I love CBT myself and a few of my favorite methods are the following:
Pulling weight on balls
Tie a piece of string around your balls. If you have a cock/ball strap even better, but make sure to put it
only around your balls and not your penis.
Then get a water bottle with a loop to which you can tie the string (or a string from the cock strap. Fill the bottle with water. This is a great way since you can experiment with the weight by how much water you put in (and the size of the bottle.
Stand like that with the bottle dangling from your balls.
Crushing weight on balls
Place your balls, and
only your balls, on a flat surface. Use books on a desk to adjust the height so that you can easily place them while standing. To make sure they don't slip and to add to the torture, you can also tie a string and pull them by tying the other end across from you (not allowed here, but I can PM you a picture how I did it).
Then, start placing books on them. Add as many books as you can handle, further crushing your balls.
Piercing penis torture
This method focuses on the penis only but is probably the most diabolical.
Get an empty toilet paper roll and cut it open over the length of it. Place tacks through the roll so that they come out on the inside. Do this over the entire surface of the roll. Now wrap duct tape around it to keep the tacks in place.
Now, wrap the roll around your flaccid penis and keep it in place using two rubber bands on either end (they don't have to be too tight.
Depending on your size you will already feel the piercing but of course, now we want to get you really aroused so watch some porn or do whatever is needed to get you aroused. Enjoy your torture!
