There would be a shift in their dynamic as they prepare for a family. Hiccup, who is used to being adventurous, would have to focus more on home and stability. Astrid, while still strong - willed, would become more nurturing. They would need to find a new balance in their relationship, between their old selves and their new roles as parents - to - be.
Astrid's character could develop in many ways. She may become more empathetic towards the other mothers in Berk. Before, she was mainly focused on her warrior duties, but now she can relate to the women who have to take care of their families. She might also learn to rely on others more, especially Hiccup, as she goes through the physical and emotional changes of pregnancy.
There is also 'Hiccup and Astrid's Adventure'. This one takes them on a journey to a new land. The way it describes their interactions and how they rely on each other is really engaging. The author has a great writing style that makes you feel like you're right there with Hiccup and Astrid during their adventure.
One idea could be to focus on how Astrid and Hiccup prepare for the baby. They might start building a new addition to their home on Berk. Hiccup could be super protective, while Astrid is determined to still be involved in dragon - related activities as much as she can until she can't anymore.
If Astrid gets injured, it could strengthen her relationship with Hiccup. Hiccup would be very worried about her and would do everything he can to take care of her. This would show Astrid how much he cares, and she would likely appreciate his efforts, bringing them closer together.
It develops gradually. At first, they might be just friends who respect each other's skills. But as they go on more adventures together, they start to notice little things about each other. For example, Hiccup notices how Astrid is always the first to volunteer for dangerous tasks because of her bravery. And Astrid sees how Hiccup's intelligence always gets them out of tough situations.
After getting married, their relationship would become even more solid. They would have a deeper sense of partnership. Hiccup would be more confident in his decisions, knowing he has Astrid by his side, and Astrid would be more open to Hiccup's sometimes out - of - the - box ideas.
It can make their relationship more intimate. Just the physical closeness of being in the same bed can break down some barriers. They might start seeing each other in a different light, more as equals and partners rather than just friends or comrades.
The kiss is special in fanfiction as it can bring out different aspects of their characters. For Astrid, it might show her softer side that she usually hides. For Hiccup, it could be a moment of confidence, knowing that he has won the heart of such a strong - willed girl. And for the readers, it's a moment that they've been waiting for, a payoff for following their story and seeing their relationship develop from a distance in the HTTYD - inspired fanfiction.
The relationship between Hiccup and Astrid during her pregnancy would be a journey of growth. Hiccup would have to be more patient as Astrid's hormones might make her moody at times. Astrid would rely on Hiccup more, which could be a big change for her. They would also start making plans for their family, like where the baby will sleep and how they will raise it. Their love would transform from the passionate love of two young adventurers to a more profound, family - centered love. They might also have some cute moments, like Hiccup talking to the unborn baby at night, which would make Astrid feel even more loved.
Archive of Our Own (AO3) is also a great place. It has a very inclusive and diverse set of fanfictions. Just search for 'httyd hiccup and astrid' and you'll get a bunch of results. The site also has good tagging systems so you can easily find stories with the elements you like, such as adventure or romance.