[Mulder didn't catch all that much of it, except that Mistletoe was bad, which he wholeheartedly agrees with. But it's no use. There's a great big bunch overhead and Billy got too close.]

Oh god oh god I'm sorry about this.

[The compulsion can't be denied. He grabs Billy by the shoulders, looking pretty disgusted (nothing personal buuuut he really just isn't in to guys,) and plants a big smooch right on him.]