Some fanfics focus on the challenges they face as individuals and how they support each other through those. For example, Casey dealing with his past traumas and Brett being there for him, or vice versa. There are also stories that explore their friendship evolving into something more romantic, with all the cute and angsty moments that come with it.
Another theme is professional growth. Fanfics might show how they learn from each other and improve their skills as firefighters. For example, Casey might teach Dawson a new technique for handling a certain type of fire, and Dawson could share her insights on dealing with victims.
Their relationship would likely become more intimate and serious. With the pregnancy, they'd have to rely on each other more. They might start having deeper conversations about their future together, like where they'll live and how they'll raise the child.
You can try looking on fanfiction websites such as Archive of Our Own (AO3). There are a large number of fan - created stories there, and you can search specifically for 'Chicago Fire Brett and Casey fanfic'.
Maybe in the fanfiction, the pregnancy could be a result of a one - time passionate moment between Brett and Casey. As they deal with the news, they start to plan for their future together. Brett might worry about how being a mother will affect her career as a paramedic, while Casey could be thinking about providing a stable home for his new family. Their friends at the firehouse could either be very supportive or there could be some drama among them regarding the situation.
Another theme is the emotional impact on the team. Casey is an important part of the 'Chicago Fire' crew. So when he's hurt, the others might feel guilty, worried, or be in denial. Fanfictions often explore these complex emotions within the team members. They might show how Severide, for instance, tries to be strong for Casey but is secretly very worried. Also, the theme of friendship and support is big. The team comes together to support Casey, whether it's bringing him food during his recovery or just being there to listen to his fears.
One common plotline is Casey's struggle with his physical recovery. He might have to deal with intense pain and rehabilitation. For example, he could be frustrated with his slow progress in getting back to his firefighting duties. Another plotline could involve the emotional impact on his friends and colleagues. They might feel guilty for not being able to protect him better. Also, there could be a romantic sub - plot where his significant other is especially worried and their relationship is tested during his recovery.
One possibility is that Casey's injury makes him more determined. He could start training secretly while still recovering to prove he can come back stronger. This would show his strong will.
There might be a fanfic that focuses on their early days at the firehouse. It could explore how they first met, the initial impressions they had of each other, and how they gradually became the close friends and reliable colleagues that we see in the show. Maybe there were some misunderstandings at first that added drama to their relationship development.
In fanfic about Casey being injured in Chicago Fire, he might face various challenges. Fellow firefighters could rally around him. Maybe they'd struggle to keep the team spirit high while Casey is recovering. For example, Severide might take on extra responsibilities and feel the pressure.
One great fanfic could be about Casey and Dawson working together on a particularly difficult rescue mission. They face many challenges and in the process, their bond deepens. Their teamwork and mutual respect shine through as they save lives.