In Y. S. McCool's Perfect Agent
http://www.squidge.org/~flashpoint/ts_au/agent1.html(you'll need to get the password), Jim turns down an assignment from his old controller, who then kidnaps Blair, and turns him into a Covert Ops Agent. Be warned, when he's Agent 5752, Blair is not a nice person. There are many warnings for this story. To quote Y. S. McCool :
"Warnings: violence, angst, betrayal, B&D, S&M, water sports (and I don't mean water polo), hints of non-consensual intercourse, and gunplay. If you go on to read this story, then you can't complain that you weren't warned about the contents."
What I'm hoping you can give me is other stories where Blair is a Covert Ops Agent/ a spy/ just thinks he's a spy for some reason or another. He could work alone, or with someone else. Anything goes, but if it needs as many warnings as Perfect Agent did, please bring it to my attention, so I can save it for when the mood is right. Also, it would be nice to know if the story was slash, gen, or het.
Many thanks.
Roz