Well, you could start by imagining unique adventures for the dragon child. Maybe it discovers new powers or makes special friends.
One way could be to have the dragon child go on a quest to find its true identity or purpose. Maybe it has to overcome some sort of curse or evil force to do so. That could make for an engaging plotline.
You could give the half-dragon unique powers and struggles. Maybe it has trouble fitting in with either dragons or humans.
Well, you could have the main character learn self-defense skills or find a supportive friend to stand up with them.
You could start by considering how the pregnancy affects Astrid's character development and her relationship with Hiccup. Maybe explore how the other characters in the story react and support her.
You could start by imagining a unique backstory for Hiccup's reincarnation. Maybe he retains some memories from his past life or gains new powers.
When dealing with mature content in How to Train Your Dragon fanfiction, you need to consider the age group of your potential readers and the terms of service of the platform you're posting on. Also, be tasteful and avoid going overboard.
Avoid it completely. Such content is not appropriate and should not be engaged with.
Well, including such explicit content is not a good idea. Fanfiction is better when it explores character development, new adventures, or expands the world of the original work in a meaningful way without going into such inappropriate territory.
You could have other characters care for him, like Astrid bringing him medicine and soup.
It depends on your story's plot. You could make them have contrasting personalities to add depth.
Handling lemon themes in How to Train Your Dragon fanfiction requires a delicate balance. You should respect the source material, consider your audience, and avoid going against the established lore and values of the franchise.