Fatal Flaw - PJO x Male oc (AU)

Annabeth Chase finds herself unexpectedly falling for Caine Harlowe, a powerful Nephilim with a lineage tied to Lucifer, whose presence coincides with the ongoing Battle of Manhattan. Caine, torn by the gods' involvement in his mother's death and Luke's tempting offer to join Kronos, struggles with his dual nature and the prophecy foretelling his descent into hatred. His internal conflict is exacerbated by the arrival of Bella Greyson, the obsessive daughter of Hecate, who ignites a passionate but volatile love triangle with Annabeth. The Olympian gods, recognizing Caine's immense, unchecked power and his fatal flaw of fear - specifically, the fear of his own potential and of losing loved ones - warn Annabeth and the Camp Half-Blood inhabitants that his fear will breed anger, then hate, and ultimately suffering. During the climactic battle for Manhattan, Caine, driven by a desire for revenge and self-preservation, ultimately rejects Kronos and Luke. He then confronts Percy Jackson in a fierce duel, winning the battle but choosing to spare Percy's life. The story concludes on a shocking cliffhanger as Annabeth, Percy, and the remaining demigods discover that Caine has freed his father, Lucifer, leaving the fate of their world uncertain.