Rule number one: you don't moan. I need to relax a bit after this long stressful day, and what I don't want to hear is your pathetic voice. Rule number two: don't you dare shout for some trampled testicle. I want to test new stuff! Also, I've read an article about man's balls and how delicate they are and... Well... how everything works! They say that when you cum, sperm is ejected at high speed and the cock can hold all that pressure. I wonder what will happen if I'll close that little duct you have. How much pressure can it hold? How much will it hurt? Your poor balls are going to feel something new and painful today...