One idea could be that in a post - Dragon Cry adventure, Natsu and Lucy are sent on a mission to a hidden island where ancient dragon magic is said to be sealed. Along the way, they face various obstacles that test their bond, like a powerful sorcerer who tries to split them up. Another plot could involve Natsu losing his dragon slayer powers temporarily, and Lucy having to protect him while they search for a way to restore his powers using the knowledge from the Dragon Cry incident.
Their relationship could develop through shared danger. For example, if they are trapped in a magical maze as a result of the Dragon Cry's after - effects. Natsu's impulsive nature might get them into trouble, but Lucy's strategic thinking gets them out. This mutual reliance can deepen their bond. Also, if Natsu discovers a new side of Lucy, like her hidden strength or a special magical ability she has been suppressing, he may start to see her in a new light, which could lead to a more romantic development.
Well, in many such fanfictions, it often involves Natsu and Lucy having a special connection related to dragons. Maybe Natsu's dragon powers play a role in bringing them closer in a romantic or fated - mates - like way. For example, they might go on adventures together where Natsu's dragon instincts protect Lucy in a more profound way than in the original story, and their relationship deepens as they face various challenges side by side.
The main characters are obviously Natsu and Lucy. Natsu, with his fiery dragon - slayer magic, is a strong and impulsive character. Lucy, on the other hand, is a celestial wizard with a kind heart. In this type of fanfiction, their relationship is the central focus, with their individual traits playing important roles in how their dragon - mate relationship develops.
Natsu, as a dragon, might start off as more wild and instinct - driven. But as he spends time with Lucy, the princess, he begins to develop more human - like emotions such as compassion and loyalty. For Lucy, she may start as a bit sheltered and naive as a princess, but through her adventures with Natsu, she becomes more brave and independent.
One possible plot twist could be that Natsu, as a dragon, has a hidden past connection to the royal family that Lucy belongs to. Maybe he was once a protector of the kingdom in his dragon form long ago. Another could be that Lucy, the princess, discovers she has some sort of magic power that can communicate with dragons, which is a big secret in the story. And a third plot twist might be that an evil force tries to use Natsu's dragon form against the kingdom, and Lucy has to find a way to break the spell or control over him to save both Natsu and her kingdom.
One character that would be interesting to include is Mirajane. She has a motherly and observant nature. She could be the one to nudge Natsu and Lucy in the right direction when it comes to their relationship. For instance, she might arrange for them to go on a mission together that she knows will bring them closer. Laxus could also be in the fanfiction. His powerful presence can create a sense of danger or protection. If there's an outside threat to the guild while Natsu and Lucy are exploring their relationship, Laxus could be at the forefront of defending the guild, which would impact Natsu and Lucy's situation. And don't forget about Cana. She could be the one to create some light - hearted chaos, like daring Natsu and Lucy to do something that ends up bringing them closer, such as a bet that leads to a shared adventure.
As they travel, their bond deepens. They start to rely on each other more. Natsu becomes more protective of Lucy, and Lucy begins to understand Natsu's impulsive nature better.
She might start to blush furiously. Given her character, she is a bit shy when it comes to romantic matters. And then she might start to stammer out a response, not really sure what to say at first. As she composes herself, she could tell Natsu that she has feelings for him too but in a very gentle and sincere way.
One possible scenario in this fanfiction could be that Natsu and Lucy start to realize their feelings during a particularly dangerous mission. They might have a moment of shared vulnerability, like when Natsu protects Lucy from a powerful enemy. Their secret glances and small gestures towards each other start to become more frequent, and they gradually become aware of their deepening connection.