That's it, slave. I'm sure you're pretty scared about what I'm going to tell you to do, but there's no need to be. It can't be anything worse than what Captain Kross has put you through, after all.
Grab an ice cube, and throw it to the other side of the room. I don't care where it lands, if you're any good it won't have time to melt much anyway. The catch, of course, is that you have to walk there to pick it up with that weight dangling from your balls.
Once you pick it up, shove it up your butt. Only once it is fully in you may you lessen the burden of the weight on your balls. Keep the rope tied however.