Cruel Reell loves it when she gets to feel the balls crush under her feet and that's why she's kicking this slave's balls in her nylons while he stands. He's already doubled over in pain because she's trampled them in her boots so they're pretty much mush, anyway. Now it's time to finish the job, so she winds up and kicks them with her almost bare feet over and over.
Miss May and Lady Jolie Berrie have a pathetic slave on a BDSM cross outside where people can see him to humiliate him while they torture him. They grab him by the face to scream at him and make sure that he understands he's nothing before winding up and kicking him with all their strength right in his balls. It's a good thing he has no use for them at all.