One plot idea could be that Poison Ivy kisses Robin as part of a trap. She might be trying to manipulate him into doing something for her, like stealing something from Batman or leading Batman into a dangerous situation.
Well, one possibility could be that Poison Ivy, with her allure and plant - based powers, somehow crosses paths with Supergirl. Maybe she kisses Supergirl as a form of manipulation. She could be trying to use Supergirl's powers for her own environmental - protection - gone - wrong schemes. For example, she might want Supergirl to help her spread some kind of plant that could overtake a city, thinking it would make the world more 'green' but in reality would be a disaster.
There are definitely some interesting ones. Some fanfictions might explore a more romantic side of their encounter, while others could be more about Poison Ivy using her kisses for her own devious plans against Robin. It really depends on what kind of story you're looking for.
One possible plot could be that Robin is on a mission to stop Poison Ivy from one of her eco - terrorist acts. But during their encounter, he realizes that there is more to her than just being a villain. They start to have a conversation, and in a moment of unexpected connection, they share a kiss. This kiss could then lead to Robin questioning his own views on good and evil and how complex the situation really is.
One idea could be that Poison Ivy kidnaps Robin to use him as a bargaining chip against Batman. Maybe she wants Batman to stop interfering in her environmental plans. So she holds Robin in her lair, which is filled with all kinds of dangerous plants.
Well, a plot might involve Poison Ivy falling in love with Robin in a strange way. She tries to seduce him not just for her own gain but because she actually develops feelings. Batman, of course, sees this as a major threat and tries to separate them. Meanwhile, Poison Ivy's plants start to act out in strange ways due to her mixed emotions. Some plants become protectors of Robin while others are still under her full control and are used to attack Batman. This would create a complex dynamic between the three characters.
One possible plot could be that Naruto is on a mission and gets transported to Poison Ivy's world. He has to figure out how to get back while dealing with Poison Ivy's attempts to use him for her own ecological goals. Maybe she sees his chakra as a new form of energy she can harness.
Maybe the kiss is a part of a mind - control scheme by Poison Ivy. She kisses Robin to make him do her bidding, like stealing something from Batman or leading the other heroes astray. However, Robin's strong will could start to break the control as he realizes what's happening and then there would be a struggle between his loyalty to the good side and the influence of Poison Ivy's kiss.
Well, Batman could start a massive search for Robin. He'd use all his detective skills and his gadgets to track down Poison Ivy. Maybe he'd enlist the help of other heroes too, like Nightwing. And when he finally finds where Robin is being held, there'd be an epic battle between Batman and Poison Ivy.
In fanfiction, Robin and Poison Ivy could have an adversarial relationship. Robin is a hero who stands for justice and protecting the innocent, while Poison Ivy is often a villain with her own environmentalist motives that sometimes cross into criminal behavior. Their interactions might be full of tense moments as Robin tries to stop her from causing chaos.
One popular theme could be the struggle between Poison Ivy's environmental motives and her feelings for Batman. For example, in some fanfictions, her kisses might be a way to manipulate Batman into helping her with her ecological plans. Another theme could be the forbidden love aspect. Since they are on opposite sides in the Batman universe, their relationship is full of tension and the idea of a kiss adds to that allure. Also, the idea of Poison Ivy using her powers during the kiss, like her pheromones, to influence Batman's actions or his perception of her is quite common.