A fanfic could show Batman proposing to Catwoman in a very private moment. Maybe after a long conversation about their future, he decides it's time. He doesn't make a big show of it, but rather, in a quiet corner of the Batcave, he tells her how much she means to him and asks her to be his wife. Catwoman, who has seen the real Batman behind the mask, would accept, knowing that they can face any challenges together as a couple.
It might start with Batman planning the perfect moment. He'd choose a place that holds special meaning for them, like the alley where they first met. He'd probably have a simple yet elegant ring, something that suits Catwoman's style. Then, in his deep, gravelly voice, he'd say something like 'Selina, you've been the one constant in my life of chaos. Will you marry me?'
She might be very surprised at first. After all, Batman is not one to show his emotions so openly. But then she would likely be overjoyed. She has deep feelings for Batman too, and this proposal would be a confirmation of their complex relationship.
Well, at first, it might be a bit of a shock to their relationship. There could be some tension as they adjust to the idea. But as time goes on, they would grow closer. Batman, who is used to being alone in his fight, would now have a family to consider. He would become more empathetic towards Catwoman's needs during the pregnancy. Catwoman, who has always been a bit of a free spirit, would have to start thinking about stability. Their relationship would transform into a more domestic - like partnership, with them discussing things like baby names, nursery decorations, and how to keep their child away from the dark side of Gotham while still teaching them to be strong and just.
To write a good 'Batman and Catwoman Fanfic', you need to get the setting right. Gotham City should be a character in itself. Describe its dark alleys and tall buildings. Also, don't be afraid to add some new elements to their backstories. For example, what if Catwoman had a different reason for becoming a thief? And make their interactions full of tension, whether it's physical combat or a battle of wits.
They would probably raise their baby with a mix of Batman's discipline and Catwoman's fun - loving nature. Batman would teach the baby about responsibility and protecting the weak, while Catwoman would show it how to enjoy life and be a bit more carefree.
A popular 'Batman and Catwoman Fanfic' is 'The Thief and the Dark Knight'. It's set in an alternate Gotham where Catwoman is on a mission to steal a precious artifact, and Batman has to stop her while also dealing with his growing feelings for her. There are also some really good ones on Archive of Our Own, like 'Gotham's Lovers' which shows their relationship from the perspective of the citizens of Gotham.
A fanfic could explore what would happen if Catwoman found out Batman's true identity before he was ready to reveal it. Maybe she uses this knowledge to try and protect him from a threat that is specifically targeting Bruce Wayne, and in the process, their relationship takes an unexpected turn.
Their relationship could start with Catwoman's yandere feelings being a bit of a shock to Batman. He's used to her as a cat burglar and occasional ally, but this new possessive side makes him wary. However, as time goes on, he might start to understand the root of her feelings and try to help her control her yandere tendencies.
One popular theme is their romantic relationship. Writers often explore how they fall in love despite being on different sides of the law. Another is their team - up against other villains. They both have unique skills, and a fanfic could focus on how they combine their abilities to take down a powerful foe. Also, there are stories about Catwoman's backstory and how Batman comes to understand her more deeply through that.
A way to develop their relationship in this type of fanfiction is through joint parenting. They might have different approaches to raising their kids. Batman could be very strict about discipline and training, while Catwoman might be more lenient and focus on teaching the kids about the importance of freedom. Through these differences, they learn to understand each other better and grow closer as a couple. Also, they could face external threats to their family which forces them to rely on each other more, strengthening their bond.
For the best man, Robin could be a great choice. He's Batman's sidekick and has been through a lot with him. As for the maid of honor, Poison Ivy might be an interesting pick. She has a complex relationship with Catwoman, and it would add some drama and intrigue to the wedding party.