The Unknown and the Greeks (PJO x Male reader insert)

Y/N is 13 and living alone. Well actually he doesn't live anywhere right now. At 10 years old, unfortunate things happen in his life. His grandpa dies and he has nowhere to go. Until he meets someone in the forest who knows him, but he doesn't recognize her. She trains him for 3 years, but suddenly stops communicating with him. He travels around the United States until he ends up in New York. He spots 3 people being chased by a bull man. Find out what happens next!

All character besides Y/N belong to Rick Riordan