It could develop through mutual respect. Despite their differences, they see each other's skills. Damian respects Jason's tenacity and Jason sees Damian's talent. So, they start to work together more often.
The relationship between them might start off rocky. Damian is used to being in control and having a certain way of doing things, while Jason has his own methods. However, when they meet, they are forced to interact. Maybe they are both after the same piece of evidence related to a mystery in Gotham. As they search for it, they start to see the good in each other. Damian realizes that Jason's more unorthodox ways can be effective and Jason sees that Damian has a strong sense of justice. This realization helps their relationship develop into a more collaborative and friendly one over time.
Initially, Jason and Damian might be reluctant to trust each other. However, as they face challenges on the run, like escaping from pursuers or finding food and shelter, they'd be forced to work together. This would gradually lead to a deeper understanding. Damian might learn from Jason's more street - smart ways, and Jason could gain a new appreciation for Damian's tenacity. Their relationship would transform from one of suspicion to a sort of brotherly bond.
Often, it starts with curiosity. Damian may be curious about his grandfather he never met. Thomas, on the other hand, is intrigued by this young Wayne. As they interact more, respect grows. Thomas sees Damian's potential and Damian looks up to Thomas as a part of his family's great history.
They might initially clash due to their different personalities and past experiences. Damian is more disciplined and trained from a young age, while Jason has a more rebellious streak. In the fanfiction, they could start off fighting but then gradually come to understand each other as they realize they both have a common goal of protecting Gotham in their own ways.
One great 'Jason Todd and Damian Wayne' fanfiction is 'Brothers in Arms' which explores their complex relationship in a really interesting way. It doesn't have any lemon elements though. Another one could be 'The Dynamic Duo Redux' where their characters are well - developed and the story focuses on their adventures together. There are not many lemon fanfictions about them that are widely known, as their relationship is often depicted in a more platonic or brotherly context in most mainstream works.
One possible scenario in this fanfiction could be that Jason Todd and Damian Wayne initially have a tense encounter due to their different upbringings and personalities. Jason, with his more rough - edged past, might be skeptical of Damian, who was trained in the League of Assassins. Talia could act as a mediator or perhaps have her own motives for bringing them together. Maybe she sees potential in their combined skills for some greater purpose she has in mind.
It could develop quickly. They might share a glance across the cafeteria and feel an instant connection, and from there start hanging out right away.
Since there aren't a ton of these types of fanfictions, but if there were, a common theme might be the exploration of their forbidden or unexpected attraction. Given their complex relationship in the original comics, it could be about how they overcome their initial animosity to develop feelings for each other.
Jason Todd, who was brought back from the dead and has a bit of a grudge against the Bat - family at times. And Damian Wayne, who is trying to prove himself worthy in the family. In this fanfiction, their interactions drive the story forward as they are the central focus.
One common theme is redemption. Jason has his troubled past as the Red Hood, and in many fanfictions, Damian helps him find a path towards redemption. For example, in some stories, they work together on a mission that makes Jason see the value of his place in the Bat - family again.
Jason and Damian could have a battle of wits at first. Since Jason has his own sense of justice which has been shaped by his traumatic experiences, and Damian has the strict discipline of the League of Assassins. Talia might be torn between the two, as she cares for Damian as her son and has a certain relationship with Jason as well. Maybe she tries to make them see each other's points of view.