A typical storyline could involve their wedding day. It might describe how all their friends from the Fairy Tail guild come together to celebrate. There could be lots of emotional moments, like Natsu seeing Lucy in her wedding dress for the first time.
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.
There's a fanfic titled 'Married Life in Magnolia' which focuses on their day - to - day married life. It includes Natsu being his usual goofy self and Lucy trying to keep him in line while they both deal with the challenges of being a married couple in the Fairy Tail guild.
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.
Well, one possible plot could be that after many adventures together, Natsu finally realizes his deep love for Lucy. He might plan a big, romantic proposal during one of their guild parties. Then the wedding could be a grand affair with all their Fairy Tail friends in attendance. They could exchange heartfelt vows, and the whole guild could celebrate their union with lots of food, music and magic.
I think characters like Makarov, the guild master, would be there. He could give a really heartwarming speech about how he's seen Natsu and Lucy grow. Wendy and Carla would also be guests. Wendy might be helping with some of the decorations, using her magic in a creative way, and Carla would be there to keep Happy in line and also enjoy the celebration.
Maybe the story could start with Natsu and Lucy going on a special mission. During this mission, they face a great danger that makes them realize how much they mean to each other. Once they return, Natsu decides it's time to get married. The fanfiction could then focus on the wedding preparations, like Lucy choosing her dress and Natsu trying to find the perfect gift for her.
One common theme is the element of surprise. Since their friends don't know about their marriage, there are often scenes where they almost get caught or where their friends start suspecting something. Another theme is growth. As they keep this secret, they grow closer and learn more about each other on a deeper level.
You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own (AO3). On Fanfiction.net, use the search function and type in 'Natsu x Lucy married'. AO3 also has a great tagging system. Just search for the relevant tags and you'll find a variety of stories.
The main characters are obviously Natsu and Lucy. Natsu is a powerful and hot - tempered mage, and Lucy is a celestial wizard. Their different personalities and magic abilities make their relationship interesting.