I'm sorry, but I can't recommend 'lemon' fanfics as they often involve inappropriate and adult - like content. However, you can look for general 'hiccup x elsa' fanfics on fanfiction websites like Archive of Our Own or FanFiction.net.
Well, one interesting idea could be their exploration of each other's magical abilities. Hiccup could be fascinated by Elsa's ice powers and they could learn from one another about controlling and using their unique gifts.
The very idea of a 'hiccup x toothless lemon fanfic' is a misappropriation of the original characters and their relationship. The original story is about friendship and adventure, and adding 'lemon' elements would distort this. It's better to focus on fanfics that stay true to the spirit of the original, such as those that explore new adventures for Hiccup and Toothless or expand on their bond in a positive and appropriate way.
Well, perhaps there could be a fanfiction where Hiccup and Elsa are both summoned by a powerful wizard to help with a prophecy. They don't trust each other at first, but as they face the challenges set by the wizard, which include tasks that require both fire (from Hiccup's dragon) and ice (Elsa's power), they start to respect and care for each other.
Character development is a great element. Seeing how the reader character grows and changes through their interactions with Hiccup is really interesting. Also, the description of the Viking world, like the details of Berk, the dragons, and the traditions. For example, when the author describes how the reader adapts to the Viking way of life, it makes the story more immersive.
Their relationship might start with curiosity. Hiccup would be curious about Elsa's ice powers and Elsa about Hiccup's connection to dragons. As they interact more, they start to respect each other's abilities and personalities. This mutual respect turns into friendship, and then gradually into love. The news of the baby would strengthen their bond as they now have a shared future to look forward to. They would support each other more, with Hiccup protecting Elsa during her pregnancy and Elsa using her powers to help Hiccup in his adventures.
In a story, their powers could combine in a more creative way. Let's say they need to build something. Hiccup could use his knowledge of dragon - based mechanics and Elsa could use her ice to shape and form the structure. The heat from the dragon could also be used to melt and reshape the ice as needed, creating a unique construction.
Well, I'm not really into promoting or having access to 'lemon' fanfics which often involve adult - like or inappropriate content. However, if you're just looking for general 'hiccup x toothless' fanfics that are family - friendly, you can ask in relevant fan communities on social media. They might be able to point you in the right direction.
The best elements would include their respective powers. Hiccup's dragon - training skills and Elsa's ice magic can create some really cool interactions. For example, they could use their powers together to fight off an enemy or to create something beautiful for their kingdoms. Another element is the cultural clash and subsequent understanding. Hiccup's Viking ways and Elsa's royal Arendelle upbringing can lead to interesting situations where they learn from each other.
First, understand the characters well. Hiccup is from 'How to Train Your Dragon' and Elsa from 'Frozen'. For a married fanfiction, start with how they meet. Maybe it could be in a magical land that combines the worlds of Berk and Arendelle. Then, focus on their relationship development. Show how they learn about each other's strengths and weaknesses. For example, Hiccup's ability to bond with dragons could amaze Elsa, and Elsa's ice powers could be useful in Berk's cold climate. Finally, add some conflict, like a villain who wants to break their marriage or a misunderstanding between them to make the story more exciting.