You can try fanfiction platforms like Archive of Our Own (AO3). There are a large number of Percy Jackson fanfictions there. Just use the search function and look for ones related to 'Fem Percy' and maybe even include 'Artemis' in the search terms if you want stories that specifically connect to Artemis's want. It's a great place to start exploring.
One possible storyline could be that Artemis sees the potential in Fem Percy as a powerful female figure in the demigod world. Maybe she takes Fem Percy under her wing to train her in unique ways, away from the more traditional male - dominated training in Camp Half - Blood. This could lead to Fem Percy developing new skills and a special bond with Artemis.
It's quite a wild concept for Artemis to want a baby with Percy in fanfiction. If it were to happen, it could be a part of an alternate universe type of fanfic. The author might have to deal with the reactions of other characters in the Percy Jackson universe. For example, how would Athena, who is often at odds with Artemis, react? And Percy himself would have a lot of internal conflict, considering his loyalty to Annabeth in the original stories. So, while it's an out - there idea, it could lead to some really complex and engaging fanfiction stories.
The male gods would be the most likely opponents. Gods like Zeus, Poseidon, and Apollo might not be happy with Fem Percy and Artemis's ideas of a female - dominated world or their dislike for boys. They would see it as a threat to their power and the existing order of things.
If Artemis wants a baby with Percy in fanfiction, it could change the power dynamics in the story's world. Artemis might become more protective and less involved in her usual activities as a goddess. Percy, on the other hand, might gain some new powers or abilities related to Artemis's domain. For example, he could have a stronger connection to nature or the ability to control wild animals. This could also create a new set of enemies for them, as some might see their union as a threat to the existing order.
Another option is to check out Percy Jackson - related forums. There are often threads where fans share their favorite fanfictions, and you might find some that involve Artemis and Percy there. These forums can be a great source as the users are really into the series and can give good recommendations.
The relationship between Artemis and Percy is quite unique. Artemis is a powerful and independent goddess, and Percy is a heroic demigod. The idea of them interacting in a fanfiction can lead to very interesting power dynamics and character development. It's like mixing two very different yet strong personalities.
The other gods might be antagonists. For example, Zeus could be against Artemis getting Percy back because he doesn't trust Percy or he has his own plans for Percy that don't align with Artemis'. Another god like Ares could also be an antagonist as he might see Percy as a threat and not want him to be on Artemis' side.
One possibility is that Artemis realizes Percy's unique skills and abilities are crucial for a quest she has in mind. Maybe there's a powerful enemy emerging that only Percy can help defeat. So, she tries to convince Percy to join her side again, perhaps offering him some kind of reward or appealing to his sense of heroism.
Another theme could be mentorship. Artemis, being an ancient goddess, can be depicted as a mentor to fem Percy. She could teach Percy about her powers, the ways of the gods, and how to navigate the world of mythology. This can lead to interesting character development for Percy.