A possible storyline is that Astrid and Hiccup face some challenges during the pregnancy. Maybe there are some old enemies who try to take advantage of Astrid's vulnerable state. But they overcome it with the help of their friends and the dragons. Also, they could discover some new dragon abilities related to pregnancy, like a special type of dragon that can help ease Astrid's discomfort during the pregnancy.
There's a fanfic called 'Hiccup and Astrid: The Pregnancy Chronicles'. In this, it focuses on how their relationship evolves during the pregnancy. They face challenges like preparing for the baby in a Viking village that's not fully ready for all the new changes that come with a new baby. It also delves into their emotional states, like Hiccup's concern for Astrid's health during the pregnancy.
One possible fanfiction could be about how Hiccup and Astrid deal with the pregnancy. Hiccup might be overprotective, constantly worried about Astrid and the baby. Meanwhile, Astrid could be trying to keep up with her normal Viking duties while also preparing for motherhood. And the lemon element could be a symbol in the story, perhaps it's something Astrid craves during her pregnancy, leading to some humorous or heartwarming scenes between her and Hiccup as he tries to find the perfect lemon for her.
One possible plot twist could be that they discover the pregnancy is part of a magical prophecy. Maybe the child is destined to bring peace to their land, but there are forces that want to stop the baby from being born. Another twist could be that Astrid has some sort of rare condition during the pregnancy that makes it difficult for her and Hiccup to be sure if the baby will be okay. For example, she might be affected by a strange magic that is slowly draining her energy while the baby grows.
A possible plot is that Astrid is pregnant and she's worried about how she'll continue to be a strong warrior. She might struggle with the idea of being more vulnerable. Hiccup, on the other hand, is over the moon but also realizes he needs to step up and protect their family more. They could also face some opposition from the village elders who are worried about how a pregnant warrior and a new baby will fit into the village's traditions.
One possible plot idea could be that they discover Astrid is pregnant and they start preparing for the baby. Hiccup might be a bit nervous at first but then becomes super excited. They could face challenges like how to keep the village safe while also getting ready for the new arrival.
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.
One possible storyline could be that Zanessa discovers they are pregnant unexpectedly. They then have to deal with the reactions of their friends and family. Some might be overjoyed while others could be concerned about their future. They would need to make decisions about their careers and how to balance impending parenthood with their personal and professional lives.
One possible storyline could be about how the pregnancy affects Celestia's daily duties in her magical realm. She might have to delegate more tasks as she experiences the physical and emotional changes. Another could be the discovery of the pregnancy and how the other characters in the story react, whether it's with joy, concern, or a mix of both.
One popular storyline could be their adventures together in exploring new lands. They might discover a hidden dragon lair and have to work together to understand and befriend the new dragons there. Another could be a story where they are training young dragon riders, passing on their knowledge and experiences. And they could also be involved in a plot to protect Berk from a new, unknown threat, relying on their strong bond and skills.
One idea could be exploring how they adjust to the new responsibilities. Hiccup might be worried about protecting his family while still leading the village. Astrid could be determined to train their future child to be a great dragon rider from an early age.