By accident, I found the fic that I was looking for in this post.
The Promise at the End of This Book by electrolitestar Rating: NC-17 | Wordcount: 7,532 Summary: When Sam finds a way to get Dean out of hell without any deals for his soul and with the help of the Trickster, he jumps at the chance only to find it's too late: Dean has already been saved. Now with Dean out of the hell, Sam, Dean, Bobby, and now Castiel embark on a long journey to end the apocalypse; each one finding what real love and family are really all about. Link: http://community.livejournal.com/deancas_xmas/35831.html
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The Promise at the End of This Book by electrolitestar
Rating: NC-17 | Wordcount: 7,532
Summary: When Sam finds a way to get Dean out of hell without any deals for his soul and with the help of the Trickster, he jumps at the chance only to find it's too late: Dean has already been saved. Now with Dean out of the hell, Sam, Dean, Bobby, and now Castiel embark on a long journey to end the apocalypse; each one finding what real love and family are really all about.
Link: http://community.livejournal.com/deancas_xmas/35831.html