In many fanfictions, Wendy and Lucy's relationship is developed when they help each other with their magical training. Wendy might teach Lucy about some of her unique dragon - slayer magic techniques, and Lucy could share her celestial spirit knowledge with Wendy. As they learn from each other, they become closer. Also, there could be situations where they protect each other from the judgment or jealousy of other guild members, which cements their relationship further.
A common way is to create external conflicts that bring them closer. Maybe the guild is facing a big enemy and Laxus and Lucy have to combine their powers. During this process, they start to trust each other more. Writers also like to include some internal conflicts within the characters. For Laxus, it could be his past issues with trust, and for Lucy, it might be her insecurities. As they overcome these together, their relationship deepens. And sometimes, they'll just have simple, everyday interactions that slowly but surely turn into something more romantic, like sharing a meal or a walk in the guild hall.
Often, their relationship develops through shared experiences. Maybe they get stuck in a magical realm together. There, they have to work together to find a way out. In this process, they might have arguments at first because of their different ways of doing things. Erza is more of a strict and by - the - book type, while Lucy is more spontaneous. But as they face difficulties, they learn to compromise and grow closer. In some fanfictions, this eventually leads to a very strong friendship where they are almost like family to each other.
In many mature fanfictions, their relationship develops through shared hardships. For example, they might face a powerful enemy that forces them to rely on each other more deeply. This can lead to a greater understanding and a more intense emotional connection between them.
At first, their relationship might be one of mutual curiosity. Naruto would be intrigued by Wendy's magic, and Wendy would be fascinated by Naruto's ninja abilities. As they face challenges together, they would start to trust each other more. For example, if they are in a battle against a strong enemy, Naruto would rely on Wendy to back him up with her support magic, and Wendy would depend on Naruto's combat skills.
Writers often start with small moments of interaction. For instance, a simple conversation between Sting and Yukino where they share their dreams can be the starting point. Then, they gradually build on these interactions. They might add in some jealousy plotlines, like when another character shows interest in Yukino and Sting gets jealous, which reveals his true feelings.
Their relationship could develop through shared secrets. For example, they might discover something about the guild's past that they decide to keep between themselves. This would create a special bond.
To develop their relationship, start with small interactions. Have the OC offer to help Lucy with her celestial spirit summoning, like finding a rare ingredient for a spirit - summoning spell. Then, they could have some shared experiences, such as getting trapped in a cave during a mission. This forces them to rely on each other, talk, and get to know one another better. Another way is to give them common goals. For example, they both want to defeat a certain dark mage who has been causing trouble in the area. Working towards this goal together will bring them closer.
Often, in fanfiction, a common plot is that Juvia and Lucy are paired up for a task. This forced proximity makes them learn about each other. Lucy might introduce Juvia to new ways of using magic in a more creative way, while Juvia shows Lucy how to be more in tune with her emotions. As they face difficulties together during the task, they build a bond of trust. This trust then evolves into a deep friendship where they are always there for each other, whether it's cheering each other on during a magic competition or comforting each other after a loss.
Their relationship might develop in a more emotional way. Maybe one of them gets injured during a battle, and the other is extremely worried. This concern could make them realize how much they care for each other. They could then start to open up about their fears and dreams, which would bring them closer together. They might also discover that they have a lot in common in terms of their goals within the Fairy Tail guild.
Their relationship could develop through training sessions. As they train together, they learn more about each other's strengths and weaknesses, and a bond of mutual respect forms.