This mistress felt that this guy had some bad behaviors that needed to be stopped. The mistress knew that there was no better time for the guy to stop them than today and that is why she forced him to do it. But since he was not willing to stop them on his own, she had to make him do it. She did this by forcing him to endure nipple torture and she threatened ball torture too.
Mistress Nica had an issue with her ex that they had not managed to sort out. He was the stumbling block towards the resolution of the issue and as he continued messing around, she had to punish him and she did so using her nipple torture femdom. He was in pain as she did her thing on him and that is how he learned never to be in the way of resolution of a problem.