Found a new fic that seems to fit the bill of your request - Mort's new 'Ball and Chain'. It takes awhile to get to the actual M/K part of the story, but when it does - Mulder rules in the bedroom.
Rather hot!
http://morts-lair.com/XFfanfiction/MulderKrycekSlash/BallAndChain.htm
Nikita
www.koukla.net/nikita_slash