This drove me crazy
I met a sexy young guy who was supposed to be just a makeout buddy. He told me he liked to watch women masturbate & I was like, I'd have to know someone a long time etc, but when I felt him rubbing against me I got wet and asked him to stroke himself for me. He's a surgeon so I figure has skilled hands. I got really excited so it was only fair for me to slip off my panties & just go at it with my fingers. I alternately stroked my clit, and played with my hole, with 1 finger.
After a while...I got really wet, made myself cum again & again, and had the best orgasms I ever had, not counting during sex. So the next time, I had been telling him I had these voyeur fantasies, so he wanted me to lie on the couch in my living room, naked waiting for him, while he watched through the window. Once I saw he was there, I masturbated in plain view, butt naked. Fucked my wet pussy-hard, with a big pink vibrator, so he came into the house and we laid side by side and watched each other masturbate & cum..he had never seen anyone squirt before and this time the orgasms were even better.