when i started to do ballbusting, my varicocele was not so big. I noticed sometimes after very long sessions an increasing of scrotum volume, and that's was due to the increasing of the varicocele size.
The left testicles also was bigger cause a little hydrocele formation, so one time I used needle play to drain off the fluid in excess. That thing excited me a lot!!
Now my left testicle and scrotum is increasing again session after session, i'm excited to the idea of have bigger balls caused by violent ballbusting