tony's plan. He then has to fight not only the external threat but also deal with the rift he has created within the team.
Perhaps Steve leaves because of a personal sacrifice. He might discover that his presence is putting Tony and Peter in danger, like there's a villain targeting those close to him. So, to keep them safe, he leaves without much explanation. It could also be that he has some unfinished business from his past that he has to attend to alone, which forces him to part ways with Tony and Peter.
If there were such a fanfiction, the plot might be centered around Peter Parker's kind - hearted nature. He hugs this 'Ass' character, which could be an alien or a new acquaintance in his neighborhood. The 'lemon' could be incorporated as an element that brings a bit of quirkiness. For example, the 'lemon' could be a magical object that has some strange powers and they have to figure out how to deal with it while also strengthening their bond through the hug.
Yes, there might be some fanfictions that handle this in a non - inappropriate, more of a comical or mentoring - like context. For example, in some stories, it could be a way for Tony to teach Peter a lesson in a very light - hearted and non - violent way. However, it's important to note that fanfiction can vary greatly in its content and interpretation.
One possible plot development could be that Peter is left with a huge sense of guilt. He might struggle with survivor's guilt, constantly thinking that it should have been him. He could then become overly reckless in his superhero activities, trying to prove that he was worthy of being saved. Another aspect could be how the other Avengers deal with Tony's death. They may turn to Peter as a symbol of hope, since Tony sacrificed himself for Peter. This added pressure on Peter could lead to him either rising to the occasion or crumbling under it.
Possible themes could be quite diverse. There could be a theme of self - discovery. Each character might learn more about themselves through this unique relationship. It might also have a theme of power dynamics. For example, who has more influence in the threesome relationship? Additionally, themes of love and friendship could be intertwined. They might have to figure out how their existing relationships of friendship or love are affected and transformed in this new situation. And there could be a theme of secrecy or openness, depending on how they choose to handle this relationship within their world.
One possible plotline could be that Bucky is trying to teach Tony a lesson in a very unorthodox way because Tony has made a mistake that could endanger the whole team. Maybe Tony's reckless behavior in a mission led to some serious consequences, and Bucky, as a more experienced and strict figure, decides to use this rather extreme method to make Tony realize his error.
In the fanfiction world, there could be a prophecy or a pre - determined fate that Tony believes in. He may think that Peter's sacrifice is necessary to fulfill this prophecy and save the world from some greater threat related to the Soyl Stone. He might see it as a selfless act in the long run, even though it seems cruel.