I will acknowledge I have seen this, but more common is a slave and a moderate switch submissive - where the sub will go along with a lot - but not being tortured - at least not that severely. It appears to me, the one being kicked acts very much owned, not sure about the other. The reality at the end of the blind dragging her around and easy ordering suggest a sense of absolute certainty that her actions will be met with obedience and acceptance.
not sure the girl doing the kicking would have been happy to go along. The girl getting kicked - well seems like she doesn't care to be anything but owned.
the thing is - that you know that she would have just taken a bunch on the other side too- just to even it out. Course not like they would have felt bad about doing it either. Get the feeling that they are used to ordering her around, and comfortable she will just take whatever they dish.
Love "I'm sorry" cause it is so clear she is not really. She was just bragging seconds earlier- and kicked it once more for good measure. Course he is laughing his ass off too - so well. The fact that she just dragged her and orders her around speaks volumes too.