The setting of an Ichika x Houki fanfic can greatly enhance the story. If it's set in a school environment, there are many opportunities for them to interact. They could be in the same class or participate in school clubs together. Maybe there's a school competition where they have to work as a team. This would not only bring them closer but also show how they complement each other's skills. Additionally, the fanfic could introduce other characters who either support or oppose their relationship, adding more complexity to the plot.
I don't know for sure. The ending of such a manga can be quite unpredictable and might not have been revealed yet. You could try discussing it with other fans to get their speculations.
In a fanfiction, Ichika and Houki could have a moment where they confess their feelings for each other. Maybe it starts with a simple misunderstanding. Houki sees Ichika with another girl and gets jealous. But then Ichika clarifies that he only has eyes for Houki, leading to a very sweet and heartwarming confession scene.
One possible fanfiction could be about Ichika and Chifuyu going on a training mission together. They face some unexpected challenges during the mission, which forces them to rely on each other more than ever. This could lead to a deeper understanding and bond between them.
I'm not really sure if they end up together. Different people might have different interpretations. Maybe you can dig deeper into the manga and form your own conclusion.