The following story has been sleeping in my desk drawer for quite some time now. I wrote it back in - what was it? 1994? when I first discovered K/S slash in zine format. It never got finished, and it never got translated into English. Still, I like it enough that I believe it deserves to be read, even if it's only the first part of a longer storyline:

Der Weg in der Dunkelheit - #1: Opfer und Opfer
Author: allaire mikháil
Fandom: Star Trek: The Original Series
Pairing: James T. Kirk / Spock
Rating: NC-17 (for adult themes)
Summary: Als sein bester Freund aus romulanischer Gefangenschaft zurückkehrt, versucht Spock verzweifelt, die mentalen und emotionalen Wunden von James T. Kirk zu heilen. Aber Jim tut etwas Unverzeihliches...
2.299 words, drama, Kirk POV.

How to get Kirk and Spock into bed together in a believable way? With Spock still being all Vulcan about it?

I believe the style works extremely well - another reason why translating this story into English never progressed very far.