It's true: my nipples are just as sensitive, if not more so than my clit, so it's like having two large clits sitting on my chest. They're pointy and long when aroused, and I love making them even bigger by placing suction cups over them. Those things can get them up to 3 times their original size - wow! It feels absolutely amazing to have them squeezed, flicked or teased, so I use a number of props to please them. Usually I clip two clothes-pins above and below each other on each areola so that my nipples stick out forward. Then I place a clamp on the base of each nipple so only my big pink buds are left protruding.
I stimulate them in a variety of ways: by pinching them manually, by rubbing ice on them, by flicking a pen rapidly over them, by rubbing a small mirror on them in circular motions, dripping candle wax on them,tapping on them, rolling them between my fingers etc. Since my nipples are pinched so hard by the clothes-pins and clamps, the need increasingly stronger stimulation as they go numb. So I clip tight hairclips onto them and move them about until they can't take any more arousal.
At this point my nipples are at their biggest, most aroused state, and I take off all clips from them apart from the initial clothes-pins and I begin to vibrate them with clitoral vibes. I have to lie down for this as my knees go to jelly, I shake and moan uncontrollably, and I start to orgasm intensely. It takes effort to keep the vibes onto my nipples but if I manage it, the orgasm goes on for several minutes. I typically can't help but fall asleep afterward...so good! Been writing this with clips on my buds the whole time, and they are tingling!