The Size of the Chain

McCoy wants to know what Kirk saw in Spock's mind when Spock mind-melded with Kirk at the end of "The Paradise Syndrome" — does the Vulcan feel, or doesn't he? Kirk won't tell, but he does give McCoy a rather large hint. (Although I sometimes write BDSM, there's none in this story; the "chain" in the title has nothing to do with kinky sex. :-D)