Perhaps the pregnancy is a result of a magical accident. They could be on a mission where they are exposed to some strange magic that causes this. Then they have to deal with not only the physical and emotional changes of pregnancy, but also try to find a way to reverse it if they're not ready. But as time passes, they start to grow attached to the idea of having a baby and decide to keep it.
Another plot could involve how their friends in the guild react. Some might be overjoyed and offer lots of support, while others might be initially shocked. For example, Natsu could be really excited about having a little one around, but Erza might be more concerned about how this will affect their guild activities. And then there could be a sub - plot about them preparing a nursery in their home, which is filled with magic - themed items.
One idea could be that they discover the pregnancy unexpectedly. Maybe they were in the middle of a big adventure in their magical world and then Lucy starts showing signs. It throws them into a new set of challenges as they have to balance their duties in their guild with preparing for a new life.
One possible plot development could be that Laxus initially struggles with the news. He might be worried about his ability to be a good father. However, as time passes, he realizes his love for Lucy and their unborn child and starts to prepare for the new addition to their lives. For example, he could start training harder to be a protector of his family.
Well, perhaps Laxus has some misguided notion that Lucy has information vital to the guild's safety. So he kidnaps her thinking he can extract it from her quickly. But in reality, Lucy has no such information and she has to convince Laxus of that.
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 possible plot could be that Lucy and Laxus accidentally end up having to take care of a baby together. Maybe they find a lost baby during one of their guild missions. At first, they're both really clumsy and unsure of how to handle it. But as time goes on, they start to develop a bond not only with the baby but also with each other in a new, more family - like way.
Maybe the story could revolve around how their guild mates react to the news. Some might be overly excited and start planning big parties, while others could be more cautious and offer practical help, like setting up nurseries for them. It would show the strong community within the guild.
One plot idea could be that Lucy and Laxus accidentally travel back to a time when Fairy Tail was first founded. They could meet the younger versions of the guild members and get involved in the early struggles of the guild. For example, they might help in a battle against a rival guild that was trying to stop Fairy Tail from being established.
One common theme is the element of surprise. Usually, they find out about the pregnancy unexpectedly, which then sets off a chain of events in the story.
One possible plot could be that they accidentally end up having to take care of a baby during a mission. Maybe they find an orphaned baby in a dangerous situation and decide to protect it. This could lead to some really cute and funny moments as they struggle to take care of the baby's needs while also dealing with the threats around them.
There could also be other supporting characters from the Fairy Tail guild. For instance, Mirajane might play a role in giving advice to Lucy about pregnancy and motherhood, since she has a nurturing side. And Makarov, as the guild master, could be involved in ensuring the safety of Lucy and the future of the guild with a new member on the way.
This situation could also bring out a softer side of Laxus that others in the guild haven't seen before. He'll be more affectionate towards Lucy, and they'll share a special bond over their unborn child. Their relationship will transform from just a couple to soon - to - be - parents, which is a huge shift that will be filled with both challenges and beautiful moments.