Some Tumblr blogs are dedicated to Fairy Tail fanfiction. Search for tags like #natsuandlucyvampirefanfiction. You may come across some blogs that post links or even write their own natsu and lucy vampire stories. Additionally, Wattpad might also have some interesting ones if you search thoroughly.
One great natsu and lucy vampire fanfiction could be 'The Vampire's Heart'. In this story, Natsu might be a vampire who has been living in the shadows for centuries. He meets Lucy, a human with a special allure. Their relationship starts off rocky as Natsu tries to resist his urge to bite her. Another interesting one could be 'Vampiric Love'. Here, Lucy is a vampire hunter who falls in love with Natsu, an unexpected vampire. It adds an exciting twist to the typical vampire - human relationship.
They can develop their relationship by having small, everyday moments. For example, sharing breakfast together as a family, where they talk about their plans for the day. Natsu could show his love for Lucy by being more protective of her and their family in dangerous situations. Also, they could have inside jokes that only their family understands, which would strengthen their bond.
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.
Natsu would likely be extremely guilty. He might immediately stop whatever he was doing and rush to Lucy's side.
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 aspect of their married life in fanfiction could be the domestic side. Lucy might try to get Natsu to be more organized at home, while Natsu would bring his energetic and fun - loving nature into their household. They would probably have a lot of cute and comical moments, like when Natsu accidentally burns the dinner and Lucy just shakes her head and laughs it off. Their love would continue to grow as they share these everyday experiences.
In fanfiction, Natsu and Lucy's love story is often filled with tender moments. They have a natural chemistry in the original series that fanfic writers expand on. For example, some stories might focus on how Natsu realizes his deeper feelings for Lucy during a dangerous mission. He protects her more fiercely than ever, and in those intense moments, their bond deepens into something more romantic.
In 'natsu falls in love with lucy fanfiction', the author might focus on building the relationship gradually. They could start from small interactions that gradually grow into deeper feelings. For example, they might describe how Natsu starts to notice Lucy's little quirks and how those things become endearing to him, leading to his love for her.
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.