Waiting (A CastielxOC story)

Everyone has thier secrets, and nineteen year old Rosalin Umbrage is no exception. Being born of demon and angel, she isn't exactly anyones definition of normal, especially where Supernatural hunters Dean and Sam Winchester are concerned. Too bad for her that her unnatural lineage isn't her only problem. As fate would have it, a prophecy proclaims that she will bare lucifer's child which will in turn destroy heaven. Castiel, an Angel of the Lord refuses to let this come to pass though. Having known Rosalin almost her whole life and being the one who dropped her into Dean and Sam's arms in the first place, he is her secret and loyally devoted Guardian Angel. But can he, Sam and Dean really change her fate when the whole demon world and the big kingpin, Lucifer himself are after her? (Takes place halfway through season 4.)