It might develop gradually as Levi helps Eren grow. He would teach Eren things like how to fight, how to be self - sufficient. As Eren learns from Levi, he would start to idolize him. And Levi would see Eren as someone he needs to protect and shape into a good person. Over time, they would become closer, almost like a real father - son duo.
One possible plot could be that Levi takes on the role of a father figure to baby Eren. He might teach Eren about the world they live in, the importance of survival skills, and values like loyalty and courage. For example, Levi could show Eren how to navigate the dangerous terrain outside the walls, all while protecting him from potential threats.
To develop their relationship realistically, let them communicate. Have them have conversations about their pasts, their goals. Eren might talk about his family and his drive to avenge them, and Levi could share some of his own traumas from his past. This would create a deeper understanding between them. Also, small acts of kindness like Levi patching up Eren's wounds after a fight or Eren getting Levi his favorite tea could strengthen their bond.
Levi would probably be a very strict parent. He's used to discipline and order, so he'd likely enforce rules strictly. Eren, on the other hand, might be more lenient and encourage the baby to be adventurous and follow its heart.
In married life, Eren could develop a more domestic side. She might start cooking for Levi, which is something new for her. Levi would have to adjust to having someone so close. He would learn to share his thoughts and feelings. He might also become more protective of Eren, especially if there are threats to their relationship or their lives. Their marriage would be a journey of mutual growth and understanding.
They could start off seeing the baby as just another supernatural problem to deal with. However, as the baby shows signs of innocence and dependence on them, they gradually become more attached. Sam might start reading bedtime stories to the baby, and Dean would teach it basic self - defense skills as it grows older. Their relationship would be a mix of love, protectiveness, and the responsibility of guiding this powerful being.
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.
In Levi x Eren fluff fanfics, their relationship is often painted with a lot of emotional depth. They are not just comrades, but something more. There are scenes where they look out for each other's well - being. For instance, when Eren is injured, Levi is the first one by his side, showing his concern not just as a captain but as someone who cares deeply for Eren. And Eren, in return, respects and admires Levi, and this is shown through his eagerness to learn from Levi and his small acts of kindness towards him.
First, you need to understand the characters well. Levi is known for his strict and stoic nature, while Baby Eren has that potential for great power and a certain naivete. Then, create an interesting plot. It could be something like Eren being in danger and Levi having to save him in a creative way.
It could develop with a lot of mutual understanding. Levi, being the strong but reserved type, would gradually open up more to Petra. And Petra would be there to support him through his nightmares. Their relationship might also grow as they learn to work together in new ways, like running a small business in their post - Survey Corps life.
One idea could be a story where Levi and Eren are on a dangerous mission together. They start off not getting along well due to their different personalities. Levi is strict and methodical while Eren is impulsive. But as the mission progresses, they gradually learn to understand and rely on each other. For example, Eren might save Levi from a Titan in a moment of quick thinking, and Levi in turn teaches Eren some crucial combat skills.