One possible plot could be that Erza discovers she's pregnant and has to deal with the shock while still being part of her guild and its adventures. She might worry about how it will affect her ability to fight and protect her friends.
It could be one of her close friends from the guild. Maybe Jellal, considering their complex relationship in the original story. There's already a lot of history between them, and this could be a new development in their relationship.
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.
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.
In a non - adult take on this fanfiction, it could start with Naruto and Erza being accidentally transported to a parallel dimension. In this dimension, there is a unique energy that affects Erza's body in a way that seems like she is pregnant. They have to figure out how to get back to their own worlds while also dealing with this new situation. Along the journey, they meet various characters from both Naruto and Fairy Tail universes who are also trapped in this dimension, and together they work towards a solution.
One possible plot could be that Naruto and Erza are from different universes that somehow collide. They meet and fall in love against all odds. When they find out Erza is pregnant, they have to face challenges from both of their worlds. Naruto's ninja village might be skeptical about his relationship with someone from another realm, and Erza's guildmates in Fairy Tail could also have concerns. But together, they strive to protect their unborn child and find a way to make their two worlds coexist peacefully.
In a 'naruto gets pregnant fanfiction', perhaps there is a powerful enemy who casts a spell on Naruto. This spell not only endangers his life but also has the side - effect of making him pregnant. The story could then revolve around Naruto trying to find a way to reverse this while also dealing with the reactions of his friends and the village.
It could be that Natsu is part of an experiment in a parallel universe within the fanfiction. The experiment gives him the ability to get pregnant. His journey would involve coming to terms with this new state, facing the challenges of pregnancy, and maybe even finding a way to reverse it if he wishes.
The plot might involve the father of the baby as well. If the identity of the father is a mystery, Naruko could be on a quest to figure it out. Or if it's someone she knows, they could have different reactions to the news. For example, if it's a love interest, they might be overjoyed or terrified depending on their situation. There could also be elements of how the pregnancy affects Naruko's goals and dreams, whether she has to put them on hold or find a way to pursue them while being pregnant.
One possible plot could be about how Michonne adjusts to the news of her pregnancy in a post - apocalyptic world. She might have to deal with finding proper resources for her and the baby's survival.
One possible plot could be about the challenges Kiba faces during the pregnancy. For example, she might struggle with how to continue her normal life while dealing with the physical changes. Maybe she has to hide it at first from certain people in her life.