Perhaps in the fanfic, there's a magical accident that causes Erza to become pregnant. They initially panic because they are not fully prepared for this big change in their lives. But then they start to look forward to it. They could go on a journey to find a safe place to raise their child, away from all the chaos and danger they usually face.
One idea could be exploring how their guild mates react to the news. Some might be overjoyed and offer all kinds of support, while others could be a bit shocked at first. Another could be focusing on how Natsu and Erza themselves adjust to the idea of becoming parents. Natsu might be a bit clumsy at first but full of enthusiasm, and Erza could be more practical and start planning everything right away.
One possible plot could be that they discover the pregnancy and then face challenges together. Maybe they have to deal with the reactions of their friends in the guild, some being happy and supportive while others might be worried about how it will affect their adventuring lives.
One plot idea could be that a magic spell goes wrong and Lucy ends up pregnant. Natsu is initially shocked but then quickly embraces the idea of being a father. They then have to deal with the guild's reactions, some of which are positive and some negative.
One plot idea could be them preparing for the baby's arrival. They might be seen shopping for baby clothes and nursery items. Another could be how they deal with the reactions of their friends in the guild. For example, some might be overly excited while others are more reserved.
One popular plot idea could be Natsu and Erza going on a special mission together that no one else in Fairy Tail can handle. They face a powerful dark wizard and have to combine their unique skills, like Natsu's fire magic and Erza's requip magic, to defeat the enemy.
One plot could be that Natsu becomes overly protective of Erza. He starts to take on extra jobs to save up for the baby. Meanwhile, the guild members also rally around them. Gray might tease Natsu about being a soon - to - be - dad, and Lucy could offer to help Erza with baby - related preparations like knitting baby clothes.
Some of their friends might be worried at first. They know the dangerous lives that Natsu and Erza lead. But then, they would all come around and be very supportive. They could throw a big celebration for the pregnancy, and everyone would chip in to help make a comfortable space for the baby in the guild. There would be a sense of new hope and family spirit in the group.
One idea could be that they discover the pregnancy during a mission. Maybe they are in the middle of fighting some powerful enemy when Erza suddenly feels unwell and realizes she might be pregnant. It could add a whole new layer of drama to the story, with Gray being overly protective.
Perhaps they could go on a journey to find a safe place for their child to be born. Along the way, they discover new things about each other and their relationship deepens. They might encounter different magical creatures or places that test their resolve and love for each other.
One plot idea could be that they discover they're pregnant unexpectedly. Maybe they're still in high school and have to deal with the reactions of their friends and family. Their friends could be initially shocked but then become very supportive. Another idea is that an akuma attack somehow affects the pregnancy, adding a layer of danger and drama.