Well, you really shouldn't go there. Writing smut fiction about these characters goes against the intended nature of the story and can cause issues. It's better to focus on positive and creative aspects of the How to Train Your Dragon world.
I wouldn't recommend creating such smut fiction. It's not appropriate and could be disrespectful to the original characters and the franchise.
I think it's best to avoid it. Such content is not in line with the spirit of the series and might even get you in trouble. Stick to more wholesome and respectful ways of expressing your creativity within this universe.
Handling this type of fanfiction is a bit complex. First, make sure it adheres to legal and ethical standards. Then, think about how it aligns with the tone and themes of the 'How to Train Your Dragon' universe. And always be mindful of the potential impact on fans' perception of the original work.
Maybe it's because they face some big challenges or losses in their adventures that weigh heavily on them.
You can search on popular comic websites or platforms using relevant keywords. Many fan art and comic creators share their work there.
You could start by imagining new adventures for them. Focus on their relationship and character growth.
Often, the betrayal could stem from a secret Astrid keeps that accidentally harms Hiccup's interests or trust. Maybe she makes a decision without consulting him that has negative consequences for him.
They are quite popular. Many fans love creating and reading stories about their adventures and relationship.
One possibility could be that they face challenges in protecting their unborn child from the threats in their dragon - filled world. For example, they might need to find a safer place to raise the baby, away from the more dangerous dragons or villains. Maybe they also struggle with how to balance their duties as dragon riders with the upcoming responsibilities of parenthood.
It's all about imagining their adventures in a contemporary setting. You can have them dealing with modern problems while still retaining their dragon-training skills.
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.