When Svenja decides she can't trust a slave, she ties him down. She doesn't care about his needs, she wants him where she can see him. When she is ready to punish him for her lack of trust, she strips down to her lingerie and slaps him. She gradually increases her slaps until he is experiencing face numbing blows from her. She enjoys his pain and lack of understanding as she slaps him harder.
There is nothing like calling a team of professional slappers in to punish a slave. After a slave was caught trying to run away, Sibilla and Emily were called in. they arrived in black leather and they immediately too him under their control. They put him on his knees, tying him up. Then they started to brutally slap him. Each blow was bruising and landed harder than he expected it to. He learned to stay where he was told.