It's A Family Thing

This story starts right after Meg dies. When she figures that her death is unavoidable she gives a set of coordinates to Sam and tells him to protect what he finds there with his life. When Sam and Dean arrive at the given coordinates they find an abandon house, but inside find a girl. Meriah is not just any girl. She is the offspring of an Angel and a Demon. Meriah is the daughter of Castiel and Meg. Half Demon. Half Angel. And half human. Will Meriah turn out to be Sam and Dean's greatest ally or greatest enemy? Which parent will she take after the most? Read and find out.