Perhaps a plot where Lucy discovers she has some unique magical abilities related to her pregnancy. Maybe the baby has some sort of special magic that starts to affect Lucy's own powers in unexpected ways. This could lead to her having to train differently and seek help from the more experienced magic users in the guild.
A possible plot is that Lucy's pregnancy is a result of some mysterious magic that she was exposed to during a mission. The guild then has to figure out what exactly happened and how to ensure the health of both Lucy and the baby. They might encounter some dark forces that are interested in the unborn child's power.
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.
One idea could be that they face challenges in protecting their unborn child from dark forces in the Fairy Tail world. Maybe some old enemies resurface, seeing the baby as a threat or a powerful asset. Another could be the reactions of their friends in the guild. Some might be overly excited and constantly fussing over them, while others could be more reserved and worried about the future of the guild with Natsu and Lucy having a family.
One plot idea could be how Lucy adjusts to her new state while still being part of the Fairy Tail guild. Maybe she has to take on less dangerous missions at first and her friends rally around to protect her. For example, Natsu could be overly protective, getting into comical situations as he tries to keep her out of harm's way.
One idea could be that Sting and Lucy are on a joint mission. They get lost in an ancient, magical forest. As they struggle to find their way out, they start to share their deepest fears and dreams, which brings them closer. Another could be a story where Lucy is in danger and Sting has to fight off a powerful dark guild to save her, and during this, he realizes his true feelings for her.
A plot could involve Freed accidentally casting a spell that links his and Lucy's minds. At first, it's a chaotic mess as they have to deal with suddenly sharing thoughts and feelings. But as time goes on, they start to understand each other on a deeper level. They use this newfound connection to uncover a plot within the Fairy Tail guild by a group of mages who are trying to undermine the guild's leadership, and in the process, their relationship blossoms.
One plot idea could be that Lucy discovers a cat with magical powers that is related to an ancient Fairy Tail legend. The cat could lead her on a quest to find a hidden treasure that was lost long ago in the world of Fairy Tail.
One idea could be that Lucy discovers she has hidden witch powers passed down through her family. Maybe she can use these powers to save the Fairy Tail guild from a new, powerful dark magic threat. Another plot could involve Lucy being transported to a parallel world where she is a well - known and feared witch, and she has to find her way back while also learning about her new - found powers in that world.
One plot idea could be that Hibiki and Lucy are on a joint mission. They discover an ancient magic artifact that has the power to either save or destroy the world. Along the way, they face various challenges and their friendship grows as they rely on each other's unique magical abilities to overcome obstacles.
One plot idea could be that Lucy and Lisanna team up for a special S - class mission. They face a powerful dark wizard who has the ability to control time. Along the way, they discover new magic spells and also learn more about each other's pasts. This would create a lot of action and character development.
One plot idea could be that Loke has to protect Lucy from a powerful dark magic user who is specifically targeting her celestial magic. Another could be a story where Lucy discovers a new and rare celestial key, and Loke helps her figure out how to use it. Maybe a plot where they get trapped in a magical realm and have to rely on each other to get out.
One idea could be that Aquarius gets trapped in a different dimension, and Lucy has to go on a dangerous quest to rescue her. She might have to team up with some unexpected allies from Fairy Tail. Another plot could involve Aquarius losing her memory, and Lucy has to help her regain it while also protecting her from those who would take advantage of her in this vulnerable state.