Percy Jackson and the Hecate Prophecy: an epilogue series

Percy Jackson and his wife, Annabeth, now living in downtown San Francisco, had a child named Leo Nico Jackson, after two of his parent's greatest lost friends from battle. Unfortunately, a child Hecate seemed to like. When Leo was born, she came to the Jackson Manor to see the baby. Her oracles had proclaimed a prophecy of a water-born wizard who awaited great struggles in his life, with many accomplishments along the way. Hecate told the Jacksons that Leo didn't belong so far away from his journeys, and Annabeth and Percy finally came to agree that they would leave their child in the hands of Chiron, so Leo could train like his mother did as long. Until a certain sword brings a monster to camp....