Fallen From Grace

Without his Grace or wings Castiel is human, and is learning the hard way on how to deal with his new status. One night Dean and Sam are awoken to someone banging on the bunker door. What they are met with, is something they would never expect; Castiel, beaten and bloody. What has happened? Will they be able to help the angel, or now, ex-angel? Castiel can't see himself rising the the soldier he once was, or will he stay a human for the rest of his existence?