Everyone is different. Some people can handle more pain than others. The ability to take more pain over time can be learnt. It all takes time, practice and patience. My slave wants to experience ball busting. I start by teasing his cock and balls with the leather on My boot. Exciting him. I knee him over and over again. Slowly, letting him enjoy the sensation coursing through his body. I then grab his balls and pull them down, I want them warmed up, ready for Me. Busting his delicate little plums!
Finally I pull off My boots. I want him to feel My feet as they make contact with his balls. Shivering and shaking he loves it. he wants more, but he will have to wait until next time.