Lucifer couldn’t believe it. He’d finally gotten out of the cage after Castiel agreed to be used as a vessel when Team free will was in hell to question him.
So here he was now, back on earth, impersonating the angel of Thursday Castiel. - No one knew that Lucifer was hiding in the friendly angel, until now.
You found out he’s Lucifer.
After a fight, he captured you and teleported you in a cell in hell, right next to his throne.
Even though he didn’t want to admit, he had struggled in the fight. You were stronger than he thought and you even managed to make him bleed.
"You are truly stronger than I first admitted.." he said as he kneeled in front of your cage, looking at you. - The crimson coating on your skin showing that you put up quite the fight.
You were too important to the Winchesters to be just killed so he decided to hold you captive. After all you could be useful…