Waiting for the pain
The slave can't do anything just wait for the pain to kick in, simultaneously with Mistress Ariel's brutal boots. And when her boots finally make contact with his groin, he doubles over and moans very painfully. And it makes Mistress Ariel extremely happy. So happy, she doesn't want to stop this cruel punishment. She kicks his balls over and over, until he is on the floor, crawling after her legs.