So I bought a new toy, on request of a zity member a few weeks ago. ( nippl screws)
Today I used them for the second time only, I had expected them to hurt but they don't really, it just gives a wonderful tugging sensation.
After removing the screws I noticed I even started lactating!!!!
My nipples are sensitive afterwards but not unpleasantly so.
I think the apprehension I felt by the description has evaporated and I do enjoy them greatly.
( photos in my album)