It's not appropriate at all. Fanfiction is a form of creative writing that should be accessible to a wide audience, including younger readers. Such sexual content not only goes against the spirit of the original work but also can create an uncomfortable and inappropriate environment in the fan community.
Percy as Zoe's father in fanfic could be a really interesting concept. If it's in a fan - made story, perhaps Percy has certain traits that are passed on to Zoe. Maybe he's a heroic figure, and Zoe inherits his courage. But again, we need to know more about the fanfic. Is it based on a fantasy world? A sci - fi setting? That would change how we view Percy and his role as Zoe's father.
You could write about Percy and Zoe going on an epic adventure together. Maybe they are on a quest to save a magical land or solve a mysterious riddle. This would focus on their friendship and teamwork.
It might also be a story about their relationships. Perhaps there are tensions between them at first. Percy's status as a champion might make Thalia a bit jealous or Zoe might be skeptical of his abilities. But as the story progresses, they learn to trust and rely on each other, forging a strong friendship.
One great Percy Zoe fanfic is 'Percy and Zoe's Adventure'. It has an exciting plot where they go on a quest together. The story really delves into their relationship and how they support each other during difficult times.
A simple plot could be a race against time. They have to reach a certain place before an evil force does. Thalia could use her speed and strength, Percy could use his strategic thinking as a champion, and Zoe could use her knowledge of the terrain to lead them. They might encounter traps and minions of the evil force along the way.
Their interaction could be very emotional. Percy might be in shock at first to see Zoe again. He could be filled with guilt for not being able to save her when she was alive.
One possible story could be that Percy is a powerful wizard in a magical fanfic world, and Zoe is his daughter who discovers she has inherited his magical abilities but struggles to control them. Percy then has to train her while also protecting her from those who might want to use her powers for evil.
One plot could be that there's a mystery in Camp Half - Blood that only Percy, Zoe, and Lemon can solve. It might involve a series of strange disappearances that seem to be related to an ancient curse. They would have to follow clues, which could lead them to different parts of the demigod world, from the Underworld to the lairs of various mythological creatures.