Another scenario could be that there is a power struggle. Captain Marvel is seen as a very powerful hero, and Spider - Man might feel that she is overstepping in New York (his territory). So, he starts to oppose her actions, which escalates into a full - blown feud. This would involve some intense confrontations where both would have to use their powers to the fullest.
Perhaps in a different universe, there are different versions of them. One where Captain Marvel has been corrupted by some dark force, and Spider - Man has to stop her. He would be the underdog in this fight, but with his intelligence and quick thinking, he could find a way to break the hold of the dark force on her. This would be a great story of redemption and heroism.
One idea for a Captain Marvel and Spider - Man fanfic could be that they team up to fight a common enemy from another dimension. Maybe a powerful alien force is trying to invade Earth, and their combined powers are needed to stop it. Captain Marvel with her energy - based powers and flight, and Spider - Man with his agility and web - slinging skills would make an awesome duo.
One possibility in such a fanfic could be that they meet during a major inter - galactic crisis. Maybe they start off as allies, gradually realizing they have deep feelings for each other. Their different powers could combine in interesting ways to save the day, and this shared experience could be the start of their romantic journey towards marriage.
The plot could involve a new villain who targets both of them because of their relationship. This villain might be someone who wants to disrupt the harmony between Earth and the cosmos. Spider - Man and Captain Marvel have to work together to defeat this enemy while also dealing with the challenges of their new - found married life.
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.
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.
You can try websites like Archive of Our Own (AO3). It has a large collection of fan - made stories, including many 'Captain Marvel x Spider - Man' fanfics. The site is well - organized, and you can easily search for the specific pairing you're interested in.
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.
Imagine in the fanfiction, Spider - Man discovers a new ability during Endgame that can complement Captain Marvel's power. He shares this with her, and they experiment with combining their powers in new ways. For instance, Spider - Man could create a web - like energy field using his new ability, and Captain Marvel could charge it with her cosmic energy to create a powerful shield or weapon against the enemy.
There have been instances where Spider-Man and Captain Marvel have squared off in the comics. It usually depends on the circumstances and the overall narrative of the comic series.
The plot might involve an interdimensional force that accidentally merges the worlds of Spider - Man and Captain Marvel in a way that forces them into a shared adventure. They could be in a situation where they have to protect a group of innocent people caught in this strange merge. Since they are from different hero backgrounds, they initially clash but then gradually learn to work together as they face greater threats.