I'm not sure of a specific one off the top of my head, but you could also try looking on Archive of Our Own (AO3). It has a large collection of fanfictions. Some stories might have them getting secretly married due to various reasons like to protect their guild or because of a secret mission they are on together. This adds an interesting layer of mystery and drama to their relationship.
One common theme is secrecy and the challenges it brings. They have to keep their marriage from others, which can lead to some really tense situations.
You can try looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a vast collection of fan - made stories, and you might be able to find some great Lucy and Laxus married fanfiction there.
Some fanfictions might focus on how they first fell in love before getting married. It could involve a series of adventures where they gradually realize their feelings for each other. Maybe a dangerous mission where they have to rely on each other a lot, which sparks the initial attraction.
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.
Natsu would probably be really excited and might even challenge Laxus to a friendly fight right at the wedding reception, just for fun. Happy would be flying around, dropping flower petals everywhere and congratulating them. Erza would be very happy but also very strict about the wedding protocol, making sure everything is perfect. Gray would be a bit more laid - back, but still offer his congratulations with a cool smile.
One possible plot twist could be that an old enemy resurfaces on their wedding day, threatening to disrupt the ceremony. Maybe a dark guild that Laxus once fought against comes back for revenge. Another twist could be that Lucy discovers a hidden family secret that might change her relationship with Laxus. For example, her family has some sort of connection to Laxus' past that she was unaware of. And a third plot twist could be that a magic spell goes wrong during the wedding, causing everyone to swap personalities for a while, which would lead to some really interesting and comical situations.
One popular 'natsu and lucy secretly married fanfiction' might be 'A Secret Bond'. It beautifully depicts their relationship in a new light, with lots of tender moments between them as they navigate their secret married life.
One common theme is friendship. They often start as acquaintances or even rivals and gradually become friends. Another theme is adventure. They go on various quests and battles together in many fanfictions.
Yes, there might be some interpretations of such a concept in a family - friendly way. Some fanfictions might focus on the relationship development between Laxus and Lucy in a more innocent, platonic sense and then explore the idea of a family - like bond without going into inappropriate content. For example, it could be about them becoming very close friends and then taking on a parenting - like role for an orphan or something similar.