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.
Well, in many fanfictions, Natsu might initially be in shock. He's a passionate character, so he could react with anger. He might lash out at Lisanna or the person she cheated with. He could also go into a state of self - doubt, wondering what he did wrong.
One possible reason could be that Erza is focused on her own goals and career in the Fairy Tail guild. She might see a relationship as a distraction at that moment. For example, she is always striving to be stronger and take on more challenging missions. Another reason could be that she may not view Natsu in a romantic way but more as a close friend and guildmate. Maybe she has a different ideal type in mind, someone more calm and studious rather than Natsu's brash and impulsive nature.
He may try to understand Erza's reasons. Natsu, despite his impulsive nature, has a big heart. He might respect Erza's decision and step back, trying to keep their friendship intact. However, he could also be a bit persistent in a non - annoying way. He might keep showing his care for her in a more friendly manner, hoping that over time, she might change her mind.
Natsu could handle the rejection by using it as motivation. He might train harder to prove himself to those who rejected him. For example, if he was rejected from a magic competition, he could practice new spells and techniques to show up the judges next time.
After Natsu gets angry, the plot might develop with other guild members trying to mediate. Happy might try to calm Natsu down while Gray could be in the middle trying to make both sides see reason. This could create a lot of comical and tense moments in the fanfiction.
Natsu would likely be extremely hurt. He has always been loyal to Fairy Tail, so being betrayed would be a huge blow. He might initially be in disbelief, not wanting to accept that his friends and guildmates could turn on him.
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.
Natsu might be initially shocked and sad. He could go off on his own for a while to think about what happened. Since he's a passionate person, the rejection would hit him hard.
There could be such a fanfiction. Fanfiction writers often come up with all kinds of creative and sometimes out - of - the - box ideas. However, I haven't personally come across one where Natsu gets Erza pregnant. It might be a rather niche concept within the Fairy Tail fanfiction community, as most fanfictions tend to focus on different aspects of the characters' relationships, like friendship, adventure - related partnerships, or other forms of romantic development.
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.