One possible plot could be that Poison Ivy discovers a strange seed that has the potential to overtake Gotham with mutated plants. Batman, initially suspecting Ivy's malicious intent, later realizes she's trying to control the seed's power. As they work together, their relationship matures in unexpected ways. They face challenges from other villains who want to use the seed for their own evil purposes.
They could start with mistrust. Batman might think Ivy is up to no good with the seed. But as they learn more about the seed's origin and potential danger, they begin to communicate more. For instance, they have serious discussions about how to handle the situation. This shows a more mature side of their relationship as they put aside their initial differences.
One possible plot could be that Poison Ivy initially tries to use her powers on Batman to further her own environmental goals. But as she spends more time with him, she starts to see his good side and truly falls in love. Batman, on the other hand, begins to understand Poison Ivy's motives more deeply and they decide to get married, vowing to work together for a better Gotham that respects nature.
One idea could be that Poison Ivy creates a new type of plant that can influence Batman's mind, making him question his own moral code. This could lead to a series of intense internal struggles for Batman as he tries to resist while also dealing with his feelings for Ivy.
One possible plot twist could be that the kiss is part of a ploy by Poison Ivy to control Batman's mind. Maybe she has a new strain of her pheromone - based powers that she's testing on him through the kiss. However, Batman being Batman, he has some sort of antidote or mental resistance that he activates mid - kiss, which then turns the tables and he uses the situation to get information from her instead.
When writing a Batman and Poison Ivy mature fanfic, begin with researching their backstories. This will help you create a believable setting for your story. Then, think about the mature elements you want to include, whether it's a more complex emotional relationship or a situation that challenges their beliefs. Don't forget to develop their characters further as they interact in this new context. For example, you could have Poison Ivy trying to convert Batman to her view of protecting nature in a very intense and personal way.
In a fanfiction where Batman saves Poison Ivy, perhaps Poison Ivy is framed for a crime she didn't commit. Batman, being the detective he is, discovers the truth. He has to save her from the police as well as the real criminals who set her up. This could lead to an alliance between them for a short time as they work together to expose the real villains and clear Ivy's name.
In a fanfiction, perhaps Poison Ivy hypnotizes Batman to get revenge on some of Gotham's industrialists who are polluting the city. She could make Batman target their factories and disrupt their operations. Batman, under the hypnosis, would use his skills in a way that serves Ivy's environmentalist goals. He might even start to see the value in Ivy's cause, which would create an interesting internal conflict for him when he eventually breaks free from the hypnosis.
In a fanfiction plot, the kiss could be a result of Poison Ivy's attempt to break Batman's will. She's always seen him as a symbol of the establishment that she opposes. By kissing him, she hopes to make him more pliable. However, instead of breaking him, the kiss actually awakens a different side of Batman. He starts to understand Poison Ivy's cause more deeply, not in a way that he agrees with her completely, but in a way that makes him more empathetic. This new understanding could lead to a more complex relationship between them, with both of them constantly trying to outwit each other while also being drawn to each other on an emotional level.
One possible plot could be that Poison Ivy hypnotizes Batman to make him see Gotham as a utopia of nature. She could use her powers to make him believe that the concrete jungle should be replaced with a real jungle, and Batman, under her spell, starts to work against the city's infrastructure in an attempt to 'green' it. This would put him at odds with his usual allies like Commissioner Gordon and Robin, who would be very confused about his sudden change in behavior.
Well, the plot could start with Poison Ivy devising a plan to seduce Batman in order to get him to stop interfering with her environmental plans. She might use her charm and her plant - based powers to create alluring scenarios for Batman. Maybe she traps him in a garden filled with intoxicatingly scented flowers that make him more susceptible to her advances.