Yes, there are quite a few out there. Some fanfiction platforms like Archive of Our Own (AO3) have a wide range of such stories. You can search using the tags related to Percy Jackson, Luke Castellan, and the gay relationship to find ones that suit your taste.
There's also 'Percy and Luke: A Different Path'. This fanfiction takes a different approach. It imagines if Luke had made different choices early on. Percy plays a key role in guiding Luke towards a better path, and their relationship blossoms as they both learn and grow together.
Yes, there are quite a few. You can find them on popular fanfiction websites like Archive of Our Own. Some explore their relationship in alternate universes where they overcome the animosity from the original series and develop a romantic bond. It often delves into the complex emotions and character development that could lead to such a relationship.
One common theme is the struggle against fate. Since they are in a rather complex situation in the original story, in yaoi fanfiction, they often have to fight against the expectations of the demigod world to be together.
AO3 (Archive of Our Own) is a great place to start. It has a large collection of fanfiction, and you can easily search for stories about Percy and Luke with the gay relationship tag.
Annabeth could be a great supporting character. She has a complex relationship with both Percy and Luke. Her intelligence and strategic mind could help in any quests or battles that Percy and Luke are involved in, whether they are on the same side or opposing each other. Also, her knowledge of the demigod world's history and lore would be invaluable.
One idea could be a pre - series fanfic where Luke and Percy meet as kids before all the chaos. They could become friends briefly and that friendship could add an interesting layer to their later enmity. Another could be a fanfic where Luke is given a second chance after his fall and has to work with Percy to redeem himself. Maybe they have to go on a quest together to save someone important from a new threat in the demigod world.
The popularity of 'Percy Jackson x Luke Castellan' fanfictions can be attributed to the complex relationship between the two characters in the original series. They are sort of enemies but also have a lot of potential for a deeper connection. Fanfic writers love to explore that gray area between hatred and friendship.
The fact that they start off as adversaries in the main story makes them an exciting pair in love fanfictions. It allows for a lot of character growth and development within the context of a relationship. There's also the aspect of redemption in some cases, where Luke might be redeemed through his love for Percy. And the whole demigod world they inhabit provides a rich backdrop for exploring their relationship, with all the magic, quests, and power dynamics that come with it.
One popular trope is the 'forbidden love' angle. Since Percy and Luke are on different sides in the original story, in fem Percy and Luke fan fics, this can be intensified. Their love is something that goes against the rules of their world, like the demigod/godly politics. Another is the 'power couple' trope. Fem Percy with her powers and Luke's own skills could be seen as a force to be reckoned with. They might team up against common enemies in ways that deviate from the original plot.