Slaves are accepted for training and all types of body modification, male genital removal and modification. A master at body changes - and always in a scene with an experience Master. His female slave can assist also. Can make a wonderful pony girl or boy out of a slave. Nothing is to extreme - as long as you are left in good health.
Permanent damage is a matter of opinion.
If you hate your balls or cock, leave it with me, or you can have them for dinner. Start with a refreshing enema, or pee shower, and move on to an exciting ball crushing. Get on your knees and grovel.