I really like couples. A nice one-shot doujin is fine and dandy, but doujins with established characters are so much juicier, so much more filling.
Unfortunately, people rarely bother to fill out the descriptions in Fakku's database, so when you're looking for a specific couple, it gets frustrating, you have to read some or all of a doujin to get the gist of what's going on.
This thread is supposed to alleviate the problem, at least until Fakku adopts a tagging system.
Evangelion
Shinji Harem
“Mio”
Shinji tries to enjoy a nice steamy little exchange with Rei but gets interrupted, really good art
“You Can (Not) Refuse”
Stereotypical EVA harem stuff with amusing Kaji yaoi tease at the end, fun stuff
Shinji & Asuka
“Ecchina Cosplay Asuka”
Shinji and Asuka work out relationship troubles through a day of erotic cosplay (look for famous cosplay cameos!)
“Nerv's Longest Day”
COMPLETE screwball doujin with some of the funniest shit I've ever read
“Poyopacho Z”
Asuka overhears Shinji having sex and gets jealous
(a follow-up to this Shinji/Mari doujin)
“Plug in Baby”
Standard tsundere fare, featured on Fakku's front page recently, I don't quite like the art
“Confusion Level A Vol. 3”
Nice art, I think this one counts as a Re-Build 2.0 spoiler, CONSIDER YOURSELF WARNED
Shinji & Rei
“Love Rei X Shinji”
Very, very affectionate doujin
“White Lie”
Shinji awakes from an angel battle with amnesia, everyone takes advantage of him, most especially Rei~ --- Hands down the BEST art I've EVER seen in an EVA doujin, the style compliments EVA character designs perfectly
The Melancholy of Haruhi Suzumiya
Kyon & Nagato
“Nagato Yuki no Inchou”
Typical ice queen Nagato shenanagans. Nice doujin because the art style is a departure and THEY AREN'T IN THEIR FUCKING SCHOOL UNIFORMS, THANK GOOOOOD
“Me and Nagato”
Nagato must somehow protect the world by having sex with Kyon to satisfy his lusts, why is this the premise of so many Nagato doujins? Also violent.
“D.L.action 36”
Ice queen Nagato melting, no, evaporating.
I hope somebody translates the two sequels to this because I think it is insanely hot, no joke [size=5]highres only, final destination[/h]
Kyon & Haruhi
“Nanika Kawara de Hirotta”
Mikuru harassment, Haruhi relents to sex with Kyon, nothing new.
!!Horrible translation!!
“Revelation H”
Really tsundere. “Revelations A through G were a complete failure, but we now have a working tractor beam...”
“Haruhi's Ache”
Haruhi catches Kyon and Mikuru in the act, guess what happens
Genderswap Stuff (my fav)
“Haru na no ni Sukumizu de Iin Desu ka”
Haruki drives a loli-Kyonko to tears with his teasing
“KYO-N wa Kanojo na no ka”
Male Yuuki (forget his name) drives Kyonko to mind-numbing orgasm with a different kind of teasing