“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) 

Red In Tooth and Claw by glasslogic

Red In Tooth and Claw - glasslogic

An excellent sequel to 'The Cause Sanguine.' Sam and Dean become involved in collecting a cursed mirror and all hell breaks out.

Source: http://archiveofourown.org/works/344283

The Cause Sanguine by glasslogic

The Cause Sanguine - glasslogic

An engaging fanfic in which Dean befriends a wolf who turns out to be werewolf Sam.

Source: http://archiveofourown.org/series/15369

Honey and Flies by glasslogic

Honey and Flies - glasslogic

A well written novella in which Dean encounters Bobby's foster son Sam after he woke up in the morgue.

Source: http://archiveofourown.org/works/336114

In Arcadia Ego Series by glasslogic

In Arcadia Ego Series - glasslogic

An excellent series in which vampire Dean strikes a deal with hunter Sam to supply the vampire with blood. Meanwhile Sam is puzzled by the animosity of his fellow hunters.

Source: http://archiveofourown.org/series/15311

Surfacing Taken by imonlyobsessed

Surfacing Taken  - imonlyobsessed

Despite the odd title, this is a well written fanfic in which Sam and Dean become involved with BDSM on a hunt.

Source: http://archiveofourown.org/works/3990766

A Mile in My Shoes by ADeedWithoutaName

A Mile in My Shoes - ADeedWithoutaName

A humourous fanfic in which Dean and Sam exchange eating and exercise habits for six weeks. Dean becomes attracted to Sam's increasing girth. Meh, not my kink.

Source: http://archiveofourown.org/works/13555566

Flight Risk by TwoBoys2Love

Flight Risk - TwoBoys2Love
Jensen is a socially-challenged family doctor. Jared is running away from an abusive partner when Jensen hits him with his car. They are drawn to each other but hampered by Jared's trust problems and Jensen's 'friend with benefits' relationship with Jeff.
Source: http://archiveofourown.org/works/2044173

Somethin’ Like Soulmates by Chuchiwan

Somethin’ Like Soulmates - Chuchiwan
3.5 stars. Sam Campbell is an omega masquerading as a beta to further his law career. Then he meets alpha Dean Winchester working in a bar. This is a first spn fanfic by Chuchiwan, the plot holds up pretty well but the author needs a beta to field the typos.
Source: http://archiveofourown.org/works/13357611

A Touch of Evil by nyxocity

A Touch of Evil - nyxocity

An extremely dark J2 fanfic in the style of Dexter. Jensen Ackles is a forensic pathologist and serial killer of his fellow murderers. His sister Daneel is a police detective. His life is overturned when he comes into contact with trauma surgeon Jared Padalecki. 
An accomplished piece of writing, not for the squeamish.

Image by monkeyJade
'Jensen shouldn't… but he wants. Fuck, he wants. Want such as he has never known, wrapped in wonder and dripping with sin, straining at the end of its chains.'

Source: http://archiveofourown.org/works/12546612

Eat You Alive by thecapn

Eat You Alive - thecapn

An excellent J2 fanfic, beautifully written. Sadly the author's only major work :(

Source: http://archiveofourown.org/works/875793

You Be the Prom Queen, , I'll Be the Malcontent by Chash

You Be the Prom Queen, , I'll Be the Malcontent - Chash

A competent amusing fanfic in which construction worker Jared falls for violinist Jensen.

Source: http://archiveofourown.org/works/259184

Switched by Smokengote

Switched - Smokengote

This is an engaging first fanfic from smokengote. Prior to defeating Amara, there are two omega brothers and two alpha brothers, each pairing in their own universe. Then omega Dean is switched with alpha Dean, ending up in a universe where omegas are an oppressed gender.

Source: http://archiveofourown.org/works/6651103

Isn't He a Doll? by anyothergirl415

Isn't He a Doll? - anyothergirl415

An engaging fanfic in which robotics genius Jared creates 'Arti' Jensen to help him learn to interact with dating partners.

Source: http://archiveofourown.org/works/333849

Say A Prayer and Close Your Eyes by: Annie46fic

Say A Prayer and Close Your Eyes - Annie46fic

Dr Jensen enters a relationship with mentally challenged adult Jared.

Source: http://archiveofourown.org/works/371446

Offering by shaylea

Offering  - shaylea

Wow, an excellent J2 fanfic featuring Jared and Jensen as college roommates. Chock full of hot sex and Angst with a capital 'A'.

Source: http://archiveofourown.org/works/11828313

I Am Positive by AsexualDerek

I Am Positive - AsexualDerek

Some dark themes in this fic starting with a rape and Stiles' subsequent pregnancy.

Source: http://archiveofourown.org/works/846010