Yes, there are quite a few out there. You can start by looking on some popular fanfiction websites like Archive of Our Own. There, you might find different takes on this pairing getting married, from action - packed adventures that lead to their union to more character - driven stories exploring their relationship dynamics before and after the marriage.
Well, the plot could involve them getting married in an alternate universe where the rules of their relationship are different. For example, in this universe, heroes and villains are more likely to form alliances through marriage. So they get married, but then face challenges from other villains who don't like Black Cat being on Spiderman's side, and they have to fight together to protect their new relationship.
In such a fanfiction, perhaps they would have to keep their marriage a secret from the public. Spider - Man's identity is already a big secret, and adding a marriage to Black Cat would make things even more complicated. They could have adventures while trying to balance their married life and superhero duties, like going on dates in between fighting bad guys.
A plot twist could be that Black Cat is actually working undercover for a bigger villain all along, and her marriage to Spiderman is part of her plan. This would shatter Spiderman's trust and lead to a big conflict between them.
One common scenario in such fanfiction could be that Black Cat is jealous of Spiderman's secret identity. She might feel like she doesn't really know the whole of him. This could lead to her trying to find out more about Peter Parker, which could cause all sorts of problems. For instance, her investigations might draw the attention of Spiderman's enemies who are also interested in his true identity.
It's very likely that such a fanfiction exists. Fanfiction is a vast and diverse world where writers can let their imaginations run wild. Since Black Cat has her own motives and character traits, and Spiderman has his enemies and challenges, a scenario where Black Cat kills Spiderman could be an interesting exploration of betrayal, revenge, or a change in the status quo. There may be multiple versions of such a fanfiction, each with different interpretations and story developments.
In such fanfics, the Black Cat is often depicted as a very alluring and mysterious character. She might be more assertive in her relationship with Spiderman, especially if the 'pegs' concept implies some sort of power dynamic.
Maybe in the fanfiction, they decide to start a family. But there are complications due to their superhero lives. They have to find a way to keep their future child safe from their enemies while still being superheroes. This could involve building a secret hideout just for their family.
One possibility is that it could start with Spiderman finally realizing his deep feelings for Black Cat. They might have a small, secret wedding to avoid attracting too much unwanted attention. Their friends from the superhero and villain world might have mixed reactions. Some would be happy for them while others might be worried about how this union could change the balance of power in the city.
One spiderman black cat story could be that Black Cat often teases Spider - Man. She is a skilled thief and sometimes she steals things just to get Spider - Man's attention. For example, she once stole a valuable diamond from a museum. Spider - Man had to chase her all over the city. During the chase, Black Cat would use her acrobatic skills and charm to try and throw Spider - Man off. But in the end, Spider - Man always manages to either catch her or at least stop her from getting away with the loot.