You will not find chan in these recs. My preference is for adult-adult relationships, and I enjoy humour.
The Old Meddler (and sequels)http://www.livejournal.com/tools/memories.bml?user=tales_of_josan&keyword=THE+OLD+MEDDLER+%28SS/PW%29&filter=all
Snape/Percy - yeah I know that sounds weird, but josan really makes it work beautifully.
There are several stories around with this title, but this is the best. Snape/Ron, post-Hogwarts. The warnings include non-con, but the relationship between Snape and Ron is entirely consensual.
Two things I hate, Fabula Rasa made work: Snape/Sirius and Snape-is-a-vampire. S/he's a genius!
Draco/Ginny. Lots of smut, and some intriguing hints of subterranean plots.
Size Queen by Predatrixhttp://predatrix.slashcity.org/fiction/sizequeen.htm
Snape/Hagrid. Not a pairing I would have considered workable, but this one surprised me!
Twenty Years Later by Reba Williamshttp://restrictedsection.org/file.php?file=3834
Harry/Draco (eventually). Twenty years after Voldemort's defeat, Harry and Draco are living as Muggles in America. Harry is a cop and Draco is an academic.
A Thousand Beautiful Things by Duinn Fionnhttp://archive.skyehawke.com/story.php?no=2226&chapter=1
Harry/Draco Long ago Lucius cast an Iberian spell on Harry. Can Draco break it?
The Fall by aigua nightshade ***ART***http://community.livejournal.com/reversathon/99682.html#cutid1
Fixed In A Morning Sunhttp://setissma.livejournal.com/444903.html
Ron/Draco Draco accidentally joins the OotP. Very funny if you can cope with a LOT of unfinished sentences.
May Contain Nutshttp://archive.skyehawke.com/story.php?no=12622&chapter=1
Harry/George Very sweet. George is hearbreakingly adorable at the beginning.
Under the Influencehttp://www.tittisrealm.com/thinline/archive/0/underthe.html
Stone Cold Soberhttp://www.tittisrealm.com/thinline/archive/0/stonecold.html
This duo of fics has quite few pairings (and a threesome) along the way, but it is mainly Sirius/Snape. I think SCS should have been split into two at approximately the end of Chapter 5, but it doesn't really matter. Fabula Rasa continues to stun me by making pairings I normally find squicky wonderful.SIRIUS/REMUS
Our stern alarums chang'd to merry meetings by rosemaryandruehttp://community.livejournal.com/blanketforts/135531.html
Sirius/Remus OMG - the bathroom scene! The angst! The love!
Every Farthing of the Costhttp://glassonion.populli.org/archive/1/every.shtml
Sirius/Remus It's a Buffy crossover but I don't watch Buffy and I still loved this story!
lovers alone wear sunlighthttp://community.livejournal.com/reversathon/21741.html
Sirius/Remus Sirus doesn't love Remus like THAT... does he?
A Dream before wakinghttp://littlemissgg.livejournal.com/64554.html
Sirius/Remus Remus dreams of Sirius during PoAhttp://sheafrotherdon.livejournal.com/61807.html
VERY funny crack!fic where voices are swapped in a prankSNAPE/LUPIN
Flavour of the monthhttp://www.geocities.com/howling_at_the_moon_fqf/firstwavesub/sparrowhawk.html
Funniest RL/SS I have ever read. It is completely in dialogue, and to appreciate it you really need to 'hear' SS' lines delivered in Alan Rickman's voice.
Lukewarm by Juxian Tanghttp://snapeff.quasi-evil.net/home/endfest2/archive/lukewarm.html
Remus/Snape The smell of shampoo and the sound of wanking drives Remus crazy.
Five Small Victories for Professor Remus J. Lupinhttp://magnetic-pole.livejournal.com/56435.html
Remus sleeping on the train (Art)http://www.deviantart.com/deviation/4595559/?qo=1&q=lupin&qh=boost%3Apopular+age_sigma%3A24h+age_scale%3A5
Remus kissing Severus (art)http://community.livejournal.com/lupin_snape/786658.html
Kissing Naked - definitely NWShttp://pics.livejournal.com/tripperfunster/pic/000qr6d7/HARRY/RON
Circles of Power (Auror series)http://marthas-library.livejournal.com/
Harry/Ron post-Hogwarts novel by Mad Martha, whose work is always a good read.
Harry/Ron post-Hogwarts - when Ron finds out that Harry has the hots for redheads, he gets involved. Angsty and very well written.
Coming Home (Coming Home series)http://marthas-library.livejournal.com/21375.html
Another Harry/Ron from Mad Martha. Harry comes home to England when his son, Sirius, starts at Hogwarts.
Very sensual Harry/Ron Ron wants to practice with Harry before he asks Hermione out.NOT HARRY POTTER
The Wages of Vicehttp://www.geocities.com/jat_sapphire/1nightstands/wov.htm
Hugh Davenant/Avon. Long and truly excellent.
This is a fairly long grown-up Breakfast Club fan-fic. Brain/Delinquent pairing. It really worked for me.
Short gen fic about Daniel (Stargate SG1). There is a Jack/Daniel sequel.
Outliving the Universehttp://www.yuletidetreasure.org/archive/36/outlivingthe.html
Gen fic about Susan, after the Last Battle.
Ralph meets Andrew at last (The Charioteer)
We Walk As Men by nomelonhttp://nomelon.livejournal.com/96218.html
Bill/Ted porn. First my jaw dropped, then I guffawed, then it was kind of hot...
Favourite by astolathttp://www.intimations.org/fanfic/merlin/Favorite.html
Merlin/Arthur porn. Anything by astolat is wonderful, actually.
Assumptions by wrtrs-blckhttp://wrtrs-blck.livejournal.com/898.html
Merlin/Arthur Great-Aunt Agatha visits Camelot. Hit the next button to get to the next 2 parts.
So are they all, all honourable men by serperishttp://seperis.livejournal.com/697936.html
Merlin/Arthur Merlin is driving Arthur crazy by being the perfect servant
The Gravest of Miracleshttp://rurounihime.livejournal.com/162322.html
Merlin/Arthur What is WRONG with Arthur?
Merlin/Arthur Arthur can have anything he wants.