Nailing his balls and ruining his orgasm

Description: We have this slave willing to do anything for us. we're going to use him with a wooden board he doesn't expect. we insert our cock and balls inside and pull them out. we use a hammer and nails to hammer away at unexpected places, while we vibrate his cock to give him erections. finally, we face-sit him, and he cums without being able to touch himself, completely tied up.