Close To Bone, NC-17
http://www.kekkai.org/synecdochic/sg1/close_to_bone.html

This story is dark and twisted in all the best of ways. it's
D/mini!me, but that's not more than one paragraph and not really a
huge part of the story. In some ways Mini!Me feels *more* real, more
Jack because he is what Jack would be with out the social constraints,
he's pure!jack.

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from the fic:

"The old man picked him," JD corrects. Which threatens to send
Daniel's mind off on the age-old question about what makes up
identity, whether JD and Jack were the same person, then or now, and
if what one of them did, the other's responsible for -- but now's not
the time, and JD's face makes that clear. "I need you to get me some
information I can't get."

Something about JD's body language hits the spot of Daniel's psyche
that will always roll over the minute Jack issues an order. It's a
spot not even Jack can reliably find anymore.