Others watching masturbation
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Once, a lady I was having sex with asked me about masturbation and said that she had always wanted to watch a man getting-off solo, but that the men she had been with before would never do it where she could watch.
So, I offered to give her the show she wanted. We were both naked, She sat up against the head-board and I got right in front of her and stroked my cock as she watched. She was turned-on and began finger fucking herself as she watched. She came first and was moaning around, so I came too, and shot my stuff onto her tits and face.
Later, she thanked me over and over for letting her watch.