I've been doing some brain storming on this issue for something to threaten my slave about. So far the worst thing I can come up with is grinding up Habanero peppers and using it as a vaginal lubricant. I'm not all that sure if this would even be safe, and I know from experience that when I got some under my finger nails that it continued to burn for three days. This would suck for me later down the road when I want to have sex with her because of how hard that stuff is to wash out. I don't want to do any permanent damage to her, please leave your suggestions for better options.