"Consider yourself human furniture in this position. Here, your back would either be used as a footrest or a seat."
"A slave could possibly spend hours as a footstool. Having a Goddess' feet propped up onto your back is a profound privilege, so be honoured. Here, other slaves can be ordered to worship and clean her boots and feet- tasks that you will soon be accustomed to."
"Pray your underdeveloped mind can handle these menial tasks, for failure to execute these positions properly would most certainly result in punishment."