I have very sensitive nipples too, and have taken stimulation to a high art. One of the best and most basic things I like is to tie them tightly with dental floss. Waxed dental floss is best, since it stays tight after you make the first knot, so that when you double-knot it, it gets very tight. Use a pair of high-quality wire cutters to remove the floss.
After you’ve tied a tight choke-hold around your nipples, they will plump up very nicely, almost painfully. It takes a little practice to get good tight ties. You can’t release them without tools of some sort, so you can do nice nipple bondage.
1. Tie a string to each nipple, leaving a long length hanging from each. Then tie the other end of the floss to each ankle. If you make the length short, in a sitting position, this is very disabling, and can be very exciting (ie: painful) crawling to where your cutters are…
2. Tie a weight to each nipple. I like doing this with a considerable weight (a full bottle of water for instance), leaving enough length so that the weight can lay on the ground. Then put on a pair of handcuffs, with the key somewhere far away, and you’ll have to drag the weight to get release.
3. Well, you get the idea. Endless hours of fun here!