AU where Percy and co rescue Nico from Thorn at the start of TTC, but not Bianca, who's shipped off to Titan HQ and pressed into service.
And she thrives.
Not at first, of course--she's scared, and angry, and incredibly confused by this brand new world she's been plunged into. But life in the Titan army isn't so different from the rigid atmosphere of military school, and since she knows that Nico, at least, is safe, it doesn't take long for her to start appreciating her newfound freedom (so to speak). Housed in the girls' barracks and put through training, she makes friends and a name for herself as a very powerful demigod. She isn't sure she's on board with overthrowing the Olympians--she can't hate her father, she doesn't even know him--but between the respect she earns and the rush of finally, finally being free to be herself, she finds it ever easier to play along.
And all the while, Nico is at Camp Half Blood, training furiously to rescue her, unaware that she may not even want rescuing.
