A True story answering your question, it's long but relevent please read
Let me tell you a short story, a real story actually, something that happened to me a long time ago, it goes a little something like this: Almost 2 years ago i was meeting this girl, i use to meet her for ballbusting and sex, actually the first time i had sex with her i introduced her to ballbusting, at first it didn't get anything out of her but boy was I in for a treat, after a few sessions with her she began liking it, she said to me once that when she busts my balls or squeezes them it makes her feel powerful, and she likes the dominating part on her end, and so did i like it, actually the moments spend in her company were probably the best moments in my life, and i'm not just saying that... kindred spirits me and her. My usual meetings with her began with squeezing, slapping on my balls and alternetively she would go down on me but of course she wouldn't loosen her grip on my balls while doing that :jumpsmile afer 10 or 15 minutes of that i would put my balls up on my abdomen just over my balls and she would step on them, well i wouldn't let her do it fullweight back then because i wasn't use to having the same stamina i have now and she was a bit overweight so i passed on fullweight ballstomping. After that we would get down from the bed and she would kick me until i fell down a couple of times sometimes, she would kick me hard a couple of times and i would go down screaming clutching the bed like somehow the bed would calm my pain down, but of course it didn't then i would remain on my knees and she would kick me while i'm on my knees, when i have truly had enough kicks we would get up and go back to the bed and have wonderfull sex... like there was a battle of the sexes and the prettier sex just won and to celebrate her victory she would hump my brains out ;)
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So this was usual, but after a few months of meeting her once or twice a week i cut down on watching any kind of ballbusting vids, and i began being more horny, so once just before we started i told her: this time i want to do it diffrently: this time when you squeeze me you can squeeze me as much as you want and even if i ask you to stop you don't really have to do it, unless you really want to ( no safeword ) so she said yes and we got to it: she began going down on me while squeezing my balls, then she would stop that and she would just squeeze them with a tight grip, at first it wasn't that bad, but after a few minutes it began being frustrating so i asked her to stop, i said:" please stop !" but she wouldn't she kept going, then again i would ask her "please stop !" but she wouldn't after i while i would tell her: " please stop i can't take it anymore... !!" and she would reply: " no !" "i will keep you as long as i want !" and then i got scared and i told her desperately: " please !!! You are braking them... !" and she would say: "I'll brake them ! They're not mine !" and i was in complete agony, then after a while she would let me go she went down on me some more, then she would leave me unsqueezed for like a minute, then she would squeeze me again, then i would tell her to stop and she wouldn't, then at some point i would plead with her: "please stop...! " please... !" and then she said something to that really shocked me and i think i will never forget she said: " bark like a dog !!" then i said: " woof !" then she began laughing at me, and said: "do it again !!" and i told her angry: "no ! I am not an animal!!" then she let me go. and we kept doing it like that for like 25 or 30 minutes, during witch i thought of braking her grip on my balls but i was too weak because of the pain, see i was in a really pathetic situation, i truly have felt like a slave, for real this time.
And to answer your question, i almost cried ! I had tears in my eyes, and she saw me... she looked at me and made a mocking face and said: "Awww" and she continued squeezing me like she dosen't care !
Next time i met her i was angry with her and i told her: "I want to tell you something ! She then asked: "what" ? And then i told her: "You went too far last time... ! It hurt too bad !" she then was a little bit scared and mad at the same time and replied: "It was you that wanted it ! and then i told her: " Yes but you went too far i don't like it like that." She seemed to be sorry, a nother time she told me she dosen't want to hurt me, that she dosen't want anything to happen to me.
See the stange thing is: allthough it was a shocking experience i still let her squeeze me as long as she wants even after that, even if i feel the need to cry she hears it and dosen't stop, i meet her like 40 times after that but we never did it that hard again.
So to answer your question, i like it... i like being pushed beyond my limits but not as much as the point where i don't enjoy it anymore and it becomes traumatising. I FUCKING LOVE THIS SHIT ! AND THIS IS TRUE SADISM ! But... be carefull what you wish for my friends because it myght just ruin you... :(