Never let it be said that I do not delivarrrrrrr.
TOS fics marked as such. Otherwise it's reboot slash. And, as is standard, a ♥ = MOAR LOVE FOR THIS FIC THAN I SHOULD HAVE THE POTENTIAL FOR FEELING
Also, have some links to important K/S hubs:

Kink meme and Kink meme 2.0
K/S Archive
kirkspock
newtrekslash
st_ficfinder
startrek_rps
tarsus_iv_fic
Killa's K/S fics The K/S author who is all but revered ( Read more... )