Well, a fanfic about Astrid and Toothless involving pheromones could be really interesting. It might explore a unique bond between them. Maybe it delves into how the pheromones could affect their relationship in a fictional world. It could be that the pheromones create an unspoken understanding or some sort of special connection that goes beyond the normal interactions we see in the original story.
One popular 'hiccup x astrid modern fanfiction' is 'Modern Vikings' which reimagines their story in a modern setting with Hiccup as a tech - savvy guy and Astrid as a strong - willed athlete. They meet at school and their relationship develops through various modern - day challenges and adventures.
Another theme might be adventure. Since they are likely from a story with some sort of action or adventure setting, their relationship could be explored within the context of facing challenges together. For example, they might have to work together to save their world or community, and during that process, their bond grows. Also, themes of self - discovery could be present. As they interact with each other, they learn more about themselves and their own capabilities.
One common theme is adventure. Astrid is often portrayed as a strong and brave character, so the fanfictions may involve the reader joining her on some exciting quests or battles. Another theme is romance, of course. Writers like to explore the relationship between Astrid and the reader, from the initial attraction to a deep and loving connection.
It's not okay. Fanfic is a form of creative writing that should enhance the enjoyment of the original work. Sexual fanfic of this nature is not in line with the spirit of most fan communities, which are about celebrating the story, characters, and themes in a positive and inclusive way. It can also lead to negative impacts on the perception of the fandom as a whole.
Well, 'Astrid and Toothless: Partners in Flight' is also a good one. It starts with Astrid being a bit hesitant around Toothless. But as they train together for a big event in Berk, they start to understand each other better. Their relationship evolves from mere acquaintance to a strong bond that helps them both grow as characters.
Another theme is the preservation of their traditional values. Even though they are in a modern world, they still hold onto things like loyalty, courage, and a sense of community. In some fanfictions, they might be involved in community projects where they use their traditional values to make a positive impact in the modern Berk or wherever the story is set.
Another option is to check out some Tumblr blogs dedicated to How to Train Your Dragon fanfiction. There are communities of fans who share and discuss different fanfic pairings, and they might be able to point you in the direction of some female Hiccup x male Astrid fanfictions.
One possible plot could be that Astrid discovers some strange pheromones that seem to be coming from Toothless. This leads her to start investigating and as she gets closer to Toothless, she starts to feel different emotions. Maybe she begins to understand Toothless in a new way because of these pheromones.