Yes, there are some Percy Jackson and Nyx romance fanfictions out there. You can usually find them on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Percy Jackson Nyx romance' on those sites, and you'll likely come across a variety of stories with different takes on their relationship.
Well, often there's the theme of discovery. Percy discovers Nyx in a new light, perhaps seeing beyond her as a powerful entity to someone he could have feelings for. And Nyx might discover in Percy a sense of purity or courage that she admires. Also, the theme of transformation is common. Their relationship causes both of them to change, Percy might become more in tune with the primordial forces, and Nyx could become more understanding of the demigods. There's also the overarching theme of secrecy, as they may need to keep their relationship a secret from others in the world.
A simple fanfiction idea could be that Nyx senses Percy's unique power and decides to mentor him secretly. She could teach him ancient and powerful magic that no one else knows.
One possible fanfiction could be about Percy having a mysterious encounter with Nyx in the Underworld. Maybe he stumbles upon her realm while on a quest and has to face her challenges.
One possible fanfiction could be about Percy Jackson accidentally stumbling into Nyx's realm. He's initially terrified but then realizes Nyx has a different side to her. They start to have an unexpected connection, and the 'lemon' aspect could be a budding romantic or at least a very intense friendship that has some flirty undertones. For example, Nyx might show Percy some hidden powers that are only known in her domain, and in return, Percy shares stories of his adventures with the Olympians.
A simple idea for such a fanfiction could be that Percy is exploring a new part of the mythological world and comes across Nyx. Their encounter is filled with a sense of mystery and danger. The lemon aspect might be a moment where they share a glance that holds a lot of unspoken emotions. It could be a starting point for a relationship that defies the norms of the Percy Jackson world, like a hero getting involved with a more primordial being.
Nyx in Percy Jackson fanfic often represents the unknown and the primordial forces. She can add depth to the story by bringing in the ancient and powerful elements of Greek mythology. As for the 'lemon', it might be used to create a contrast. Maybe it represents something fresh and new in a world filled with old and powerful deities. It could also be a unique object that has some sort of magical property specific to the fanfic's plot.
Developing his powers further is also a way. Since he's the son of Nyx, he could learn to manipulate different aspects of darkness like creating illusions using shadows or traveling through the dark realms faster. This would not only make him more powerful but also show his growth as a character as he masters these new abilities.
Well, it could be a really interesting story. Nyx is a powerful goddess, and Percy has his own set of powers and a big heart. Maybe the story could start with Percy somehow getting involved in the realm of Nyx. He might be on a quest that leads him to her, and they could start to understand each other over time. Their relationship would be complex due to their different natures, but that's what would make the fanfiction so engaging.
One common theme is the power struggle. Nyx being an ancient and powerful goddess, often there are stories about her power in relation to Percy's abilities. Another theme is the mystery. Nyx is a rather mysterious figure in Greek mythology, and fanfictions like to explore that aspect further.