Well, for such a combination, you have to think about the characters' motivations and how their interactions would play out. Maybe explore how their differences could lead to interesting plot developments and character growth.
In this fanfiction, Hiccup and female Toothless usually have adventures and develop a deep bond through facing challenges together.
In many fanfictions, Toothless and Hiccup's relationship is explored through adventure and deepening emotional bonds. Sometimes, they face new challenges together that strengthen their connection.
I'd say it's a tricky topic. Fanfiction with such themes can be controversial and might not be suitable for all audiences.
The fanfic often explores their deep bond and adventures. You'll see them facing new challenges together and growing even closer.
Start by imagining unique adventures and interactions for them. Maybe have them face a new villain or explore uncharted lands together.
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.
You could have other characters care for him, like Astrid bringing him medicine and soup.
The fanfictions vary a lot. Some focus on their adventures together, deepening their bonds. Others might introduce conflicts to add drama.
You could focus on developing their relationship further. Maybe explore how they deal with growing up and the challenges that come with it. Also, think about adding some unique elements to the world they live in.
To write such a fanfiction, focus on building the chemistry between Hiccup and Toothless. Come up with unexpected situations that challenge their relationship and force them to grow closer. And don't forget to sprinkle in some emotional moments to make it really touching.