The Carrot and the Stick by Plausible Deniability (NC-17)

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Fandom: THE X-FILES
Pairing: Mulder/Scully
Author on LJ: Unknown
Author Website: Fanfiction by Plausible Deniability
Why this must be read:

While humour is a vital element in the XF universe, it can be difficult to master without resorting to farce and is a skill to be much admired. Even more enviable is the ability to write incredibly hot smut that is both true to the characters and also very funny. Plausible Deniability manages to do just that, endowing this Mulder with a sweetness that is endearing and leaves you wanting more. Fortunately for us, there's a sequel.

For the past few days, I keep catching her looking at me with this strange expression on her face, as if she's just about to break into a smile, but thinks better of it at the last second.

The Carrot and the Stick.