Falling For You- (260k words, complete)
"In an alternate series of events, Percy saves Annabeth from falling into Tartarus. Too bad he can't save himself. As Annabeth leads the Seven on a treacherous quest to meet him at the Doors of Death, Percy fights through a wasteland of pain, torture and difficult choices. Surrounded by monsters, alone in the darkest corner of the underworld, he starts to question whether he's a good kid anymore."
You can read the story on Ao3. Same username, same title. Thank you all for all the support xxx