One possible plot could be that Natsu and Erza leave Fairy Tail due to some kind of internal conflict within the guild. Maybe there are differences in opinions regarding how the guild should be run or what kind of jobs they should take. So they decide to set out on their own journey to find a new purpose.
Well, in this fanfiction, perhaps Natsu and Erza leave Fairy Tail because they are on a mission to discover some hidden secrets about their pasts. They feel that the guild, while a great place, is holding them back from fully exploring their origins. So they leave to find answers, facing many challenges along the way, like powerful enemies who don't want them to uncover the truth.
It could be a group of rogue mages who have a vendetta against Natsu and Erza. They see the two leaving Fairy Tail as an opportunity to attack them when they are more vulnerable outside the protection of the guild.
It could be that Natsu has some sort of falling - out with the members of Fairy Tail. Perhaps there was a misunderstanding during a big mission, and he decides he can't stay any longer. For example, if his actions were misinterpreted and the guild members blamed him for something that wasn't his fault. He might leave to prove his innocence elsewhere.
One great aspect of Natsu and Erza fanfiction is the exploration of their unique friendship. In many stories, their different personalities - Natsu's brashness and Erza's strictness - create interesting dynamics. For example, there are fictions where they team up for a mission and Natsu's unorthodox methods initially clash with Erza's by - the - book approach, but eventually they learn to work together better, leading to a stronger bond between them.
One possible reason could be a misunderstanding within the guild. Maybe some false information was spread about them, leading others in Fairy Tail to turn against them. Another reason might be a power struggle. If Natsu and Erza were becoming too powerful, some jealous members could have conspired to make it seem like they were betraying the guild. Or perhaps an outside force manipulated the situation to drive a wedge between them and the rest of Fairy Tail.
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.
Well, in fanfiction where Natsu leaves the guild, he could become a sort of lone wolf. He might travel to far - off lands to discover more about his dragon - slayer powers or his past. This could lead to him meeting new and powerful allies or enemies. Without the support of the guild, he would have to rely solely on his own strength and wits. It could also make him a more serious and hardened character, as he no longer has the safety net of his Fairy Tail family.
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.
It could be about Natsu having left Fairy Tail for some reason and then reuniting with the guild in a very unexpected way. Maybe he has new powers or a different outlook on life that causes some friction and also some amazing moments of reunion and growth within the guild.
Well, the story could be full of heartwarming moments. The baby might inherit Natsu's fiery spirit and Erza's strong will. They could raise the baby in the Fairy Tail guild, surrounded by friends like Lucy and Gray. Maybe the baby would have some unique magic abilities, a blend of Natsu's dragon slayer magic and Erza's requip magic. And the guild members would all chip in to take care of the little one, with comical and touching scenes of babysitting.
Gray would be shocked at first. He and Natsu have a long - standing rivalry - but also a deep friendship. He might initially be angry that Natsu would just leave like that, but then he would realize how much he'll miss him. He might also feel a sense of loss for the guild as a whole, since Natsu is such an important part of it.