My sister was 17 and certainly what you might call rebellious.
Like most boys, my curiosity then about girls was bursting! I would spy on my sister, not because I wanted to fuck her, but I am what you would call a geek, and so I lucked out with girls my age,
So, Sara provided me with my first view of a girl naked from behind, and a couple of flashes of her small but lovely boobs now and then.
As I got to be almost 16, Sara said to me that she knew I spied in her, and she just shucked her robe there and then. Nothing more, just stood there naked, turned around slowly, put her robe back on, smiled and walked out.
I was hard as a rock, but for some reason I didn't jack off.
I heard the door go and assumed I had the place to myself. I walked still hard to the bathroom intending to rub off.
I really don't know why but I opened the hamper and there were Sara's panties on the top. Now remember, I knew nothing about girls, but I knew her panties had been next to that secret area I had only just seen.
So, I rubbed slowly, looking at the marks in her panties. Then, again purely by instinct, I smelt them. The result was an instant orgasm and cum jetting out so hard it stung a bit. Sara's scent really hit the trigger big time.
I just let it go onto the bathroom floor until after what was easily the longest cum I have ever had, it stopped.
That's when I heard the giggle. "Next time, catch it in my panties...it makes less mess, and its kinda kinky"
Sara hadn't left at all. I guess it was her turn to spy on me.
We got into a conversation about how often we did ourselves, where, what we thought about..and it wasn't long before I was hard again.
I had another cum that morning, and not by my own hand,