Nikki is trying to produce as many ballbusting clips as possible with her slave to maximize her profit. The more ballbusting videos she makes, the more money she makes. She doesn’t care how exhausted or injured the slave ends up. He is only there so that she can turn a profit from the clip sales. The slave is very exhausted from the relentless ball kicking. Nikki does not care. She is just getting started and has many more to produce. Nikki completely annihilates the slave’s balls, then makes him bow down and kiss her boots. He begs Nikki to stop, but she has a lot more videos to make, so he better just learn to hang in there.
