I stayed up way too late last night to read Deny Nothing, and it was terrific fun. I only watched XF sporadically, and I don't remember if I ever saw any Krycek episodes, but I got the distinct impression that you must have had a blast writing his POV, especially in the early odd couple/"buddy cop" sections.

You ask at the end of the story: "let me know whether you think M&S were doing the nasty."

I could go either way, but I'm going to say no based vaguely on the scene in the van after the rescue. Unless Alex was wrong and they did have sex while he was watching Mulder's apartment -- but I don't think that Scully would have left in that instance.

Now I'm wondering whether you'll leave the question open in the sequel or resolve it. Either way, I'll look forward to it!