I've got a few Mistletoe fics! Both Kirk/Spock. (Also I hope you don't mind a self-rec? It matches what you're looking for :))
1) Mission:Mistletoe (http://notboldly.livejournal.com/19048.html) by notboldly | Summary: Despite his best attempts to avoid it, Spock keeps getting caught under the mistletoe.
2) Five Times Jim Used Mistletoe and Failed and the One Time Spock Turned It On Him (http://archiveofourown.org/works/374416) by uh, me, marlee813 | Summary: Kirk chases Spock around the Enterprise, mistletoe in hand, while Spock uses every trick in he can to evade Kirk. Kirk is sly though and eventually corners his prey. Or does he?
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Date: 2012-12-24 10:13 pm (UTC)1) Mission:Mistletoe (http://notboldly.livejournal.com/19048.html) by
2) Five Times Jim Used Mistletoe and Failed and the One Time Spock Turned It On Him (http://archiveofourown.org/works/374416) by uh, me,
Happy holidays!