One of my favorites:

Neighbors (http://archiveofourown.org/works/335329): Jensen is the neighbor from hell. So is Jared. Rec Note: Not a relationship exactly. It's more like a sex relationship. They do not like each other... but they do. I love the complicated dynamics.

Doesn't quite fit:

Winner Gives All (http://archiveofourown.org/works/212143): When Dean and Sam fight to see who tops, sometimes the fight's almost as good as the sex. Rec Note: Sort of PWP, obviously Sam/Dean, not J2.

Violently (http://hunters-retreat.livejournal.com/399016.html): As the brothers try to deal with their violent and volatile relationship, they have to rely on each other to stop the vicious murders that are happening on Sam's old campus. Rec Note: Warning for non-con/duc-con. Can get pretty violent sometimes. Not one of my favs, but not horrible. Not J2.

Does sex while hurt count? Oh, and it's not J2. Okay, so maybe I stink at recing. :) Here it is anyway:

Taking Care of Sammy (https://www.fanfiction.net/s/9492236/1/Taking-Care-of-Sammy): After the events with Gabriel, Dean wakes up to discover Sam is hurt more than he said and must decide how best to take care of his brother when he discovers the best way is something he has no problem giving again. *Limp!Sam & Understanding/caring!Dean* Set after 05x08 Changing Channels. (Sam/Dean).

Fever (http://bksncleverfic.livejournal.com/6729.html): Sam's sick when Dad's away. Dean takes care of him. Rec Note: No actual sex, but they do wrestle and... uh... finish. Also not J2, but hey.