Nakatsu by Lazuli
Nakatsu-centric for me. <3

Snapshots by exwaiz [Nakatsu/Kayashima]
Ha ha, bet you weren't expecting that, were you?! XD I didn't think I would ever actually find any of this, but aishuu rec'd it on rec_a_day, and I was enamoured. It's rather tidy, and fits in at the near-end of the manga. (Spoilers!! Like mad!) I could see it being a bit longer, but really it works very well just as it is.

Kayashima/Nakatsu by Becky [Er... Kayashima/Nakatsu PWP. Untitled, so I titled it with the pairing.]
So Becky was doing a drabble!pron request thing and, hell, who am I to resist such excellent goodness? No one, that's who! So I refused to resist and begged for some Kayashima/Nakatsu and...oh...sweet. This was -exactly- what I was looking for. It's perfect, it's sharp, it's Kayashima to a T and Nakatsu is orientation-confused and so -classic-. I died of happiness, and hopefully you will, too!

Nakatsu, Upside-Down by Yuletide [Nakatsu/Kayashima]
"Your aura is weirdly purple," Kayashima's voice floated down from the upper bunk.

"Eh," Nakatsu said. "Maybe I'm weirdly purple today." He gave himself a thumbs-up and left with a wave of silent thanks for Kayashima's concern.

Akiha/Umeda

Series by NinjaTrauma.
Akiha/Umeda, snark snark snark! Deliciously canon goofing around and snarking and love. [There's more, scan her journal/memories]

 Anti-Disruptive by Vikki [Akiha/Umeda]
It's just a short drabble, and I don't normally read this pairing but...lovely. Just lovely.

Flowers by NinjaTrauma
Actually, there's a second fic here, too, two short drabbles. The second is called 'Jealousy'.  Both are Akiha/Umeda (her OTP).  Very smooth and snarky and with just that amount of distruption you expect from something centering on Umeda-sensei. ^^

Cats & Dogs (1 of 2) by Becky [Akiha/Umeda]
This just made me desperately miss my cat. I mean, here I am laughing and grinning and poking at the subtle little layers of it, and then all I could think was, "Life would be so much better if I had a cat curled up next to me right now". ;_;