One idea could be that in a world where Natsu is female, she and Gray are paired on a difficult mission. They have to work together to defeat a powerful dark wizard. Along the way, they start to understand each other's fighting styles better and develop a mutual respect that turns into a budding friendship. Maybe Natsu's more emotional side as a female adds a new dynamic to their interactions.
In the fanfiction, their relationship might develop through their shared love for a particular type of magic or magical item. Let's say there's a rare magical crystal that has properties related to both fire (Natsu's element) and ice (Gray's element). They both embark on a quest to find this crystal. During the journey, they face many challenges together, and their bond grows stronger as they rely on each other's skills.
Gray would be extremely angry. He would immediately start looking for clues as to where Natsu was taken. His ice - make magic would be on full display as he might freeze things in frustration while trying to figure out the situation.
One great example could be 'A New Bond' which explores the relationship between Fem Natsu and Gray in a unique way. It might show their interactions during a difficult mission, with lots of character development and some sweet, friendly banter. Another one could be 'Frozen Flames' where their powers interact in an interesting manner as they face a powerful enemy together.
Fem Natsu's fiery and passionate nature often clashes with Gray's cool and collected personality. In fanfictions, this can lead to some really interesting dynamics. For example, they might argue over battle strategies, but in the end, find that their combined approaches are more effective.
I'm not sure if there is such a specific fanfiction. There are a vast number of fanfictions out there, and while some might explore unique and even out - of - the - ordinary concepts like this, it would take some searching through relevant fanfiction platforms to determine its existence.
One possible plot could be that the kidnappers are from a rival guild who want to use Natsu as leverage against Fairy Tail. Gray could then embark on a solo mission to rescue Natsu, facing various traps and enemies along the way. He might have to use his ice - make magic in creative ways to overcome obstacles.
Another interesting one is 'Gray and Natsu: Beyond the Guild'. This fanfic explores what would happen if Gray and Natsu left the Fairy Tail guild for a while. They end up in a strange land where they have to rely on each other to survive. It delves deep into their friendship and shows how they grow as individuals and as a team. The descriptions of the new land are really vivid and add to the overall charm of the story.
Romance is also a big theme. Many fanfictions play around with the idea of a romantic relationship between female Natsu and Gray. They might have some cute moments like blushing or secretly caring for each other.
A more detailed title could be 'In the World of Fanfiction: Fem Natsu's Journey After Betrayal'. This title not only mentions the main idea of fem natsu being betrayed but also implies that there will be a journey or development in the fanfiction that follows the betrayal.