Quote Originally Posted by orchidsoul
But how does even the dominant prevent themselves from inadvertantly crossing that line? Obviously in a healthy relationship as you describe above one does not expect any of this to happen, but could it regardless?
By having a relationship which includes a lot of discussion both in and out of a scene. This comes back to the relationship being 'healthy' but discussion (and acting on that discussion) is essential to ensure that the submissive is encouraged/led/taught to be changed in the 'right' way for that relationship.

If this doesn't happen then surely the submissive is trusting to luck.