I was 15 when I discovered I was an exhibitionist. I had developed quite a large penis by then: 9 inches long and 6 inches circumference. I was constantly getting erections. They would pop up unexpectedly at any time without any sexual stimulation.
My penis would get huge, rigid and ache until I could masturbate and get it to soften. My 12 year-old sister noticed the bulge in my pants and told our girl cousin who was also 12 and some of her friends about me. I was taking a shower one day when I heard giggling outside the bathroom window. I could hear my sister, girl cousin and one of the neighbor girls whispering and giggling.
When I realized they were peeking at me I got the hardest erection I had ever experienced. It surprised me how horny it made me being watched by these young girls. I wanted to masturbate so bad but I lingered near the window enjoying the incredible pleasure listening to them whisper to each other about my huge erection. I remember masturbating over and over for days. I couldn’t stop thinking about them watching me.
After school one day when sis and I were home alone I was changing clothes and I couldn’t find any underwear. It was not unusual for mom to accidentally put underwear in the wrong dressers so sis and I would find ours in the other’s room. I realized I needed to go check her dresser when I remember the girls peeking and my cock and got rock hard again.
So I decided to see what would happen if sis saw me in my aroused state up close and personal. I had this fear she might freak out and tell mom so my heart was pounding as I walked to her room. This just made my erection throb and twitch even more and the veins on my shaft swell like they could burst. I walked in with my rigid penis sticking straight out wobbling around.
My sister saw my condition and gasped wide-eyed and open mouthed saying “Oh my God!!” I said “I can’t find any underwear, can I look in your dresser?”. She nodded yes and stared at my erection as I took my time looking through the drawers. It was such a turn on. I could feel her gaze on my rigid pole. I felt like I was about to orgasm as pre-cum oozed out of my swollen glans.
“You’re such a naughty boy” my sister said. I asked her “Do you want me to just go back to my room?” She said “No!” That was all I could stand. I began playing with myself stroking my aching erection and I said “Look how hard you have made me!” She just giggled and said “It’s so big.” I couldn’t hold back and released a torrent of cum. She squealed with delight.
I started hanging out nude around the house when sis and I were home alone. Eventually I would show my rigid cock to my cousin and sister’s girl friends. They always encouraged me to stroke and cum for them.
