I experienced a rather intense stimulation technique that could go along well with ball busting. A while back, my wife stimulated my head at the end of intercourse rather intensely, which was pretty intense to take. I used to feel this really intense feeling if I kept on stimulating myself after ejaculating when I masturbated when I was younger, but when I trained myself to take stimulation and keep on going, that exquisite overstimulation feeling diminished and wasn't quite as intense.
I remembered that if my wife was giving me a handjob, and she did a certain technique to me, it was too intense after a few seconds. This technique is to rub the head of the penis only, without rubbing that underside that feels so good and kind of 'balances' things off.
So, I asked my wife to give me a hand job only rubbing my head. I told her to have no mercy and to keep on rubbing, and to keep on rubbing the very same way after I orgasmed for a while. She did a kind of technique where she acted like she was opening a doorknob. Man, was it intense. I was wiggling and squirming. When I ejaculated, though, she was too concerned about not getting mess anywhere and didn't keep on going like I had wanted, and my mood had changed half way through ejaculation, and I had desire to persuade her to keep going. I sure wish my wife just wanted to keep going and to 'torture' me after ejaculation by doing this. Maybe if I were pointed down and ejaculated into a bucket or something instead of it dripping down on the head, that would change things.
Even so, the experience was so hot, I kept thinking about it, walking around with an erection much of the time for the two days that followed. the stimulation kind of got the head of my penis worked up and I was 'head horny' for a few days. (Ever been 'ball horny' for getting your balls busted? Well, I was head horny, wanting to get my apply polished again.)
Anyway, this polishing the head torture, as I found out it was called, can be excruciatingly overstimulating. I think it could go well with bb, maybe as a punishment for using a safeword, or bb could be the punishment for using a safeword while getting one's head polished.
One downside to this was I had her try it a night or two later when we got the chance, and it wasn't nearly as excruciating. I didn't even thrash about.