Princess Serena has a thing for slave humiliation. Anytime she feels like humiliating a slave, she will always use her sneakers to do it. She loves using sneakers because she is able to achieve her objective comfortably. The sneakers are comfortable but they can deliver devastating pain to her slave if she wants to use them to punish or humiliate the slave. She can also use them to degrade him by requiring him to lick the dirty soles.