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.
She might gain new perspectives on the characters and story. Since she's a part of the How to Train Your Dragon universe, seeing different interpretations in fanfiction could be interesting.
It could mean that Valka, a character perhaps from 'How to Train Your Dragon' (HTTYD), is interested in the fan - created stories about the HTTYD world. Maybe she enjoys seeing different interpretations of the story and characters.
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 likely some popular ones. For instance, some fanfictions that explore the relationship between Hiccup and Astrid during the time leading up to HTTYD 2 are quite popular. They might show how their relationship evolves and how they support each other in anticipation of the new threats in the second movie.
Well, in the real world, it's not possible. But if we were to think in a more creative, fictional sense, like in a meta - story where the httyd world intersects with our own digital or written realm in some magical way, then maybe. But generally, no, as it's just a fictional entity without the physical or mental faculties to do such a thing.
This is such a unique idea. Firstly, we need to consider that 'httyd' in this context is fictional, but if we imagine it could watch fanfiction. It might react in different ways depending on the type of fanfiction. For instance, if it's a well - written action - packed fanfiction that stays true to the spirit of the original, it might enjoy seeing its world expanded. However, if it's a fanfiction that goes against the core values of the httyd world, it might be a bit shocked or dismayed.
The fanfiction might focus on how the relationships between the characters change when the two worlds of HTTYD and HTTYD2 collide. For example, Astrid might have to adapt to new ways of dragon riding she sees in HTTYD2, and this could cause some friction or growth in her relationship with Hiccup. It could also involve the dragons from the first movie learning new skills from the HTTYD2 dragons.
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.