One possible fanfiction could be about Spiderman and Black Cat teaming up to fight a new villain in the Web of Shadows. Maybe they have to overcome their own relationship issues while saving the city.
A plotline could be that the Web of Shadows starts to corrupt Black Cat, and Spiderman has to find a way to save her without hurting her. He might have to seek help from other superheroes or use some rare technology.
A fanfiction could focus on Black Cat's backstory within the Web of Shadows context. Maybe she has a secret past connection to the symbiotes that is slowly revealed as she battles against them. This would add depth to her character and her role in the story.
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 the fanfiction, the Spiderman kiss with Black Cat might happen during a chase. Black Cat is running from some bad guys, and Spiderman swoops in to save her. As he does, their eyes meet, and there's an instant attraction. Their lips touch briefly in the heat of the moment, leaving both of them a bit stunned and making their relationship more complex as they now have this newfound physical and emotional connection.
In many Spiderman fanfictions involving Black Cat, jealousy can be a great plot device. It could be that Black Cat gets jealous of another character who is getting close to Spiderman, perhaps Mary Jane. This might lead to some tense moments between her and Spiderman. Black Cat might start acting out, trying to get Spiderman's attention back in more extreme ways.
One possible fanfiction could be that their son inherits Spiderman's powers and Black Cat's agility and thieving skills. He might struggle with the moral dilemma of using his powers for good like his father or for more self - serving purposes like his mother. He could start off as a bit of a rebel, using his powers to have fun and get into minor mischief, but eventually realizes the greater good he can do in the city.
A plot could be that Black Cat gets infected by a different kind of symbiote that gives her new powers. She has to learn to control these powers while also dealing with the fact that Spider - Man is a bit suspicious of her new abilities.
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.