There's a Kagome-Genderbender story where she has to cross-dress if that counts. Sadly it hasn't been updated for a couple of months. Just in case, though:
Crazy Paradise by QuietSerenade
Kagome, a skilled fighter and crime-hating girl, suddenly finds herself knee-deep in debt to the Yakuza. In order to pay it off, she is forced to act as a bodyguard for Sesshoumaru, the head of the top yakuza clan. The catch: Nobody knows she's a girl. Based loosely off of Tokyo Crazy Paradise.
Rating: T - Universe: Alternate - Status: Incomplete - Category: Chapter Stories - Genre: Action, Humor, Romance - Updated: 01-24-10 - Created: 01-21-10 Chapters: 5 - Reviews: 20 - Words: 26,835 - Reads: 3,570
Edit: I feel sort of stupid now, xD. The roles aren't really switched, but it's an excellent story all the same :| (You could say it is if you've read Sess!Bodyguard stories, b/c Kags is the bodyguard here)