A plot could involve Lucy getting into trouble with a powerful dark magic user. Yukino, being the loyal friend she is, comes to her rescue. They have to fight against the dark magic user and his minions. In the process, they learn more about each other's pasts and the reasons why they are so determined to protect the magical world. This experience deepens their bond and makes them an even stronger team in the magical community.
Maybe a plot where Lucy and Yukino accidentally switch magical powers. This leads to a series of comical and also dangerous situations. They have to figure out how to reverse it while also dealing with enemies who want to take advantage of their confusion.
One idea could be that they discover the pregnancy during a mission. They then have to balance their duties as mages with preparing for the new life. Maybe they face some challenges from their guild mates who are initially worried about how it will affect their performance in the guild.
Maybe a plot where Yukino gets kidnapped by an enemy, and Rogue has to go through a series of trials to rescue her. During this, he discovers new aspects of his own power and his feelings for Yukino. It could involve a lot of action scenes as Rogue battles the kidnappers and their minions. Also, there could be some emotional moments when he finally reaches Yukino and they share a tender moment.
One idea could be that Naruto and Yukino team up to train a new generation of ninjas. They combine their different skills and teaching methods to bring out the best in the young ones.
There's also 'Lucy and Yukino: A Celestial Alliance'. This story might focus on their connection through celestial magic. It could have them sharing secrets about their celestial spirits and how that knowledge helps them in a difficult situation, like fighting a powerful dark wizard.
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.
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.
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.
One idea could be that Lucy and Hibiki are from different worlds but are brought together by a magical accident. They then have to team up to find a way back to their respective homes while facing various challenges along the way.
One idea could be that Lucy discovers a new magical power within herself. Maybe she finds an ancient spellbook that unlocks a hidden potential related to her celestial spirit magic. For example, she could learn to combine the powers of multiple spirits in a new and unique way, making her attacks much more powerful.