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.
They would likely become even more of a united front. Their decision - making would be more intertwined, and they'd support each other even more strongly in battles and in ruling the village.
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.
Their relationship would likely change in many ways. For one, they would be more open and trusting. Since they've been through so much together in Sword Art Online, getting married would be like a new chapter. They would support each other even more in their daily lives. Kirito might become more protective, and Asuna would be more nurturing. They would also have to deal with the normal relationship stuff like sharing household chores and making decisions together, but with the added bonus of their deep love and understanding from their virtual adventures.
After marriage, they would become even more protective of each other. Bambi would be more confident in providing for Faline and their future family. Faline would be a strong support for Bambi, and they would share a deeper understanding.
After marriage, their relationship would likely become even deeper. They would have a stronger sense of commitment to each other. Vegeta might become more protective of Bulma, not just in battles but also in daily life. He would start to understand Earth customs better through her. Bulma, in turn, would help Vegeta further integrate into Earth society. They would also be more united in raising Trunks and any future children.
Their relationship might become more equal in some ways. As dragons, they are both facing a new and strange existence, so they have to rely on each other more. They might develop a new understanding of each other's strengths and weaknesses.
During the pregnancy, their relationship would shift to be more centered around the upcoming baby. Hiccup would be constantly thinking about how to keep Astrid and the baby safe, especially with his role as a leader. Astrid would be dealing with the physical and emotional changes of pregnancy, and Hiccup would be her main support. This would bring out new aspects of their love for each other, like a deeper level of understanding and patience.
A fanfiction might depict their marriage as a union that not only unites them but also brings new hope to Berk. As they get married, they could announce new plans for the village. Maybe they plan to build a new school for the children, teaching them both the ways of the Vikings and the importance of peace with the dragons. Their marriage could be seen as a symbol of a new era in Berk's history, where humans and dragons live in even greater harmony, and Hiccup and Astrid lead by example with their love and partnership.
There are many fanfictions out there about Hiccup and Astrid's wedding. Some might focus on the elaborate preparations, like Astrid choosing her wedding dress which could be a traditional Viking style with a modern twist. The fanfic could also show Hiccup being nervous but excited at the same time.
Their relationship would likely become more tender. Hiccup would be more protective of Astrid, always making sure she is safe and comfortable. Astrid, on the other hand, might be more reliant on Hiccup during her pregnancy.