Here is a lovely fic I strongly suggest you to read.
Title:
A moment on Tarsus IVAuthor:
2thehiltRating: K+
Pairings: none
Summary: The anniversary of the Tarsus IV Massacre rolls around. Kirk tries to forget what day it is, Spock and McCoy refuse to. Discoveries are made that give us a glimpse of the past that helped shape James T. Kirk into the man he is.
Reccer's note: This is a precious and original take of what happened before and after and because of Tarsus IV. Very well written and perfectly in character.