I'm not sure specifically what the'seilah new story' is about as there's not enough context. It could be a new story in a book, a movie, or some other form of media.
Seilah could be cursed in the new story. The curse makes her lose her memories of being evil. As she wanders around clueless, the Fairy Tail members find her. They initially suspect her but then realize she has no memory of her past deeds. They decide to help her, and in the process, she forms bonds with them. When the curse is about to be broken and she might regain her evil memories, she has to fight against it to stay on the side of good.
In the new story, Seilah might discover a long - lost relative in the Fairy Tail world. This could lead her on a journey of self - discovery and change her alignment from evil to good as she becomes part of a family she never knew she had. For example, she could find out that one of the Fairy Tail members is a distant cousin. This new - found connection makes her question her past actions and strive to be a better person.
Adventure is also a big theme. They could embark on a journey together, like searching for a lost artifact or trying to stop a powerful villain. In these adventures, they grow both as individuals and as friends. In some fanfictions, their adventure takes them to new and unknown lands within their respective universes.
Seilah is another important character. She likely has her own unique personality traits that interact with Natsu's in interesting ways. Maybe she is more reserved at first but as the story progresses, she opens up more to Natsu.
Another plot could be a story set in a different time period. They are transported to the past and have to adapt to the old ways while also trying to find a way back to their own time. In this journey, they rely on each other a great deal and their bond becomes unbreakable.
There's also 'Naruto and Seilah: A New Alliance'. In this fanfiction, their two different worlds collide when a common enemy threatens both. It's full of action scenes where they combine their skills to fight off the bad guys. It also has some really interesting character development for both of them.
Seilah is also a main character in this context. She has her own set of powers and a rather complex personality in the Fairy Tail universe, which can be further explored in fanfiction.
Sure. A lot of fans prefer to write and read stories that focus on the adventure and magic aspects of 'Fairy Tail' rather than adult - themed content. Check out the general 'Fairy Tail' fanfiction sections on popular websites. Some might be centered around Seilah's backstory, her relationships with other characters in a non - romantic or non - adult sense, like her role within the guild or her magical abilities.