Demigod Avenger (a PJO/Avenger Crossover)

After enduring Tartarus and then winning his second war, Percy Jackson is the Champion of Olympus. However, he didn't come out of the war his normal self. He came out broken and with flashbacks and nightmares haunting his mind. In order for Percy to get better, the gods push him to stay with the Avengers. But the ene...