To write a good Barry Iris fan fiction, do some research on the show's lore. Know the rules of the Flash's powers, the history of Central City, and the relationships between the characters. This will make your story more believable. Then, just start writing. Let your creativity flow and don't worry too much about making it perfect at first. Edit later to refine your work.
There could be a fan fiction where Barry and Iris are on a time - traveling mission. They visit different eras in their past and future, which gives them a deeper understanding of their love and destiny. Along the way, they encounter old friends and foes in unexpected ways.
Love is a very common theme. Their relationship is at the core of many fanfictions. Another common theme is adventure. Since Barry is The Flash, fanfictions often include them going on adventures together. For example, fighting new villains or exploring new dimensions.
There's no way to tell just from the title 'barry and iris contraction fanfic' who the author might be. It could be a relatively unknown fan writer or someone within a specific fan community. You'd probably have to search fanfic platforms or relevant forums to find out.
Well, without having read the 'barry and iris contraction fanfic' directly, it could potentially be about a new development or a plot device that causes a contraction in their world or story. For example, it could be a new villain's power that shrinks their environment or limits their abilities, and how they deal with it as a couple.
In the comics, Barry Allen and Iris have a complex relationship. Sometimes they face challenges and separations, but ultimately, they often find their way back to each other.
A really interesting Barry and Iris fanfic could be a time - travel one. Maybe Barry accidentally travels to a time when Iris doesn't know him, and he has to win her heart all over again while also trying to find his way back to his own time.