When I found out ballbusting exists and that I liked it.
I'll share my first experiences getting busted as a man. I started dating this girl, she was 5'3 about 130lb, thick but fit build. She loved to play wrestle and play fight each other right off the bat as we started dating. I though it was fun and it would usually turn into something sexual so I was into it. we were both youngish (late teens 18+)
After a few weeks or so of dating i noticed she'd start to knock jokes about how she could actually kick my ass in wrestling if she actually tried and would "fake" balltap me randomly. She then slowly started using ball taps and little kicks and knees to get out of positions i had her stuck in. That continued for a while and I started to enjoyed the challenge of her taking advantage of my balls in order to even the odds. After a while she started noticing that I would leave myself in venerable positions to make nut shots easier for her and that I would start getting really hard the more she aimed for the nuts.
Eventually it became her primary focus, she would grab, squeeze, knee, punch and kick me from behind while i was down etc and I learned to love every second of it. It eventually turned into a game where if I lost a match she would get to start with a "cheap shot" or with my hands tied behind my back and the entire match would just be her focusing on different ways to hit me in the balls while i rolled around on the ground in pain while also teasing me and keeping me hard but not allowing me to cum.
We were young so we never go fully into the scene that involved restraints and everything else that exists in the BDSM/CBT world. Sadly we parted ways many years ago due to a number of reasons, I still dream/daydream of the types of stuff we used to do to this day.
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Edit: If anyone wants to roleplay some scenarios for fun please DM me, I need some new ideas to dream about!