It wasn't long before a glorious battle had ensued between 'Team Free Will,' and the Devil. It was clear who was more powerful, especially once both brothers had been beaten nearly unconscious, helpless but to watch as Lucifer grabbed Castiel by his collar.
"Any last words?" Lucifer asked.
To Lucifer's surprise, Castiel actually spoke. "Can you really defeat the Darkness?"
Lucifer smiled, "I can."
"Then 'yes.'" Castiel consented quietly, too quietly for his friends to hear and protest.
Lucifer accepted the word, and hurried his way into his new vessel.
The Darkness had better beware. Because, baby, Luci was home.