One scenario in the fanfiction could be that Batman gets jealous when he sees Catwoman flirting with a rich businessman during one of her heists. He might start to question her motives and their relationship. This jealousy could cause him to act out of character, perhaps being more aggressive or possessive towards Catwoman than he normally would be. And Catwoman, being the independent character she is, would not take kindly to this sudden change in Batman's behavior, leading to a rift between them that would be interesting to explore in the story.
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.
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.
In the Injustice 2 Batman ending story, Batman manages to defeat Superman. He restores order to a world that has been torn apart by the chaos of the Injustice regime. With Superman out of the way, Batman is able to start rebuilding society, bringing back justice and the rule of law. He also has to deal with the remaining super - villains and ensure that they are locked away safely.
Well, it is indeed a classic. Catwoman and Batman's love story is not your typical love story. They come from different worlds. Batman is the Dark Knight, dedicated to justice, while Catwoman is a cat burglar. But their attraction to each other is undeniable. Their love is often a struggle, as they have to deal with their own moral compasses and the expectations of Gotham. This makes their love story one of the most interesting and enduring in the Batman franchise.
The Penguin often makes an appearance. He can add an extra layer of chaos and villainy to the story. His devious plans can either get in the way of Batman and Catwoman's relationship or be a catalyst for them to work together more closely.
There's a fanfic called 'Midnight Rendezvous'. In this one, the setting of Gotham at night is vividly described. The encounters between Batman and Catwoman are filled with tension and passion. The writer has a unique style of writing their dialogues, which makes it a very engaging read.
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.
The 'Batman: Year One' storyline also features great Batman and Catwoman moments. It sets the foundation for their relationship in the new Batman universe. Catwoman is shown as a cunning and alluring figure. Batman's first encounters with her here are memorable as he tries to understand her motives while also dealing with the chaos of Gotham's underworld. It's a classic that shows their early interactions.
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.