"Do they arouse you? I hope so."
"Now edge for my breasts! Imagine how I bury your cock between them!"
"Good, hands off of your cock! Take the shoelaces and wrap one around the base of your cock, the other one around your balls! Make it very tight."
<< If you start to lose feeling or your genitals turn another color (blue or something) untie them! I don't want to get sued if they fall off. ;) >>
"Slap your balls 20 times, slave! I want them to hurt!"
"Now start massaging them and while you do so stroke your cock 50 times slowly!"
"Now slap your balls again slave! Do it 10 times and stroke your penis for 2 seconds after each hit!"
"Well my slave does it hurt? But it feels good nevertheless, right? Well you may go on now."