I'm not sure specifically if there is a 'hiccup haddock pregnant' fanfic. There are so many fanfics out there in the vast world of fandom, and it might be difficult to determine the existence of one with such a specific theme without doing a thorough search on fanfic platforms.
Their relationship would become more centered around the future. They'd have more serious conversations about how to raise the child. Valka might be more open about her past experiences with dragons to Stoick, so they can decide how to share that part of her life with the baby. And Stoick would be more cautious in his actions, not wanting to put Valka or the unborn baby in danger.
Yes, there are quite a few. You can find them on some fanfic websites. Some might focus on their adventures together in a new, unique setting that the original stories didn't explore. For example, they could be on a mission in a far - off, magical land where they have to rely on each other even more than usual.
Sure, there are many. You could try searching on platforms like Archive of Our Own. Fanfic writers often create stories that show different aspects of the Haddock - Tintin relationship. Some stories might be set in alternate universes where their relationship has a different flavor, perhaps with more emotional depth or different challenges that they face together.
It's hard to say if it's common. Since Valka is a fictional character, we don't really have data on her fictional reading habits. But in the context of the fandom, it could be seen as something that would be cool if she did, as it would show her interest in the fan - created content.
One popular tintin x haddock fanfic is 'The Adventures Beyond the Pages'. It delves into their relationship in a new and exciting way, with great character development and an engaging plot.
There probably are. 'How to Train Your Dragon' has a huge and passionate fan base. Fanfiction writers often take the characters, such as Hiccup (from what I think you meant) and other related characters, and create their own stories. So it's very possible that there are works of fanfiction that someone could watch, perhaps in the form of written stories being read aloud or turned into some kind of visual adaptation by fans.
Since I'm not familiar with the specific 'valka erotic story', it's hard to say if there is a non - adult interpretation. But often, if a story has an adult theme, it can be reimagined in a more family - friendly way by focusing on other aspects such as the characters' relationships in a non - sexual way.
One common theme could be the anticipation and excitement surrounding the new life. It might explore how Valka and those around her prepare for the baby.