A great plot could be that Peter Parker's 'acting like a spider' behavior is caused by some sort of magical or scientific mishap. Maybe he gets exposed to a new type of radiation or a spell goes wrong. As a result, he not only acts like a spider but also starts to develop some spider - like instincts on a deeper level. He might have an irresistible urge to climb walls all the time, even when it's not necessary for crime - fighting. His friends would be very confused at first, but as they learn more about what's going on, they help him find a way to reverse the effects while also having some wild adventures along the way.
Well, in this fanfiction, perhaps Peter Parker begins to mimic a spider's hunting behavior. Instead of just using his powers to fight crime in the traditional way, he starts to stalk his enemies from the shadows, waiting patiently for the perfect moment to strike. He could also use his webs to create elaborate traps, like a spider does for its prey. This would give a whole new and interesting dynamic to his crime - fighting adventures.
Peter Parker could be developed by emphasizing his new - found spider - like curiosity. He might start exploring the city in a different way, noticing small details and hidden corners that he previously overlooked. This could lead to him discovering new threats or helping people in unexpected ways.
One possible plot could be that Peter Parker's transformation into a spider is a permanent one. He has to deal with not just his regular superhero duties but also the new challenges of being part - spider all the time. Maybe he has to learn new ways to communicate with other spiders to gain some special knowledge or power.
Maybe in this fanfiction, Peter's mutation into Spider is caused by some new and experimental Oscorp technology. The process is different from how he originally got his powers. As he mutates, he starts to lose some of his human memories and instincts, becoming more primal like a spider. His relationship with Aunt May would become very strained as she tries to understand what's happening to her nephew. Meanwhile, he has to face off against new enemies that are specifically attracted to his new spider - like form, thinking he's some kind of new prey or threat in the city.
Maybe in the fanfiction, after getting married, they decide to create a new superhero team together. But they face difficulties in recruiting members as some people are skeptical about a married couple leading a team. This could lead to a series of adventures where they prove themselves as capable leaders and build a strong team.
The field trip could be to a historical site. Peter senses that there are some ancient artifacts with strange powers hidden there. A group of thieves, who are also aware of the powers, are planning to steal them. Peter has to figure out how to stop them. He could use his knowledge of history (from all his studying) to outwit the thieves. For example, he might know of a secret passage or a trap that he can use to his advantage to protect the artifacts and keep his classmates safe at the same time.
One interesting plot idea could be Peter trying to balance his high school life with new, more dangerous threats in Queens that are not related to the big - name villains. Maybe a group of tech - savvy thieves are using stolen Stark tech in creative ways, and Peter has to outwit them without revealing his identity to his classmates. Another idea is exploring Peter's relationship with his teachers in a more in - depth way. For example, a teacher suspects that Peter is up to something unusual and starts to investigate, putting Peter in a tricky situation.
One plot idea could be Peter dealing with only half of his spider - powers. For example, he might be able to climb walls on one side of his body but not the other. This could lead to some really comical yet challenging situations as he tries to adapt.
Perhaps the female spider is a mutant spider. After biting Peter Parker, it causes his DNA to mutate in a different way than the original spider - man origin. He could start to transform into a half - spider creature at unexpected times, which would be a huge challenge for him to keep his identity secret and also control his new form.
In this type of fanfiction, the plot could start with Peter discovering his immortality after a near - death experience. He realizes that he can't die no matter what. This makes him question his own identity and his role as Spider - Man. He decides to travel the world, learning different fighting techniques and knowledge. Along the way, he still tries to protect the innocent. But he also has to deal with the fact that he will outlive everyone he loves. He might even try to find a way to reverse his immortality at some point.
Well, the plot could involve Peter Parker using his scientific knowledge to create a revolutionary product that makes him extremely wealthy overnight. With his new wealth, he decides to fund various projects in New York to fight crime more effectively. He might also face new enemies who are after his money or try to use his wealth for their own evil purposes. And his personal life would change too, as he'd be living a more luxurious lifestyle while still trying to keep his identity as Spider - Man a secret.