I had never given my nipples much thought until about two years ago. All of a sudden i noticed that they were hard and pointy frequently and they seemed sensitive. I started playing with them and they were amazingly sensitive. I love how they make me seem to go into a trance when I play with them.
When its warm and I have my shirt off I usually play with them to keep them hard. I walk around with hard nipples most of the time.
When I am alone, I start flicking the tips with my forefingers and drop my pants so I am naked. I get very energetic and start swinging my hips up and down with my penis flopping all around. Soon, he starts to swell and soon i am rubbing my nipples swing a hard penis around. At this point, I don't care who sees me.