Slothy, FS is not commonly available in Montreal area MP's, especially those on the Island of Montreal itself. Most MP's on the Island are strictly rub'n'tug.
However, there are several well-known incalls in apartments or motels (ZZ Cream, ABC Soft, Le Rendezvous de la Rive Sud, etc.) that have been reviewed extensively on MERB. There are many indies who advertise in the Journal de Montreal. Look in the classifieds in Section 340. I'm bilingual, but if your French isn't that good, the key word is "recoit". It means she "receives", i.e. it's an incall. There's also a free English language weekly called "The Mirror", very much like Uptown that has lots of adult ads.
I've PM'd some info on outcall escorts too.