Possibly a dead fic, but an interesting premise and decently written:
http://www.fanfiction.net/s/5316196/1/Loyalty (Naruto)
Sakura gets coerced into working for Kabuto pre-series.
Aaron Nowack
http://www.fanfiction.net/s/5316196/1/Loyalty (Naruto)
Sakura gets coerced into working for Kabuto pre-series.
Aaron Nowack