Well, they might have a deep conversation about their different views on the world. Eren could try to convince Zeke of his more radical approach to saving the Eldians, while Zeke might push back with his own ideas of euthanasia for the Eldians. It could be a very tense encounter.
They could start to plan a strategy to deal with the Marleyans together. Since both have their own experiences with Marley, they might come up with a complex plan involving Titan powers and political manipulation. For example, using Zeke's position as a Marleyan weapon and Eren's influence within Paradis.
In this fanfiction scenario, Eren and Levin meet in the underground. It could be that the underground is a place where outcasts or those with special knowledge gather. Eren, with his strong will and determination, and Levin, with his own unique skills or knowledge, cross paths. They might start off on the wrong foot, with misunderstandings. But as they spend more time together, they discover that they can learn from each other. Eren could learn new ways of thinking from Levin, and Levin could be inspired by Eren's tenacity. And together they could embark on a journey to uncover secrets that could change their understanding of the entire world.
Their relationship might develop slowly. At first, they'd be suspicious of each other. But as they face difficulties in the underground, like escaping from traps or fighting off strange creatures, they'd start to rely on each other. Eventually, they could become friends who trust and support one another.
One possible plot could be that the kids somehow get transported back in time. Maybe through some magical or mysterious power. They meet Eren and Levi before they've been hardened by war. Eren might be more idealistic and naive, while Levi could be less jaded. The kids could learn about their pasts, their hopes, and dreams, and perhaps even change the course of future events by influencing them in some way.
One common theme could be the exploration of unexpected relationships. Since mpreg is involved, it often delves into how the characters deal with the non - traditional situation of male pregnancy. For example, how the relationship between Harry and Draco might change due to this new development with Zeke in the mix.
Pulp Fiction is a complex and iconic movie with a lot of memorable characters. However, Zeke and Zeb are not characters that are typically associated with it. It's possible that there is some sort of misinformation or a very niche interpretation where these names are related, but in the general understanding of the movie, they don't exist within its world.