One idea could be that Batman and Catwoman kiss during a moment of truce while they are teaming up to take down a greater threat in Gotham. Maybe they are on a rooftop, surrounded by the chaos of the city below, and in that moment of shared purpose, their feelings surface and they share a passionate kiss.
Involving some internal conflict within the characters can enhance the story. Batman might be conflicted because of his code of ethics and his role as a protector of Gotham, while Catwoman has her own motives and loyalties. Their kiss could be a moment of surrender in the face of these complex emotions, which would draw the reader in.
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.
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.
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.
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.
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.
A scenario could be that Batman gets injured badly during a fight. Catwoman has to take care of him and in the process, she sees a more vulnerable side of him. This makes her realize that he's not just a symbol, but a man. Batman, on the other hand, sees her kindness and realizes that she has more depth than he initially thought. This changes their dynamic, with Batman being more open to her ideas and Catwoman being more committed to helping him in his mission.
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.