It might include a rewritten backstory for Peter, showing how he grew up with Captain Marvel as his mom. There could be scenes of her teaching him about his powers or about the universe. Also, it may have new interactions between Peter and other characters in the Marvel universe, as they would view him differently with Captain Marvel as his mother.
A 'Captain Marvel is Peter's mom' fanfic would probably start with establishing this new family relationship. It could show how Captain Marvel balanced her superhero duties with raising Peter. Maybe there would be a story where Peter discovers his mom's superhero identity in a unique way. And it would likely include some kind of conflict that arises from this unorthodox family situation in the superhero world, like how they deal with threats while protecting their family bond. There could also be some heart - warming moments of mother - son interactions between them that are different from the normal Marvel storylines.
In some fanfics, there could be a creative interpretation where Captain Marvel is made out to be Peter's mom, but this is not part of the official Marvel canon.
One reason could be to create a new and exciting dynamic. It adds a different layer to Peter's character and backstory.
The raid might also change Peter's perception of the superhero world. He's used to his own little corner of it as Spider - Man. But when Captain Marvel comes in, she represents a whole different level of power and responsibility. This could inspire Peter to think more globally about his hero duties and perhaps even consider joining forces with other heroes on a more regular basis.
I'm not sure if there is an existing 'Captain Marvel is Peter's mom' fanfic. Fanfics can cover a wide range of wild and creative ideas, but this one seems rather unorthodox. There could potentially be some out there written by creative fans who like to explore unique relationships in the Marvel universe, but without actively searching fanfic platforms, it's hard to say for sure.
In most official Marvel lore, Captain Marvel has no relation to Peter Parker in that way. However, in fanfic, the writer can create any kind of relationship they want. So it's possible in fan - created stories for Captain Marvel to be depicted as Peter Parker's mother, but it goes against the traditional canon.
Thanos could still be a likely villain. Even if he was defeated in the official storyline, in a fanfic he could return more powerful or with a new plan. His obsession with the Infinity Stones makes him a great overarching threat.
In the beginning, Captain Marvel may be a bit strict in raising Peter, but that's because she wants him to be a great hero. Peter might rebel a bit at first. However, as they face challenges together, they would understand each other better. Captain Marvel would see Peter's potential and kindness, and Peter would see her as more than just a powerful being. Their relationship would develop into a deep, loving connection that would be the heart of the fanfic.
Well, it could be a really exciting scenario. Captain Marvel is extremely powerful, so if she 'raids' Peter's fanfic world, she might disrupt the story in a big way. Maybe she accidentally changes the plot or gets into a misunderstanding with Peter. For example, she could think Peter is involved in something dangerous when he's just dealing with normal Spider - Man stuff in the fanfic.
One way could be through some sort of time - travel or alternate reality plot. For example, if there was a situation where Captain Marvel went back in time and became involved with Peter Parker's father, or if an alternate reality had different rules of genetics and relationships. Another way could be a magical or alien - influenced situation where Captain Marvel was somehow magically linked to Peter Parker's creation in the fanfic world.
Their dynamic could be really interesting. Peter is often the underdog, still learning about his powers, while Captain Marvel is a fully - fledged powerhouse. So it could be like a novice - veteran relationship, with Peter being in awe of her abilities and Captain Marvel being a bit protective of him.