In the fanfiction, they could be paired up for a volunteer project in a different part of the city. There, they encounter a new group of people and a new culture. Flash's brashness and Peter's more reserved nature create both comical and meaningful situations. They have to adapt to each other and the new environment. Through this shared adventure, they learn about each other's strengths and weaknesses and develop a more nuanced relationship.
One unique way is if Flash has a family problem, like his parents are getting divorced. Peter, being the empathetic person he is, tries to help Flash through it. Flash is initially resistant but then realizes Peter's genuine kindness. This experience changes their dynamic as Flash becomes more vulnerable around Peter, and Peter becomes someone Flash can trust. They then form a deeper connection that goes beyond their typical school - based interactions.
A unique way to develop their relationship is to have Peter lose his powers for a while. Mary Jane then has to step up and be the protector in some situations. This role reversal would make them see each other in a new light. She could use her wits and charm to get them out of trouble, and Peter would learn to rely on her in a different way. It would strengthen their bond and show that their relationship is not just based on Peter being the hero.
Their relationship could be developed uniquely by having them communicate telepathically due to an accident in the lab. This new form of connection would allow them to understand each other on a deeper level, and they could use it to their advantage when fighting crime. For example, they could plan their attacks without the villains suspecting.
They could start with a common goal. For example, if there's a school competition, they have to work together towards winning it. This forces them to communicate and understand each other better. As they interact more, Flash might start to respect Peter's intelligence and kindness.
A plot could involve a school competition where both Flash and Peter are competing. Flash is overconfident, while Peter is underestimated. However, Peter uses his smarts and Spider - Man - like agility (in a non - obvious way) to start winning. Flash gets jealous at first but then realizes that he can learn from Peter. This leads to a series of interactions where they learn to respect and support each other, and their relationship evolves from antagonistic to friendly.
Their relationship can be developed through shared challenges. For instance, if they both get caught in a dangerous situation not related to Peter's Spider - Man activities, like being trapped in an abandoned building during an earthquake. They have to rely on each other to survive, which breaks down some of the barriers between them.
The relationship could be developed through shared secrets. For instance, the OC could have a secret past related to a meta - human experiment that they don't want anyone to know. Barry discovers this secret and instead of judging, he helps the OC come to terms with it. This mutual trust and understanding can deepen their relationship. Another way is if the OC has a special interest or hobby, like painting portraits of Central City's heroes. Barry could be the subject of one of these portraits, and through this, they start to have deeper conversations about their hopes and fears.
Their relationship could be developed through shared secrets. For example, if Peter reveals his identity to Harry, it could create a deeper bond. They could then train together and learn from each other's strengths and weaknesses.
Maybe in the fanfiction, Flash discovers Peter's identity in a very unexpected way, such as seeing Peter's Spider - Man suit by accident. He then has to decide whether to keep the secret or not. He might struggle with his own jealousy towards Peter and the newfound knowledge. If he decides to keep it a secret, it could lead to an unlikely friendship between them, with Flash helping Peter in small ways without Peter knowing it's him.
A unique way to develop their relationship could be through a shared creative project. Let's say they both start working on a new type of web - fluid that could have different applications in their crime - fighting. During the process, they argue about the best way to do things, but also learn to respect each other's ideas. This joint effort brings them closer together, and they start to see each other not just as fellow superheroes, but as friends and potentially more.
Their relationship can be developed by showing more of their daily lives together. For example, Peter cooking breakfast for Mary Jane on a lazy Sunday morning. Also, by having them face relationship - specific challenges like when Peter has to cancel dates because of Spider - Man duties. They can also grow closer through shared hobbies, like going to the movies together or reading the same books.