You could also create fanfiction about their future. Maybe they start a new project together, like building a school for demigods or leading a mission to unite different groups of mythical creatures. This allows you to be creative while still keeping the characters in a positive and appropriate light.
Another alternative is to explore their friendship and how it deepens over time. You can write about the small moments they share, like late - night conversations under the stars, or how they support each other during tough times at school or in their hero training. This helps to develop their relationship in a more nuanced and respectful way.