His Butler, The Wayward Son // Black Butler...
"Cas, we need to kill Lucifer, he's lost it. I'm not going to sit by and watch as he creates destruction with no plan or goal."
"I know Dean, but all of our resources are exhausted. ..there, there is one option, but it's high risk for you and Sam."
"Heh, you understand that high risk is kind of our thing, boo."
"Okay...There's this ring, that was owned by the Earl of Phantomhive, Ciel Phantomhive."
"An Earl?? Earl's still exist? "
"...that's where the high risk comes in..."
Lucifer is on a murderous rampage and without God or any of his weapons, Sam and Dean are screwed. But Castiel finds out about a ring that has the power to kill Lucifer. One catch, it's been destroyed for over 100 years. So the only choice is to be sent back in time to 1897 to retrieve the ring from Ciel Phantomhive. Another catch, he's got one hell of a butler.