The plot may develop with his enemies taking advantage of his weakened state. They might try to attack him while he's in the hospital or at home recovering. On the other hand, his allies, like the Avengers if they exist in that fanfiction world, could come to protect him and help him figure out what caused the collapse in the first place.
One possible reason could be overexertion. Peter Parker is often depicted as taking on a lot of responsibilities both as Spider - Man and as an Avenger. He might be pushing himself too hard in a fight or during a mission, leading to a collapse. Another reason could be some sort of external attack that affects his physical or mental state, like a new type of villain's weapon that drains his energy.
The Green Goblin could be a main antagonist. He's known for causing chaos in New York City, and a building collapse would be right up his alley. He could be targeting the building for some strategic reason, like trying to get to Peter Parker or to create general mayhem.
One possible plotline could be Peter Parker using his spider - abilities to rescue people trapped in the collapsing building. He might swing in and out, carrying people to safety one by one. Another could be that Peter has to deal with his secret identity while trying to save the day during the building collapse. For example, he has to find a way to change into his suit without being noticed, or he might be recognized by someone he knows while in the middle of the rescue operation.
One great Peter Parker school fanfiction is 'Peter Parker's High School Days'. It really delves into his daily life at school, his struggles with grades while also being Spider - Man. It has a lot of interesting interactions with his classmates and teachers that feel very true to the character.
Peter Parker's PTSD can add a lot of depth to fanfiction set in school. It could show how he struggles to focus in class, or has flashbacks during school events. For example, a loud noise in the hallway might trigger his PTSD from his superhero battles. Writers can use this to explore his character further and show how he copes in a school environment.
The other Avengers would likely be very concerned. They might immediately stop whatever they are doing to tend to him. For example, Tony Stark could use his technology to try and figure out what's wrong with Peter. Captain America would probably be the one to keep everyone calm and organized while they figure out a plan to help Peter.
Tony Stark might immediately rush to his side and start scanning him with his high - tech gadgets to find out what's wrong. He'd be worried as he sees Peter as a sort of protege. Captain America would probably be more of a calming presence, trying to keep everyone else from panicking while waiting for medical help if needed.
In some fanfiction scenarios, Peter might be dealing with some sort of internal power struggle. If his spider - powers are evolving or being affected in some way, it could lead to his collapse at school. For instance, if there's a glitch in his powers that causes his body to have sudden energy drains or physical reactions, like collapsing, while he's at school trying to act normal.
The theme of hiding his identity is quite prevalent too. Peter has to keep his Spider - Man persona a secret from his classmates and teachers. This creates a lot of tense and interesting situations in the fanfiction. He might have to come up with excuses for being late or missing school events because he's out fighting crime. Also, the theme of growing up and dealing with the typical high school problems like first love, peer pressure, and fitting in, all while having this huge secret and great responsibility.