She steps on his exposed nuts with her high heels, squeeze them with her shoes and slap them as well, until it gets very painful for him. But she got an even better idea on her ball torture day. She ties them up and pull them high in the air, so they are even more vulnerable and exposed to her sadistic needs. This ball torture got real extreme when she kick his bollocks merciless, many times. It must be extreme painful for a man to get such endless, ruthless kicks in his tied up manhood.