Castiel was your son,born from a normal mother and you,his Slayer father,your wife died at birth leaving you and Cas. One day the Vampire Lord Marion massacred the whole village,except you and your babe.You thought that you'll get away,but he got your son first,biting down towards that soft flesh as you hear your son wail,begging for you to help him,in one moment you killed Marion,but you see Cas successfully sired and sitting at the chair you two always sit at,looking at you with longing.