Nipple Pain

My nipples get hard so easily, and they are so sensitive that sometimes when they are overstimulated it is painful. That pain has become an integral part of my sexual excitement every since I was a teenager masturbating. Rolling and squeezing my nipples in my fingers while rubbing my pussy and clit with my other hand became a daily activity, sometimes three or four times a day whenever I could find a moment alone, in my bedroom at home under my covers pretending to be napping, or watching tv in the living room surrounded by my family covered by a blanket so that nobody could tell that I was surreptitiously masturbating while we all watched a movie, or even in a bathroom stall at school while my fellow students walked in and out of the washroom. I still love to sit on the toilet in a bathroom stall at work, masturbating until my fingers are glistening with the juices of my cunt, my nipples red and raw from the abuse received from my fingers...