I bought this cat o' nine tails at Spencer's Gifts a few years ago, thing is great. The tails or made out of a very soft leather, almost like swede. Swing as hard as you can and it stings a little, not enough to leave a mark. It's more of a fantasy play toy which is fine with me.
I've used wooden clothes pins on the toes already. It's a bit uncomfortable but not painful if done carefully. Throw on a pair of nylons, clip the clothes pins to the nylon between each toe and tickle away. When the toes curl, the clothes pins pinch. She doesnt know what to do. That's some fun torment.