The common office stapler is not the most appropriate device to bind zippers to Tanita's tits and pussy but at least it is the most evil method to do that. What is the difference between a staple gun and an office stapler? The last one drives the staple through the skin and into an anvil, a small metal plate that bends the ends inward, so the pain is much more intense than in the case of using a staple gun that has no anvil. Tanita just loved it!
Clothespins may not appear some crazy painful torment devices, combined with whipping was enough to freak out Jade in the middle of the shooting, so Queensnake had to take her place to finish the scene. Even she could not handle it well enough mentally, as you can see in the last few seconds of the movie.
In this scene Nazryana had to pretend she enjoys her pussy being sewn together. Unbelievably, after the initial pain shock (and an off scene warm up orgasm) she got all wet and excited, and really started to enjoy the process, finishing the shooting with a decent orgasm.