Lady Britt and Lady Isabelle have fixed the slave firmly to the wall bars and are now carrying out punishment for misconduct, disrespect of the mistresses. The two use whip and cane alternately. All the whining and complaining of the slave does not help, it only makes the mistresses more angry than the slave thinks he is in the right. He shouldn't have said that thought.
At the end of this treatment the slave will have learned which posture is the right one when he gets his ass full. Lady Britt in her beautiful leather dress repeats it many times for him: ass out, ass out, ass out. She gives emphasis to her desire for attitude with different percussion instruments and bleeds it to the slave. The correct attitude is very important after all, so that the slave likes the mistress, so that the mistress pays her attention to the slave.