Perhaps a scientific experiment gone wrong could lead to time travel. The Vikings in the HTTYD world are known for their inventiveness. Maybe Fishlegs, being the more scientifically - minded Viking, creates a device that he thinks will enhance dragon communication but instead opens a rift in time. This would send the main characters, along with their dragons, back to a time when dragons and Vikings had a more hostile relationship, forcing them to use their modern knowledge to change the course of history for the better.
Some characters might be amused. For example, Hiccup could find it interesting to see different interpretations of his adventures in HTTYD 2. He might laugh at the creative liberties taken in the fanfiction.
You can start by checking popular fanfiction websites. Just search for 'How to Train Your Dragon fanfiction after HTTYD 2' and you'll likely get some results.
Fanfiction.net is also a good option. There are many authors who post their HTTYD and HTTYD 2 fanfictions there. However, the quality may vary, so you might need to spend some time looking through different stories to find ones you like.
Start by having a clear idea of your time travel plot. Decide where and when your characters will go and what changes they'll bring.
To write such a fanfiction, you should establish a logical cause and effect for the time travel. For example, a magical artifact or a scientific experiment gone wrong. Next, imagine how the characters would adapt and what challenges they would face in the new time. Don't forget to include references and callbacks to the original How to Train Your Dragon to satisfy the fans.
One interesting fanfiction could be about Toothless having a unique adventure during the time between the first and second movies that the other characters are unaware of until later in HTTYD 2. Another might focus on Hiccup's internal struggles as he anticipates the new challenges in HTTYD 2, all while still dealing with the aftermath of the first movie's events.
In many HTTYD fanfictions where Astrid is pregnant, it often explores how she and Hiccup handle this new chapter in their lives. It could involve Hiccup being overly protective, or Astrid trying to still be as independent as she used to be while dealing with the physical changes. For example, she might continue to train dragons in a more limited way, much to Hiccup's worry.
Well, you first need to have a clear idea of the time period you want to send the characters to. Then, think about how that time travel would affect the story and the characters' development.
Hiccup would likely approach it with enthusiasm. Since he loves his dragons and his adventures, he would be eager to see how others imagine the world of 'How to Train Your Dragon'. He might find some fanfictions that give him new perspectives on his own life and relationships. Toothless, being a dragon, might not understand all the words but would react to the emotions in the stories. If the fanfiction shows a happy moment between him and Hiccup, he might get excited and start making his little happy dragon noises. Astrid would probably analyze the fanfiction carefully. She would look for any inaccuracies in how her character is portrayed, especially when it comes to her skills as a dragon rider and her relationship with Hiccup.
Astrid and Hiccup's kiss in fanfiction can vary greatly. Some might depict it as a soft, hesitant first kiss, while others could show it as a passionate and long - awaited moment. It could also be a turning point in the story, leading to new adventures together as a couple, or facing new challenges in their relationship within the Viking - dragon world of HTTYD.