In this fanfiction, it could be that Black Cat's pregnancy causes her to lose some of her agility and skills temporarily. Peter has to train her in new ways to defend herself while she's pregnant. Also, they could face challenges from the public. Since Peter is a well - known superhero, news of his relationship with a pregnant Black Cat might spread. Some people could support them, while others might think it's a bad influence on Peter's superhero image. They would have to deal with this public scrutiny together.
One idea could be that Peter Parker has to balance his superhero duties with taking care of a pregnant Black Cat. He might start to build a more stable home environment for her, like getting a new apartment. Another could be that the pregnancy reveals new threats, as villains might try to target her. Maybe they think they can use the unborn child as leverage against Spider - Man.
His life would change in many ways. First, he would need to be more present at home. No more staying out all night as Spider - Man. He would have to ensure Black Cat has proper medical care, which might mean finding a doctor who can be discreet about their identities. Also, he'd need to start thinking about finances. Babies are expensive, and he can't rely on his meager reporter salary alone. He might have to take on more side jobs or find ways to earn more money legally. Emotionally, he'd be a bundle of nerves, constantly worried about the safety of Black Cat and the unborn child.
One possible plot could be that the Black Cat licks Peter Parker as a form of affection, and this becomes a unique way for her to show her feelings in a world where their relationship is full of secrecy and danger. Maybe it's a sign of trust she's building with him.
A popular fanfiction is 'Married to the Black Cat: Peter's New Chapter'. This story focuses on Peter's perspective of being married to Black Cat. It shows his initial apprehensions and how over time he grows to fully embrace their relationship, all while facing various villains and challenges that come their way.
One idea could be that Naruto somehow gets transported to a world where the Black Cat characters exist. He could team up with Train Heartnet and use his ninja skills along with Train's gun - slinging abilities to take on a new powerful enemy.
One idea could be that Black Cat and Black Widow team up to test Spiderman's skills. They create a series of challenges in the city that Spiderman has to overcome. Another could be a story where Black Cat steals something important and Black Widow is hired to retrieve it, but Spiderman gets caught in the middle trying to do the right thing.
A plot could involve a strange device that affects their powers. Spiderman and Black Cat have to figure out how to reverse it while also dealing with their relationship. For example, the device could make Black Cat's bad luck powers go out of control, and Spiderman has to use his wits and strength to keep them both safe and also find a way to fix the situation. This would add an interesting layer to their relationship as they rely on each other more.
One plot idea could be that Black Cat steals a powerful artifact which has the potential to disrupt the balance in New York. Spiderman has to team up with her reluctantly to stop the chaos it might cause. Along the way, they start to understand each other's motives better and develop a complex relationship.
One plot idea could be that Catwoman and Black Cat team up to steal a valuable artifact that has been causing chaos in the criminal underworld. They start off as rivals, each with their own motives, but as they work together, they begin to respect and even like each other.
One plot idea could be that Black Suit Spider - Man and Black Cat team up to take on a new super - villain in the city. This villain could have a power that is linked to some dark magic, which makes the black suit of Spider - Man react in strange ways, adding an element of mystery to the story. Another idea is that Black Cat steals something valuable that she thinks is just a regular jewel, but it turns out to be an alien artifact. Black Suit Spider - Man has to convince her to return it before it attracts unwanted alien attention to Earth.
In a more fantastical plot, the train itself is alive. The black cat is its guardian. Eve is a dreamer who enters the train's world by accident. The cat has to guide Eve through the different realms of the train, which are full of strange creatures and magical landscapes. And Eve has to learn to trust the cat to find her way back home.