Her nipples must be extremely sensitive. She genuinely looks and sounds like she feels legitimate, severe pain. She doesn’t really even moan, never mind scream, or what have you. She doesn’t vocalize much at all. She just sits there and breaths heavily, almost sounds like she might be on the verge of crying at one point, and literally shudders both times after removing the clip. That’s a true masochist: I become turned off by seeing someone in that amount of pain normally and feel horrible for them. That’s what makes it so hot to watch her do that to herself.