Percy Jackson mystery sibling meets Avengers

This isn't like the original series, many things have changed.

Percy Jackson: a hero, a leader, a brother. After the giant war with Gea, dirt face, both him and his younger sibling have trouble moving on. They decide to leave camp, and their almost non-existent friends, and head back to New York. The place they were born in. The place their mother was killed. The place a new war containing the Avengers and Loki had just struck. What happens when they meet? What happens when just as they think they've won, a worse enemy comes into the light?