One possible plotline could be a role - reversal adventure. Since Hiccup is female in this scenario, she might face different challenges in dragon - training compared to the male Hiccup in the original. And Astrid, as a male, could have a different dynamic in their relationship, like being more protective or having different communication styles.
There could be a story about them competing in a new dragon - riding competition. Fem Hiccup might use her unique skills and intelligence, while Male Astrid could rely on his strength and courage. Their relationship could develop during the competition, with moments of rivalry turning into mutual respect and eventually love.
A more angsty plotline could be that Fem Hiccup is an outcast in the village not just because of her different approach to dragons but also because she is a female in a male - dominated area. Male Astrid could initially be part of the group that shuns her but later realizes her worth. This would lead to a story of redemption, acceptance, and love between them.
Maybe Astrid is hurt while on a mission to explore a new area. Hiccup, being the caring friend he is, sets aside his own tasks to stay by her side. He could search for a rare herb to heal her wounds. As he does this, their relationship deepens as Astrid realizes how much Hiccup truly cares for her.
You can try looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a wide variety of fanfictions, and by using the search function with the relevant tags like 'Fem Hiccup' and 'Male Astrid', you might be able to find some interesting stories.
One great fem Hiccup and Astrid fanfiction is 'A New Path'. It explores their relationship in a unique way, with fem Hiccup being a strong and independent character. She challenges the traditional roles in their Viking society, and her dynamic with Astrid is full of interesting twists and turns.
You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of fan - created works there. Just use the search function and type in 'Fem Hiccup x Male Astrid' to see if there are relevant stories.
The plot is crucial. It could be a reimagining of the original How to Train Your Dragon story with the gender - swapped characters, or it could be a completely new adventure. Maybe they go on a quest together, and during that journey, their relationship develops in an interesting way. It should have a clear beginning, middle, and end, and keep the reader engaged throughout.
One possible plotline could be that Fem Hiccup and Male Merida meet in a forest while on their respective adventures. They initially clash due to their different ways of doing things. Hiccup is more methodical and Merida is more impulsive. But as they face a common enemy, like a giant magical beast, they learn to work together. Hiccup uses her engineering skills to create traps and Merida uses his archery skills to lead the beast into the traps. In the end, they become good friends and respect each other's cultures and abilities.
Another place to check is FanFiction.net. There are many writers who post their fem Hiccup and Astrid fanfictions there. However, the search might be a bit more tricky as you need to be more specific with your keywords. But once you find some good stories, it's worth it.
One interesting plotline could be that as they turn into dragons, they have to quickly learn how to fly and hunt like real dragons. They might face challenges from other dragons who see them as outsiders in their new dragon forms.
If there is such a fanfiction, a possible plotline could be that Astrid cheats on her partner due to feeling neglected or misunderstood in the relationship. The 'lemon' aspect, if not related to adult content, could be some sort of sour or difficult situation that arises from the cheating, like a rift in friendships or family ties.
Another plot could be that Hiccup and Astrid are both on the school's sports team. They are always competing with each other for the top spot. However, during an important competition, one of them gets injured. The other one shows great care and concern, which makes them see each other in a new light and leads to the development of their romantic relationship.