Isabella plays with her slave the foot-smelling game. She sits on a chair and uses his face as her footstool and he has to inhale the divine odor of her feet.
He seems to enjoy this, so she decides to increase the action and steps fullweight on his chest, so he has to hold her entire weight, while she gives him another touch of the smell of her feet.
The she steps full on the face for intesifieing the pressure of smelling.