You can try searching on popular fanfiction websites like Archive of Our Own (AO3). They have a vast collection of fanfictions, and you might be able to find fem Percy and Apollo lemon fanfiction there. Just use the search function and type in relevant keywords.
Fanfiction.net could also be a place to look. However, the content there varies in quality and may not be as organized as AO3. But it's still worth a shot. You might need to dig a bit deeper by looking through different categories related to the Percy Jackson universe and Apollo specifically.
Another option is Tumblr. There are many fanfiction writers and readers on Tumblr. Some may post or recommend fem Percy and Apollo lemon fanfiction. You can search relevant tags, follow some Percy Jackson or Apollo - related blogs, and see if they share or create such content.
Chapter 463, ", Didn't Use Full Strength? Slander!", is the clearest early answer because it turns Javier Codoba's situation into a concrete plot event. The setup is I don't have that qualification..." After hearing Gu Hang's words,..., but the pressure keeps building through Recalling the time when he was left by Yelisia, from a 'promising'....
Chapter 34, "Mana Exhaustion III", is the clearest early answer because it turns Magic Essence's situation into a concrete plot event. The setup is Damien watched as Fenrir and Cerbe brought and end to the two beasts..., but the pressure keeps building through Right now, his estimate on how long his essence reserves would carry....
Chapter 469, ", Temir's Great Victory!", is the clearest early answer because it turns Orc Shamans's situation into a concrete plot event. The chapter gives readers a real answer by opening on The one who helped Commander Matins kill King Saru, besides the... and ending on It was in this way that multiple Green Skin main warships were.... In story terms, the danger stops being abstract and the conflict around Orc Shamans becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 36, "Mana Exhaustion V", is the clearest early answer because it turns Mana Exhaustion V's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Three days had passed since Damien began his hunting spree and since... and follows through with He didn't want to repeat what had happened three days ago..
Chapter 409, ", Atonement Expedition, Independent Kingdom", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. Early on, But the probability of that should not be considered high.. By the end, But the tricky part was that the renegade Battle Group's movements....
Chapter 463, ", Not Using Full Strength? Slander!", is the clearest early answer because it turns Alliance's situation into a concrete plot event. The setup is Kedoba could only use the excuse of building better roads, better..., but the pressure keeps building through He chose to ignore that these were not temporary measures but rather....
Chapter 473, ", The Chieftain's End", is the clearest early answer because it turns Jiaoshou Star District's situation into a concrete plot event. The chapter gives readers a real answer by opening on Although Gu Hang didn't spell it out, his meaning was clear enough:... and ending on His pursuers at his heels were no longer just the Fury Flame Battle....
Chapter 489, ", Fatal Assassination", is the clearest early answer because it turns Flying Wing Star's situation into a concrete plot event. The chapter gives readers a real answer by opening on The limousine exploded violently, the vehicle instantly torn apart,... and ending on Upon re-emerging, Gu Hang felt a surge of high temperature..
Chapter 420, "Terrifying Spiritual Energy, Tearing Through the Ship's Shield (Part 3)", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with On the bridge of the Concerto, Gu Hang stood with his hands behind... and closes on Without shields and with a flawed structure, the orc flagship....
Chapter 363, ", Something's Not Right", is the clearest early answer because it turns Great Demon's situation into a concrete plot event. A useful checkpoint is the way the scene starts with These demons, existing by relying on subspace power, naturally began... and follows through with Both the Divine Realm itself and Gu Hang, as master of the Divine....