Well, it could be a story where they initially struggle to accept the pregnancy. Gray might be a bit nervous about becoming a father, and Erza could be worried about how it will affect her role as a powerful mage. But as time goes on, they get excited and start making plans for their family.
Maybe the fanfiction could show how their friends react to the news. Natsu might be overly excited and start making all kinds of crazy plans for the baby. Lucy could be the more practical one, offering advice on baby care. And as for the pregnancy itself, there could be some magical elements involved, like the baby having some unique magical abilities even before birth.
In this fanfiction, Erza and Gray could go through different emotions during the pregnancy. They might have some disagreements about where to raise the baby or what kind of life they want for it. However, through communication and love, they work through their differences. The story could also include some action scenes where they have to protect their unborn child from villains who might want to use the baby's potential powers for evil.
The relationship could become more tender. Gray would be more caring towards Erza, always making sure she is comfortable. For example, he might bring her a warm blanket when she is resting.
One idea could be that they discover the pregnancy during a mission. Maybe they are in the middle of fighting some powerful enemy when Erza suddenly feels unwell and realizes she might be pregnant. It could add a whole new layer of drama to the story, with Gray being overly protective.
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.
The theme of redemption can also be found. If one of them makes a mistake or has a dark past, the other can be a source of support and help them redeem themselves. This shows the depth of their bond and how they can be there for each other in difficult times.
In this fanfiction, perhaps Erza and Gray's pregnancy could be the result of a magical accident. They would then need to figure out how to handle this unexpected situation. Their relationship might grow stronger as they face this together, sharing their fears and hopes for the future with each other and their close friends.
The plot could involve Gray and Lucy dealing with the challenges of pregnancy. For example, Lucy might have a difficult pregnancy with some health scares. Gray would be by her side, using his ice magic to keep her cool during hot flashes. Their friends might be concerned and offer different kinds of support. In the end, they welcome a healthy baby into the world.
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.
One possibility could be a story of them preparing for parenthood while still being part of the Fairy Tail guild. They might face challenges like how to balance their guild duties with raising a child. Jellal, with his past, could be worried about being a good father. Erza, on the other hand, would be a strong and loving mother. Their friends in the guild would also play important roles, perhaps helping them with baby preparations and providing support during difficult times.
One common theme is the resolution of unspoken feelings. Gray and Erza often have a complex relationship in the original series, so in fanfics, a kiss can be a way to finally admit their love. Another theme could be a moment of extreme emotion, like after a dangerous battle or a near - death experience.