A plot could involve Elsa's ice powers acting up during her pregnancy. Hiccup, being from a more technological and dragon - friendly world, tries to find ways to help her control it. They might seek the help of Toothless and other magical creatures in their world. Maybe they face opposition from some of their people who are not happy about their union, especially with a baby on the way. But they stand strong together and prove that love can bridge any gap.
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.
Perhaps Hiccup is on a journey to explore new lands and stumbles upon Elsa's frozen kingdom. He helps Elsa overcome some of her fears about her powers that have resurfaced. In the process, they develop feelings for each other. Once Elsa becomes pregnant, they must deal with the cultural shock of their two very different worlds. Hiccup has to introduce Elsa to the Viking way of life, while Elsa tries to make Hiccup understand the elegance and traditions of her kingdom. They also have to figure out how their baby will inherit and control both dragon - related and ice - based powers.
One possible antagonist could be a jealous sorcerer. He might be envious of Hiccup and Elsa's relationship and the power that their unborn child is said to possess. So he tries to harm Elsa during her pregnancy to stop the child from being born. Another could be some of the traditionalists from their respective kingdoms. They don't approve of their relationship and see the pregnancy as a threat to their old ways. They might try to separate Hiccup and Elsa, which would put Elsa's pregnancy at risk.
One idea could be that Hiccup and Elsa accidentally meet in a magical realm between their two worlds. They discover that their powers of ice (Elsa) and dragon - taming (Hiccup) are somehow related to an ancient prophecy that involves saving both of their kingdoms from a common threat, like a powerful fire - breathing monster that is immune to normal attacks but can be weakened by the combination of ice and the special bond Hiccup has with his dragon.
One possible plot could be that Hiccup, while on a journey with Toothless, somehow gets transported to Elsa's world. He stumbles upon Elsa as she is trying to control her powers in a difficult situation. Hiccup, with his experience dealing with dragons, offers her a different perspective on handling her powers. They gradually grow closer as they share their stories and in a moment of deep connection, they share a kiss.
One plot idea could be exploring how Elsa deals with the physical and emotional changes during pregnancy while still having to manage her ice powers. Maybe she has to learn to control her powers more carefully so as not to accidentally harm herself or the baby. Another could be about how the people of Arendelle react to the news. Some might be overjoyed, while others could be worried about the implications of a child with ice powers.
One possible plot could be that in a magical realm where the bond between Toothless and Hiccup is even more profound, an ancient spell or some kind of strange phenomenon causes Hiccup to be able to conceive. Toothless, being extremely protective, would then go to great lengths to keep Hiccup safe during the pregnancy. He might search for special herbs or a safe place for her to give birth. And along the way, they face challenges from those who don't understand this strange occurrence.
One plot idea could be Elsa's journey in dealing with her newfound state while still having to rule Arendelle. She might struggle with how to balance her duties and her pregnancy. Another could be the reactions of the people in Arendelle, some might be overjoyed and see it as a new beginning, while others could be worried about the implications for the kingdom. Also, we could explore how Elsa's powers interact with her pregnancy, like whether her emotions during this time affect her magic in unexpected ways.
One plot idea could be the challenges they face during the pregnancy. For example, how they deal with the changes in their relationship and the new responsibilities. Another could be the reactions of their friends and family to the news.
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.