Perhaps in the fanfiction, Lucy is pregnant in a magical or fictional world. She could be the only one pregnant in that world, and it gives her special powers or a special role to play. For example, her unborn baby might be prophesied to save the world from a great evil. So she has to protect herself and the baby while also preparing for this great destiny.
One idea could be that Lucy's pregnancy is unexpected and she has to deal with the reactions of her friends and family. Some might be overjoyed while others are worried. Another could be a story where the father of the baby is a mystery and Lucy goes on a journey to find out who it is. Maybe she discovers some secrets about her past relationships along the way.
A possible plot for 'lucy pregnant fanfiction' is that Lucy is part of a group or a team. Her pregnancy changes the dynamics of the group. Some members become more protective of her, while others think she will be a liability. This causes tension within the group, and Lucy has to prove that she can still contribute and be an important part of the team while being pregnant.
One idea could be that Natsu and Lucy face challenges in their guild duties while being pregnant. They might have to balance protecting the guild and their unborn child. For example, they could go on a mission that seems easy at first but turns out to be more dangerous due to Lucy's condition, and Natsu has to be extra cautious to protect her.
One idea could be that they face challenges in preparing for the baby, like finding a suitable home. Maybe they have to deal with family reactions, both positive and negative. Another could be that during the pregnancy, they discover new things about each other's pasts.
One idea could be that Loke has to quickly adapt to the idea of becoming a father. He might start learning about parenting by reading old books in the Celestial Spirit World. Another could be that Lucy's pregnancy reveals some hidden magical powers related to motherhood in her family's lineage.
Another plot could be that Lucy gets pregnant through some sort of magical accident. She then has to figure out how to deal with the changes in her body and magic while also trying to find a way to reverse the 'accident' if she wants to. But during this process, she starts to form a special connection with the unborn child and has a change of heart.
Well, a plot could revolve around Sting being overly protective of Lucy during her pregnancy. He might try to keep her from going on any dangerous missions, which could lead to some cute arguments between them. Then there's the idea of them preparing a nursery together. They could have different ideas about how it should look, like Sting wanting it to be all about Sabertooth's colors and Lucy having a more whimsical design in mind. And of course, there could be a plot where they discover that their baby has some special magic abilities even before it's born.
Well, a plot could involve Natsu and Lucy trying to keep the pregnancy a secret at first. They don't want to cause a stir in the guild right away. As the pregnancy progresses, they start to realize they need to prepare. Natsu tries to earn extra money by taking on dangerous jobs, which Lucy doesn't like. Meanwhile, the baby could have some sort of special magic that starts to show even before it's born, attracting the wrong kind of attention from dark mages.
Well, a possible plot is that there are some dark forces that target Lucy because of her unborn child. Maybe they believe the baby will have some special powers. Laxus then has to go on a journey to find a way to protect them. And as for their relationship, it could be strained at first because of the stress, but they gradually grow closer as they face the challenges together. Plus, there could be a sub - plot about how Lucy's celestial spirits react to the news. Some might be overjoyed and offer their own unique forms of protection.
One idea could be exploring how the other members of Fairy Tail support Lucy during her pregnancy. For example, Natsu might be overprotective, always making sure she's safe on missions or just in general. Another could be Lucy writing in her diary about her hopes and fears for the future as a mother, while also reflecting on her adventures in Fairy Tail.
A plot idea could be that Desmond and Lucy are on a mission to find a hidden Piece of Eden. Along the way, they face many challenges and have to rely on each other's strengths. Maybe Lucy is the one who is more knowledgeable about the historical context and Desmond uses his Eagle Vision to navigate through dangerous areas. They could also face internal conflicts within their own organizations that threaten their mission and their relationship.
Perhaps in the fanfiction, Lucy gets lost in a magical maze that appears in Narnia. Aslan has to enter the maze to find her. While in the maze, they encounter strange magical beings and challenges. Through this experience, their bond deepens, and they emerge with a new understanding of their roles in Narnia.