The Lost Daughter of the Sea (a Percy Jackson fanfic)

The demigods thought that they might get a break after the war, but of course a month or two after it ends Ella begins to spout lines of a prophecy: another prophecy of the heroes of the Argo 2. When the entire prophecy is finally remembered some surprising news is revealed. Poesidon and Sally have been keeping a secret from Percy, one that leaves him shocked. He has a secret twin sister that has been living in Greece in for her entire life. Now however they need to find her and figure out what exactly is blocking the Spirit of the Oracle of Delphi and how to undo it or else... the demigod world will never be the same. No more quests, no more prophecies(which may not be a bad thing in Percy's opinion) and no more Oracle. With help from Andromeda, the lost daughter of the sea, they might be able to do it but not with out some new relationships( thanks to Aphrodite), new drama, and many, many changes that the demigods will just have to... adapt to.