Well, perhaps in this fanfiction, Peter Parker turns into a spider due to some sort of magic gone wrong. He then has to find a way to reverse it while also using his new spider - form to his advantage in fighting crime. He might discover that he can move in ways he never could as a human - spider hybrid and use that to outwit his enemies.
In this fanfiction, it could be that Peter Parker's transformation into a spider is part of an experiment by a new villain. This villain wants to create an army of spider - like creatures. Peter has to figure out how to break free from the villain's control while in his spider form. He might also meet other victims of the experiment and they have to work together to stop the villain. As he is in the spider form, he has to adapt his fighting style and use his new abilities such as spinning different kinds of webs that he couldn't before.
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.
The main antagonist could be Doctor Octopus. He might see Peter's new form as an interesting specimen to study and wants to capture him for his own evil experiments. He could use his mechanical arms to try and trap Peter in his spider form.
Well, perhaps in the fanfiction, Peter's memories as an adult are still somewhat intact in his baby form. So he tries to communicate with his loved ones in his own baby - like ways, like making specific noises when danger is near or trying to write in a very clumsy way. This could lead to some really cute and interesting interactions.
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.
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.
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.
Well, in a fanfiction where Peter Parker turns into a kid, perhaps he could end up at his old school. He'd be faced with bullies again, but this time he has the knowledge and experience of being Spider - Man, even if he's in a kid's body. This could lead to some interesting scenarios where he uses his smarts to outwit the bullies without using his powers directly. Or, he could befriend his younger self's friends in a whole new way, seeing them from a different perspective.
Well, the consequences could be far - reaching. In the superhero world, his absence as the full - fledged Spider - Man could lead to a power vacuum. Villains might become bolder, thinking Spider - Man is gone. On a more personal level, Peter as a kid might struggle with his identity. He's used to being a responsible superhero, but now he's a child again. He might have to relearn how to control his powers as they could be affected by his new physical state. And his relationships with love interests would also be affected. They might see him as a cute kid rather than the man they were attracted to, which could create some really interesting and complex storylines.
In a 'Peter Parker Funeral' fanfiction, the story might start with the discovery of Peter's death. It could be due to a powerful villain finally getting the upper hand. His Aunt May is heartbroken. The funeral could be a very private affair, with only his closest friends and family. But as the news spreads, the whole city starts to remember Spider - Man's deeds. There could be a lot of flashbacks in the fanfiction, showing how Peter grew into the hero he was.
One possible plot could be that Peter Parker is experimented on by some villain who wants to create chaos. The experiment goes wrong and it starts to mess with his mind, turning him into a Joker - like figure. He then starts to cause mayhem in New York City, using his spider - powers in ways that are more for destruction and amusement rather than heroism. His friends and family are shocked and try to figure out what happened to him and how to bring him back to his normal self.
One possible plot could be that Peter discovers he has Asgardian blood through some magical accident. He then starts to have visions of Asgard and is eventually drawn there. Once in Asgard, he has to prove himself worthy, just like Thor did with Mjolnir, but with his own unique set of skills as Spider - Man.