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.
A plot could involve a powerful villain who targets Erza because of her pregnancy. Naruto, being the strong - willed ninja he is, vows to protect her. They start a journey to find a way to defeat this villain once and for all. Along the way, they face many obstacles. Erza's pregnancy brings out a more tender side of Naruto, and he starts to think about building a family. Erza, on the other hand, is worried about how her pregnancy will affect her combat abilities. But with Naruto by her side, they face every challenge head - on.
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 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.
Perhaps there is a prophecy that only Naruto and Erza together can fulfill. They start off as strangers but as they journey to fulfill the prophecy, they discover that they have a lot in common. They both have a strong sense of justice and a will to protect their friends. As they face numerous enemies and obstacles, their friendship turns into a deep respect for each other's abilities, and they become a formidable team.
One possible plot could be that Naruto and Naruko face various challenges while expecting their child. For example, they might have to deal with threats from old enemies who see their unborn child as a potential target. Naruto, being the Hokage, has a lot of responsibilities, and now he has to balance that with taking care of a pregnant Naruko. They could also have some cute moments, like Naruto trying to learn how to cook for Naruko to satisfy her pregnancy cravings.
In this fanfiction, perhaps Erza is found by Naruto when she's injured. Naruto takes her back to Konoha. Since he has a big heart, he wants to give her a home. As she recovers, they start to bond. Erza might be amazed by the chakra system and Naruto could be intrigued by her magic. They could then go on adventures together, with Naruto protecting her like a father figure at first, and later they become equal partners.
One possible plot could be that Naruto, while on a mission in a strange dimension, meets Erza. They initially clash due to their different ways of handling things but gradually fall in love. Naruto then decides to stay in Erza's world and they get married, facing challenges from both their friends and enemies who are skeptical of their union.
One possible plot could be that Naruto somehow gets transported to the Fairy Tail world before Erza is born. He then meets Erza's mother and gets involved in her life. Eventually, he becomes a father figure to Erza as she grows up, teaching her some of his ninja skills and values from the Naruto universe.
Maybe Naruto is on a mission to a place that has some connection to Erza's world. They meet by accident and at first, they don't get along because of their different ways. But as they learn more about each other's pasts and struggles, they start to respect and like each other. Eventually, during a festival in a village they are passing through, they get caught up in the moment and kiss.
Well, one possibility could be that Naruto, with his strong sense of justice and his own experiences of growing up alone, takes Erza under his wing. He might teach her some of his ninja skills, like how to move stealthily or use chakra in a new way. And Erza, being the strong - willed character she is, would adapt these skills into her own fighting style.
In this fanfiction, perhaps Naruto discovers his connection to Erza later in life. It could start a whole journey of self - discovery for him. He might travel to different dimensions or meet characters from Erza's world. This could lead to new alliances and conflicts. He may also learn new magic - like abilities that he combines with his ninja chakra, creating a whole new form of combat that no one has seen before in the Naruto universe.