Well, 'The Bond Beyond Webs' is quite popular. It really focuses on the deep friendship between Harry and Peter. It shows how they support each other through tough times in school and in Peter's superhero life.
One great fanfiction could be where Harry discovers Peter's secret as Spider - Man early on. It might explore how their friendship changes and how Harry could potentially help Peter in his superhero duties. Maybe Harry uses his wealth and resources to create better gadgets for Peter.
Their relationship could develop uniquely if Harry becomes a sort of mentor to Peter in the business and science side of things. Since Harry has access to Oscorp's resources, he could teach Peter about advanced technology that could be useful for his Spider - Man activities. This would create a different dynamic from the typical superhero - sidekick relationship.
One plot idea could be that Harry discovers Peter's secret identity as Spider - Man by accident. Maybe he sees Peter changing into his suit in a hidden alley. Then, instead of being angry or jealous, he decides to help Peter in his fight against crime. He could use his Oscorp resources to create new gadgets for Spider - Man.
Their relationship could be developed through shared secrets. For example, if Peter reveals his identity to Harry, it could create a deeper bond. They could then train together and learn from each other's strengths and weaknesses.
In some fanfictions, there could be a story where Harry discovers Peter's secret identity in a unique way. Maybe he stumbles upon Peter changing into his Spiderman suit by accident. Then, their friendship takes a new turn as Harry has to decide whether to support Peter or be angry about the secrecy.
A plot could involve Harry getting powers as well, not just from the Goblin formula but in a different way related to some Oscorp experiment. He and Peter then have to figure out how to control their powers together and face a new supervillain created by Oscorp's misdeeds. It would add a new dynamic to their relationship as they both struggle with their newfound abilities.
Perhaps there's been some sort of miscommunication or misunderstanding among Peter and his friends. Maybe a villain has manipulated the situation in such a way that his friends now think Peter has betrayed them, so they've cut off all ties with him. This would create a very lonely and difficult situation for Peter in the fanfiction.
Fanfiction about Peter and MJ in the context of Spiderman and Spiderwoman often plays with different timelines and universes. For instance, there could be a fanfic set in an alternate universe where MJ has superpowers too. This would change the dynamics of their relationship completely. Writers can also explore how Peter and MJ interact with Spiderwoman in these fictional stories.