I think you might be interested in an experience I had.
I was on a college band trip. We stayed overnight in a hotel, and everyone goes from room to room and party to party. I ended up drinking with two other girls and a guy. Both girls are short and buxom, while I am very tall. I was laying on one of the two beds talking with the girls and Steve sat on the other bed not saying much. He finally went to sleep, and the rest of us were drifting off. The girls lay down on either side of me with a head on each of my shoulders.
Karen, on my left, went to sleep pretty quickly, or so we thought. Tracy and I were still awake and talking about (naturally) sex. I was a little nervous at first, since I was wearing sweat pants and it would be a little obvious if I got turned on but, after a couple of drinks, I wasn't worried about it.
"To protect you," she said. "Karen was going for your nuts." I was a little dismayed - that was what I had wanted! So I didn't really know what to say. Then
She started asking me questions, using her knee to punctuate her questions and to nudge me when I didn't reply quickly. I tried to persuade her that her protection was not necessary, since Karen was asleep - I wanted to see what Karen had in mind. But
This went on for quite a while. Although she was fairly gentle, I had been hard for a couple of hours and my balls were beginning to ache.
She said, "I have a pair of those."
I said, "I know; I've seen them lots of times. I like them."
She said, "I think the next time I see you in rehearsal I will get you to tie my shoes. I'll just come over and put my foot in your lap, okay?" I could barely answer so she kneed me again.
I said, "Aren't you afraid you might hurt me?"
She said (kneeing me pretty good), "Not at all."
Then she reached into my sweat pants and started caressing my cock. That was it, and I started coming on my stomach.