It could mean that Peter Parker is about to take on a much larger role in the fanfiction's universe. Lifting Mjolnir gives him a new level of power and respect. It might also lead to new alliances or rivalries, as other characters react to his new - found ability.
One possible plot could be that in a universe where the rules are a bit more fluid, Spider - Man finds himself in a situation where he has to lift Mjolnir to save the day. Maybe the Avengers are all incapacitated and only he can reach the hammer. He approaches it with his usual self - doubting self, but his pure heart and strong sense of responsibility allow him to lift it. With Mjolnir's power, he then battles against a powerful villain like Thanos, using both his spider - abilities and the power of Thor's hammer.
It might mean that the author is exploring new aspects of power and heroism. Harry Potter is known for his magical abilities within his own series, but lifting Mjolnir takes it to a new level. It could be about combining different power systems. Maybe in this fanfiction, the lifting of Mjolnir gives Harry new powers or a new understanding of magic that he didn't have before. It's a creative way to expand on both the Harry Potter and Thor mythologies.
Sure. There are fanfiction platforms like Archive of Our Own (AO3) where you can search for such stories. Writers might be inspired by the idea of Peter's strength of character, his sense of responsibility which could potentially make him worthy to wield Mjolnir. It could also lead to some really cool crossovers between the Spider - Man and Thor storylines, with Peter interacting with the other Avengers in new and exciting ways while in possession of the hammer.
It could be really exciting. Maybe Peter is in a battle where all seems lost, and suddenly he realizes he can lift Mjolnir. He then uses the power of the hammer along with his Spider - Man skills to turn the tide of the battle. The story might also explore how his friends and other superheroes react to this new development.
In some fanfictions, Tony lifting Mjolnir could be part of a time - travel or alternate universe plot. For example, he lifts it in a universe where the rules are slightly different. This could then lead to a whole chain of events where he has to fix the timeline or find a way to bring the power of Mjolnir back to his own universe. It could be a really exciting adventure filled with lots of twists and turns.
Some fanfictions might explore it through a comedic lens. For instance, Tony might be really surprised when he lifts Mjolnir and then starts using it in really goofy ways, like using it as a tool to fix his car instead of for heroic deeds. It could be a light - hearted take on the whole concept.
In this fanfiction, it could be that the magic in Harry's world has a connection to the enchantment on Mjolnir. Maybe the ancient magic that runs through Harry's veins is recognized by Mjolnir's magic as something worthy. So, when Harry tries to lift it, his magic interacts with the hammer's magic in a positive way, allowing him to pick it up.