For me the most important aspect of ballbusting is a sexy female, followed by a nude male. I prefer the female to be naked, but strip ballbusting is also fun. It can be used as a reward or punishment for the slave, he gets to see his mistress naked but has to pay a price for it.
Bikini ballbusting and lingerie/underwear ballbusting are probably my favorite, I like the CFNM aspect to it, and the casual nature, as if the mistress is just relaxing at home and does stuff like this all the time.
I love outdoor ballbusting, and what I would also like to see is faux castration videos, with the slave’s cock and balls being threatened with a knife or burdizzo.
Barefoot ballbusting is my favorite, and I’d also like to see more knees and punches to the balls. And of course, seeing Stacy busts balls with another mistress or two would be amazing. Let me know what you think Stacy!