TOS
Playing Chess by
UKJess (Kirk, Spock, G, 269 words)
Summary: It is five weeks into Captain James T. Kirk's tenure as captain aboard the Enterprise and he and his First Officer are playing chess in Rec. Room 3.
Notes: Short and sweet. An excellent glimpse of the beginning of a partnership.
Equal Opportunity by
Acidqueen/
syredronning (Kirk/Spock/McCoy, NC-17, 18,979 words)
Summary:Kirk, Spock and McCoy have been a threesome for some time. When one of Jim’s friends loans them a house for their Earth vacation, they find it comes equipped with a basement dungeon... which offers them the opportunity to take their relationship to entirely new levels.
Notes: This is one wonderful example of character exploration done right. If the word count doesn't scare you, you may want to check the sequel as well:
Kiss of Life Getting a Piece of the Action by
twisting_vine_x (Kirk/Spock, NC-17, ~3900 words)
Summary: The unrepentantly porny aftermath of A Piece of the Action. Warnings: Light breath play, filthy gangster talk, possessive-as-hell!Jim, bottom!Spock, hand porn, Spock getting crazy turned on by pet names.
Notes: I sometimes find it difficult to get into more explicit TOS fics, but this is OMFG HOT LIKE BURNING. The smutty coda I've always wanted for this episode.