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.
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.
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.
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.
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.
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.
In a fanfiction like this, there could be a lot of challenges. Their different backgrounds - Peter Parker's normal life as a student and Carol Danvers' military - turned - superhero past - could create some interesting conflicts. But they could also learn from each other. Spider - Man could teach Captain Marvel about the little joys of a normal life, and she could show him how to be more confident in the big superhero world.
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.
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.