And you're right -- I'd rather start a little less agressively in this case, if possible. She likes the idea, but ....

Might wish to try some small plastic clips. They are like clothespins but not as strong of a spring. You can buy them on-line through adult toy stores or go to Wal-Mart and get the bright plastic ones. They are in a variety of size and types. You can try them out on yourself right there in the store to see what the pressure would be (No...don't life your shirt and put them on one of your nipples...besides getting kicked out of Wal-Mart I find alot of men have a higher tolerance for nipple clamps then some women). Clip one on the skin between the thumb and forfinger. That is a good gauge of sonsitivity.
My subbie has very sensitive nipples and while we have a large array of clips and clamps, most we don't use much, or if we do only for a short period of time. What I have found more satisfying for us, is to apply pressure with my hand, slowly building it up, also twisting and occassionally flicking my finger at her nipple. This gives her small bursts of pressure without the long time effect of a clamp. Also, the longer you have the clamps on the less effect....till you take them off.
Have fun.


SirW