The sound of a suffering whimpering slave always brings a smile to Goddess Katrinas face. Its both because she loves to see him in pain, but also because it pleases her to know that he is willing to sacrifice his comfort and offer her his pain in tribute to her as his goddess. Thats partly why she lets this slave worship one of her pairs of shoes while she whips him, to reward him for his offering of pain but also conveniently because that particular pair of shoes needed cleaning anyway.