“It's now very common to hear people say, 'I'm rather offended by that.' As if that gives them certain rights. It's actually nothing more... than a whine. 'I find that offensive.' It has no meaning; it has no purpose; it has no reason to be respected as a phrase. 'I am offended by that.' Well, so fucking what."
― Stephen Fry (on censorship) 

Yes, Master! by zation

Yes, Master! - zation

This is a consensual slave fic in which Dean puts himself up for auction but is allowed to chose his master. Between Michael and Cas, no contest!

Source: http://archiveofourown.org/works/22691566

Suck It Up by strangeandcharm

Suck It Up - strangeandcharm

An excellent fanfic in which Dean is made a vampire and Castiel and Sam have to handle the consequences.

Source: http://archiveofourown.org/works/14805329

The Bone Eater by metarachel

The Bone Eater - metarachel
An excellent fanfic, not for the squeamish, non-con.
Source: http://archiveofourown.org/works/9167437

Plus One by ceeainthereforthat

Plus One - ceeainthereforthat

An excellent fanfic in which Castiel hires actor Dean to stand in as his 'plus one' for three weddings. But things just turn out differently.

Source: http://archiveofourown.org/works/5042650

Painted Angels by WinJennster

Painted Angels - WinJennster

Dean lets the love of his life slip away because he can't handle his drunken father's slurs. Twelve traumatic years later, he gets a second chance. Skimmed some.

Source: http://archiveofourown.org/works/1085792

A Beginner's Guide to Communing with the Dead by suspiciousflashlight

A Beginner's Guide to Communing with the Dead - suspiciousflashlight
An excellent fanfic, voices Dean to perfection.
Source: http://archiveofourown.org/works/1032284

Caniformes by give_it_a_little_nudge

Caniformes - give_it_a_little_nudge

Wow, took me a month to read this super long fic, the longest in the supernatural fandom on AO3. This epic covers only 7 months in time excluding the 'Then' sequences and the epilogue. A well written fic with excellent world building, some scenes are not for the squeamish.

Source: http://archiveofourown.org/works/10686864

Russian to the Altar by MalMuses

Russian to the Altar - MalMuses

A well written fic in which Dean agrees to marry Castiel to aid his immigration into the USA. The guys fail to communicate their feelings when the marriage becomes more than just fake. Skimmed some.

Source: http://archiveofourown.org/works/20238709

Light in the Dark by Taybay14

Light in the Dark - Taybay14
This is a very dark slavefic in which Dean is kidnapped by slaver Castiel. Castiel and his brother Gabriel supply sex slaves to the great and the good. Lapped it up.
Source: http://archiveofourown.org/works/19273210

Oddly Shaped Empty by jemariel

Oddly Shaped Empty - jemariel

A well written fic in which beta Dean has never succeeded in a relationship. Then alpha Castiel becomes his new room-mate.

Source: http://archiveofourown.org/works/14711096

Coming Undone by KouriArashi

Coming Undone - KouriArashi

An absorbing fanfic with an excellent plot. The author voices Stiles to perfection. No sex.

Source: http://archiveofourown.org/works/558985

Love What is Behind You by KouriArashi

Love What is Behind You - KouriArashi

An excellent Steter fanfic in which Stiles and Allison are contestants in the 'Survival Games.'

Source: http://archiveofourown.org/works/10169759

You Had Me at Canapes by LadyArinn

You Had Me at Canapes - LadyArinn

A fanfic full of Steter snark with a gush of plot towards the end.

Source: http://archiveofourown.org/works/7178927

Under the Songbird’s Wing by mia6363

Under the Songbird’s Wing - mia6363
A heartbreaking fanfic in which sixteen year old Stiles finds himself held captive along with three alpha werewolves. Some typos.
Source: http://archiveofourown.org/works/11509980

Truth and Consequences by KouriArashi

Truth and Consequences - KouriArashi

An enjoyable well-written fanfic. No sex.

Source: http://archiveofourown.org/works/14716970

When You're Going Through Hell (Keep Going for Me) by cywscross

When You're Going Through Hell (Keep Going for Me) - cywscross

A well written fic in which Peter and Stiles meet in the basement cells of Eichen House. Second half is a bit plotty, skimmed towards the end. No sex.

Source: http://archiveofourown.org/works/17132132