Call me a pervert all you want, but watching nipples get tortured is really where it's at. It's like the cumshot-for nips.
www.pornstarcompendium.com/model/velicity-von.html
Velicity Von demonstrates:
If you want pics like these,
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PassionUK
http://www.stocking-divas.com/stocking-galleries/PassionUK/passion66stockingtease.html
go to Nipple Chains
http://board.freeones.com/showthread.php?185815-Nipple-Chains/page75&highlight=nipple chains