One plot idea could be that the reader is a new recruit in the Young Justice team. Nightwing takes the reader under his wing to train them. As they train together, they start to develop feelings for each other. Along the way, they face a common enemy that tries to divide the team, and they have to work together to overcome it and in the process, their relationship deepens.
The reader could be a civilian who gets caught in the middle of a Young Justice mission. Nightwing saves the reader and feels responsible for their safety. He then has to protect the reader from the villains who are after them because they witnessed something they shouldn't have. During this time, they get to know each other better and a romantic relationship begins to form. For example, they might hide out in an abandoned building and have deep conversations while waiting for backup.
One possible title could be 'Nightwing and Reader: A Young Justice Bond'.
They could be on a training exercise together that turns into a real threat situation. For example, they are in a simulated battle scenario but then an actual group of villains attacks the training ground. Nightwing and Artemis have to quickly shift from training mode to combat mode. Nightwing uses his acrobatic skills and martial arts training, and Artemis uses her bow and arrows. They fight side by side and protect each other throughout the chaos.
One possible plot could be Nightwing joining Young Justice as a mentor. He'd bring his years of experience from being Robin and working with Batman. He could train the young heroes in new combat techniques and also teach them about stealth and detective work.
Maybe the fanfiction could center around Nightwing trying to hide his scars from the team at first. He's afraid that they'll see him as weak or damaged. But as the story progresses, he realizes that his scars are a part of him and that his team will accept him no matter what. Along the way, he has to face an enemy who specifically targets his scars in combat, making him confront his fears head - on.
One idea could be a story where Nightwing has to train Robin in a new and dangerous combat technique. They could face off against a powerful new villain in Young Justice that specifically targets their mentor - protégé relationship.
Maybe there's a situation where a powerful artifact is discovered that has a connection to both Nightwing's family and Starfire's alien heritage. They embark on a quest to understand the artifact's true nature. During this journey, their relationship grows stronger as they face various obstacles and puzzles.
A possible plot could be that Slade has some information that Nightwing desperately needs. In exchange for this information, Slade makes Nightwing go through a series of dangerous trials. As Nightwing progresses through these trials, he starts to understand more about Slade's motives and his own limits. This could also involve some flashbacks to their previous encounters and how they have shaped their relationship.
A plot could revolve around a misunderstanding between Nightwing and Starfire. For example, Starfire might misinterpret one of Nightwing's actions as him not trusting her. This could lead to some tension between them at first, but then they would have to work through it and in the process, their relationship could grow stronger. They could have deep conversations about their feelings and past experiences that bring them closer together.
One idea could be that Nightwing has to train the Young Justice team in some new combat techniques. Maybe there's a new threat in Gotham that requires their combined skills to take on. Another could be a time - travel plot where the Young Justice team gets sent back in time and meets a younger Nightwing, and they have to work together to get back to their own time. Or perhaps Nightwing goes undercover in Young Justice to investigate a mole, leading to a lot of mystery and drama within the team.
The theme of heroism also stands out. They fight crime together in Gotham as part of Young Justice. Their actions not only protect the city but also strengthen their relationship. They inspire each other to be better heroes and support each other through the challenges of being a hero.