The slave is trapped in a box with ahole for his head, he cannot turn away, he has to take with the upturned face, what Daliah will dishe out.
Lesson 1: sock-smell, completly helpless he muts inhale the fine aroma, or may be the stnky smell from the socks, fresh out from the boots.
Then he has to remove the socks with his mouth and she shoves them in his mouth... if he don't corporate she can simply use the pressure of her body weight... face trampling is so easy for her.
In the second half, she walks barefoot over the face, standing on time with one foot right in the middle of the face or another time she stands with both feet, facesqueezing again.
Some little breaks, he must now lick the toes... or What?... hehe more pressure, fullweight on your face until it's smashed.