This woman has been punishing a submissive man by locking him in bondage on the bed and giving him a spanking.
That mirror tells a story. She is a sadist. She enjoys spanking and discipline men so much she wants to see as much of her own performance as she can.
Any submissive man who wants to spend time with her must understand this. She will spank and hurt him just for fun. He does not have to offend her or merit a beating. She whips him just because of the excitement and energy.