Adventure is also a big theme. They usually go on some sort of journey or mission. This could be a quest to find a lost magical item or to defeat a powerful enemy. It gives the story a lot of action and excitement.
You can try searching on some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, and you might be able to find great gray and lucy lemon ones there.
There is a fanfiction called 'Natsu, Gray and Lucy's Unusual Day' which is quite interesting. In this story, they find themselves in a strange magical situation that they have to figure out together. It's full of mystery and the characters' personalities shine through. It shows how their different abilities and personalities complement each other.
A good one often has well - developed characters. It should stay true to the personalities of Lucy and Gray from the original 'Fairy Tail' series. Their relationship should be built up gradually, with believable interactions and chemistry.
There could also be a plotline where they both discover a new magic together. While exploring this new magic, they have to train closely and that physical and mental closeness could spark a romantic relationship. Maybe it's a long - lost ice - and - celestial - combined magic that only they can master, and as they figure it out, their relationship evolves.
One great 'lucy and gray lemon fanfiction' story is 'Lucy's Adventure with Gray' which has an interesting plot where they go on a quest together. It has some really cool magical elements.
The 'lemon' aspect, which often implies some level of romantic or spicy content, adds an extra layer of intrigue. Fans enjoy seeing different interpretations of the relationships between these characters, whether it's a Gray - Lucy pairing, a Natsu - Lucy pairing, or some complex love triangle situation. It allows for a lot of creativity in the fanfiction writing, as authors can play with the characters' emotions and interactions in ways that the original series might not have fully explored.
Well, 'The Team's Unity' is also a good one. It's all about how Lucy, Natsu, and Gray work as a team. It delves into their backstories a bit and how they've come to rely on one another. It keeps the story clean and focuses on the positive aspects of their relationships.