So I was just introduced to a very amazing fanfiction. I thought I'd share this awesome AU involving graceless Lucifer. This is a Casifer fanfictions which made it even more awesome because that's such a rare ship to find especially one in such length that's so well written.
Here is the fanfictions link: http://archiveofourown.org/works/9149677/chapters/20787106?view_adult=true
Also if you like it you can check out the art done for it by the equally amazing ~Anko-sensei (https://www.deviantart.com/anko-sensei)who also does just amazing supernatural artwork period.