I'm not really into this specific concept, but in general, fanfiction often explores unique relationships. In this case, it might involve a very different take on the characters' bond, perhaps with Toothless in a more human - like form. However, it's a very niche and often not a canon - compliant idea.
Another idea could be that a new and unknown force in their land has the ability to make the impossible happen, like male pregnancy. Hiccup becomes a target for this force for some reason, and Toothless has to protect him not only from the physical threats but also from the social stigma that might come with such an unusual situation. As they face these challenges, their bond deepens and they discover new aspects of their love for each other.
Well, it's unique because it combines two very different elements. The relationship between Toothless and Hiccup is already special in the original How to Train Your Dragon story. Adding mpreg to it takes it to a whole new level of creativity. It allows writers to explore uncharted territory in terms of their relationship and how it could develop in such an extraordinary situation.
There are some out there. You can try searching on fanfiction platforms like Archive of Our Own. However, keep in mind that mpreg (male pregnancy) is a very specific and often fictional concept within fanfiction, and the quality can vary greatly.
A 'human toothless x hiccup fanfiction' might tell a story of an alternate universe where Hiccup and Toothless are in a world full of magic. Human Toothless has a special power that only Hiccup can help him control. Their friendship turns into a strong partnership as they face the challenges of this magical realm together.
One common theme is friendship. Despite their differences, whether it's Toothless being a human or just their different personalities, they form a strong bond of friendship. For example, in many fanfics, they start off not understanding each other but gradually become the closest of friends.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fan - made stories, and you can use the search function to specifically look for 'human toothless x hiccup' fanfiction.
You can try looking on fanfiction websites like Archive of Our Own or FanFiction.net. Just search for 'fem Hiccup x human Toothless' in their search bars.
It's also a form of creativity for the fans. They can create stories that combine different elements from the How to Train Your Dragon universe. Maybe add some elements from other fantasy stories they like. This cross - pollination of ideas makes the fanfiction community vibrant and interesting.