The Grimm Demigod

Percy Jackson has a secret, a secret no one at camp knows. The thing is his last name isn't even Jackson, its Grimm. He is a descendant of the Grimm Brothers themselves. This would be a cool thing except, well, he has demons coming after him. Demons that want his soul as payment for telling their stories to his ancestors. Just how will he tell his friends? slash, crossover (kinda)