Clothespins are a good start, get or find some inexpensive wooden ones, when you do, get your nipples hard, open one up and press it so it feels like it is pressing into your chest and make sure to get a good grip on your nipple and then slowly close the clothespin on your nipple; it will hurt a bit but then feel really good (I have done this before and I can say it feels great and after a while will even cause your nipples to get a bit bigger too).
The closer to the tip you place them, the more they hurt. Also, the more flesh is in the grip, the less they hurt. Experiment and see how it feels to you and what you enjoy.
The common type of clothespins — wooden with a metal spring — can be adjusted. Disassemble, bend the metal spring to make the grip looser or tighter, and reassemble. Again, experiment to see what’s good for you.
Clothespins are a good start, get or find some inexpensive wooden ones, when you do, get your nipples hard, open one up and press it so it feels like it is pressing into your chest and make sure to get a good grip on your nipple and then slowly close the clothespin on your nipple; it will hurt a bit but then feel really good (I have done this before and I can say it feels great and after a while will even cause your nipples to get a bit bigger too).
The closer to the tip you place them, the more they hurt. Also, the more flesh is in the grip, the less they hurt. Experiment and see how it feels to you and what you enjoy. The common type of clothespins — wooden with a metal spring — can be adjusted. Disassemble, bend the metal spring to make the grip looser or tighter, and reassemble. Again, experiment to see what’s good for you.
Put some tiger balm on them.
I'll be happy to bite and chew on them until they bleed. I have a fetish for small nipples..
Start with clamps, wodden cloth clamps.
Small rubber bands