The Promise of the Wild Sea by andromexa

Fem!Percy/Apollo

Phoebus Apollo was eternally cursed with misfortune in matters of the heart. This sorrowful truth echoed through the ages, a tale told and retold, etched in art and memory. His lovers were immortalized in paintings and sculptures, their stories celebrated far and wide. Yet, one beloved remained cloaked in shadows, a secret he guarded with fierce devotion. Callista, a Trojan princess, was meant to shine with power, her deeds standing tall beyond his luminous association. But, to Apollo's dismay, humanity erased her from history, condemning her to obscurity. The world may have forgotten Callista, her heroic legacy buried by historians' neglect. But Apollo never would. Her memory burned bright within him, an eternal flame.

But what would happen when, thousands of years later, the sun god encounters his ancient lover reincarnated in the form of a young demigoddess, who is entwined with a great prophecy, named Persephone Perseus Jackson? The moment he sees her, the forgotten tale of Callista breathes anew. In this young demigoddess, the spirit of his beloved princess lives on, poised to defy fate and reshape history. The past and present collide rekindling a flame that never truly died.

All credit goes to andromexa. This is their original story on AO3.
Here is the link if you would like to check it out.https://archiveofourown.org/works/56157019/chapters/142654540
You can also find andromexa on tumblr under perseabeth.

Highest Ranking:
#6 in hera
#7 in trojanwar
#27 in camphalfblood