One possible reason could be a misunderstanding during a mission. Maybe Erza's actions were misinterpreted by Natsu, leading to him getting hurt, either physically or emotionally.
In Natsu x Erza fanfic, their relationship can be full of adventure - based camaraderie. Natsu is often depicted as the impulsive and powerful mage, while Erza is the strong - willed and disciplined one. They might team up frequently, with Natsu's spontaneity contrasting Erza's calculated moves. This can lead to interesting character dynamics, where they both learn from each other and grow together in their fictional adventures.
In many fanfictions, Natsu and Erza often have a complex relationship. Natsu is usually depicted as a bold and passionate character, while Erza is strong - willed. Their relationship might start from comradeship within the guild. Some fanfictions may explore how they gradually develop deeper feelings for each other, like through shared adventures and facing challenges together. This can lead to a mutual understanding and respect that could potentially turn into a romantic relationship.
It could also show the complexity of their relationship. Maybe Erza's actions are out of her own insecurities or fears, and Natsu getting hurt is a consequence of her not being able to handle those emotions properly. This would mean that their relationship is not just about friendship or comradeship, but also about understanding each other's inner turmoil.
There's also a possibility that it causes a rift in the guild. Other members might take sides. Some might side with Erza, believing she had a good reason, while others might side with Natsu, feeling that Erza was too harsh. This could create a lot of tension within the Fairy Tail guild and further complicate the relationship between Erza and Natsu.
Happy, Natsu's flying cat companion, is a must - include. Happy could be really excited about the new baby and constantly bring little things he thinks the baby would like, like small fish or soft feathers. Wendy would also be a great character to involve. As a healer, she could be checking on Erza and the baby's health regularly, and she might also share her own knowledge of magic that could be related to the pregnancy in some way.
A fanfiction like this would have several implications. Firstly, it would change the nature of Natsu and Erza's relationship from a more platonic or comradely one in the original to a much more complex and intimate one. This would likely have a ripple effect on their interactions with other characters in the guild, like how Gray or Lucy might view them. Secondly, it could bring in themes of responsibility and family, which are not as prevalent in the main Fairy Tail narrative. The guild might have to adapt to this new situation, and it could lead to new adventures or challenges centered around this new family unit.
Natsu might be initially shocked and confused. He's not the type to expect rejection, so he could be at a loss for words at first. For instance, he might just stand there with his mouth open, not believing what he just heard.
In the fanfic, Natsu and Erza's love story might start with their shared adventures. They are both strong mages in the guild. Natsu's fiery personality could be attracted to Erza's strong and determined self. One day, during a difficult mission, Natsu might risk his life to save Erza. This act could make Erza see Natsu in a new light, and from there, a spark of love begins to grow between them.
One popular theme is adventure. Writers often send Natsu and Erza on epic quests together. They might face powerful enemies and overcome great obstacles using their combined powers. Another theme is the development of their relationship. It could start as a simple friendship and gradually evolve into something deeper, like a romantic relationship or a more profound platonic bond.