Another idea is that there's a device that is stealing the powers of all the heroes in the Marvel universe. Spider - Man and Captain Marvel are two of the last ones with their powers intact. They go on a hunt to find the device and stop it. Along the way, they face challenges that test their limits. Spider - Man has to rely on his wits more than ever, and Captain Marvel has to learn to trust Spider - Man's instincts as they race against time to save their fellow heroes.
A possible storyline is that they get caught in an alternate universe where they are the only heroes left. They have to figure out how to get back to their own universe while also protecting this new one. Spider - Man might be a bit out of his depth at first in this strange new world, but Captain Marvel would be there to encourage him and together they'd find a way. Their relationship could develop from just teammates to really good friends during this adventure.
A common plot is that Spider Man's harem is formed due to some kind of magical or scientific experiment gone wrong. For example, a device meant to create a new type of energy instead creates a bond between him and several Marvel women. As a result, they have to learn to live together and deal with the new dynamic, which includes fighting bad guys and exploring their new relationships.
Perhaps a fanfiction could be centered around Peter being accidentally transported to Carol's part of the universe. He has to rely on her to get back home. During this time, they encounter different alien species and face various challenges. Carol helps Peter understand the vastness of the cosmos while Peter shows Carol the importance of small - scale heroics. Their relationship could evolve from just teammates to close friends, and maybe even something more, as they overcome these obstacles together.
One possible fanfiction could involve Spider - Man and Captain Marvel teaming up during the Endgame battle. Maybe Spider - Man uses his agility to distract the enemy while Captain Marvel blasts them with her powerful energy. They could also have some fun banter, like Spider - Man making a joke about how Captain Marvel can fly and he has to swing around.
One great storyline could be them teaming up to take on a powerful new villain in Hell's Kitchen. Spider - Man's acrobatic skills and Jessica's detective work would make for an interesting combination as they track down the bad guy. Another could be a story where they have to protect a group of civilians from a super - powered threat. They'd have to learn to work together, with Spider - Man using his webs to create barriers and Jessica using her strength to fight up close.
A great fanfic might involve a scenario where Spider - Man gets transported to a different dimension where Captain Marvel is in trouble. He has to use his wits and skills to help her out. Their relationship could start as a bit of a rocky partnership but grow into a strong friendship as they face challenges together. In this fanfic, there could be some really cool action scenes with Spider - Man swinging around while Captain Marvel is flying and blasting enemies.
A fanfiction could revolve around Captain Marvel losing her powers temporarily and Nick Fury having to protect her while also trying to find a way to get her powers back. This would put their relationship to the test and show how much they rely on each other in different ways.
One great storyline could be where Iron Man and Captain Marvel team up to face a new, powerful alien threat that neither could handle alone. They combine their technological and super - powered skills to outwit the enemy. For example, Iron Man could use his suit's advanced sensors to locate the alien's weak points, while Captain Marvel uses her strength and energy blasts to attack.
One interesting storyline could be Spider - Man and Ms. Marvel teaming up to stop a new super - villain who has the power to manipulate time. They would have to use their unique abilities to navigate through different time periods and figure out the villain's plan. Another could be a story where they accidentally swap powers for a short time, leading to some humorous and challenging situations as they get used to each other's powers.
At first, they might be a bit wary of each other. Spider - Man is used to working on the streets of New York, while Captain Marvel is more of a cosmic hero. But as they face challenges together, they start to respect each other's abilities. Eventually, they could become good friends and rely on each other in future battles.
Another fanfiction concept could be a mentorship situation. Spider - Man looks up to Captain Marvel as a powerful and experienced hero. She could train him to better control his powers and also teach him how to handle the pressure of being a hero on a larger scale. This could involve some intense training sessions where Spider - Man has to push his limits, and Captain Marvel shares stories from her own experiences in the galaxy.