It could be that Peter is in a world where he's constantly challenged to show his extreme power. Lifting a building could be part of a test or a show of his capabilities to other characters in the fanfiction. He might be doing it to prove himself worthy of something, like joining a special group or impressing a love interest.
There could be many different authors writing this kind of fanfiction. It might be written by an amateur writer who is a big fan of both Spider - Man and Thor. They might create this story just for fun and to explore the idea of these two elements coming together.
The 'Peter lifts Mjolnir fanfiction' could be a story that delves into the concept of worthiness in a different light. Peter is often seen as a selfless hero, always trying to do the right thing. So, in this fanfiction, his ability to lift Mjolnir might be a way to showcase his character growth. It could start with Peter being in a difficult situation where only the power of Mjolnir can save the day. When he lifts it, it not only gives him the physical power but also a new - found confidence and respect from his fellow superheroes.
In fanfiction, Peter Parker might be able to lift Mjolnir if the writer decides to tweak the rules a bit. Maybe it's because of his pure heart, similar to Captain America. His sense of responsibility and selflessness could be seen as worthy in the context of the fan - created scenario.
There could be many people who created such fanfiction. It might be an individual writer who is a big fan of both the Spider - Man and Thor characters and wanted to see what would happen if Peter could lift the hammer. It could also be part of a fanfiction community where different people contribute ideas and sometimes collaborate on stories.
It could be about an alternate scenario where Peter, perhaps Peter Parker from the Spider - Man universe, is somehow able to lift Thor's hammer. This might involve him having to prove his worthiness in a unique situation within the fan - created story.
One idea could be that a powerful villain has used some sort of magnetic device to pull a building towards a populated area. Spider - Man has to use his strength, along with his scientific knowledge, to counteract the force and lift the building back to its original position. Another could be that an ancient spell has been cast on a building, making it come alive and start stomping around like a giant. Spider - Man has to lift it to stop it from causing more destruction. A third idea is that a new alien substance has landed on a building, making it super - heavy. Spider - Man, in an attempt to study the substance and save the building from collapsing, has to lift it and carry it to a safe location.
In this fanfiction, it's a really exciting concept. Peter Parker, also known as Spider - Man, is able to lift Thor's hammer. This goes against the normal rules in the Marvel universe where only the worthy can lift Mjolnir. It could be that the fanfiction explores Peter's character in a new light, showing his inner worthiness perhaps through his selfless acts as Spider - Man. Maybe it also has implications for his power level, suddenly having the abilities of Thor added to his own.
Perhaps in the fanfic, Peter discovers Mjolnir during a field trip. He doesn't realize at first what it is but when he touches it, he lifts it out of curiosity. This event could draw the attention of Asgardians and Earth's mightiest heroes. They initially doubt Peter's worthiness but as he uses the hammer's power selflessly, they come to accept him as a powerful ally. The story could then revolve around Peter's adventures with this new - found power and how it changes his relationships with his friends and family.