It all started rather innocently... you see, one night me and my best friend Mandy planned to go to a show. Being the punctuality freak that I am I decided to go to her house a bit early to pick her up and maybe have a drink or two before we headed out.
Well, when I went to the front door and knocked nobody answered. 'Just like Mandy', I thought to myself. So I went to her living room window. I peeked in the shades right as I was about to tap on the glass and hesitated for a moment.
Mandy was sitting on her favorite blue recliner in nothing but her underwear and a very thin, tight crop top. Naturally I decided to watch for a moment and much to my surprise (and -- shhh -- delight) her hands stroked down to her small breasts and began to massage them. At this point I of course decided to make myself comfortable and enjoy the show.
As she continued to stroke her perky, little tits; her hips began to gyrate ever so slightly. Then she slowly slid her hand away, softly running her fingertips over her nipples as she did so. Her mouth opened slightly and it looked as though she was probably moaning (lord knows it took all my will power not to).
She ran her fingers back over her quickly stiffening nipples and began to lightly trace small circles on them with the tips, gently flicking her fingernails across them every now and again.
At this point her nipples were so erect that I could see them straining against the fabric of her shirt firmly outlined against the silky material.
Now, I was obviously very turned on by this and suddenly noticed my own nipples tightening to an almost unbearable stiffness... so hard in fact that they ached when my shirt brushed over them. I looked around to make sure no one was watching and decided then that it was fine for me to massage my own throbbing nubs while I enjoyed the rest of the show. So I took my rock hard nipples between my fingers and gently rolled them back and forth as I peeked back through the curtains to see what my friend was up to now...