PJO Fanfic

Poseidon met Samantha Jackson (the first reincarnation of Sally Jackson) in late 1939. They had a child named Lilly Jackson. In 1944, when Lilly was five years old, Samantha was drafted into the war to be a nurse. While Samantha was away, Hans Richardson, Lilly's stepfather, used this opportunity to get drunk (something Samantha never allowed him to do) and lash out his anger on young Lilly. Deciding that she had had enough of it, Lilly runs away and meets Bianca and Nico di Angelo, who believe her when she tells them about the monsters that come after her. After learning that Nico and Bianca went missing after their mother's death, Lilly is determined to find them, only she falls into Tartarus while doing so. By the end of Mark of Athena, when Percy and Annabeth fall into Tartarus as well, they find Percy' s long lost sister, who, since being in Tartarus, did not age, and find the Doors of Death.

Disclaimer: Main characters like the crew of Argo II belong to Uncle Rick. Lilly is my own creation.