I'm no Professional Domme.  But I do know enough about breath play to know how it was shown in Affliction was WRONG.

Last time I checked it is used for the pleasure of the Sub...you know the person being choked?  The scene as I remember it focused very little on Anita's pleasure and almost entirely on Nicky's pleasure. 

Nicky is a psychopath and a sadist.  An ARC of Dead Ice is out there...and Nicky gets even worse if possible.