Several years ago my wife and I were visiting her sister and her husband at their summer getaway. We had been partying most of the evening.
The sister's husband had already headed to bed, and we three were also ready to pack it in. My wife and I were staying in a guest bed in the living room. We had just taken our nightly vitamins but had forgotten a glass of water. The sister-in-law fetched the water.
When she sat on the end of the bed, her pyjama top opened slightly and her left breast popped out. I just grabbed it. I don't know why I was so bold. I then reached over and grabbed my wife's breast. I said, 'Oh, look at this.' Under the sheet, you could easily see my hard on rising. I pulled back the sheet, grabbed my wife's left hand and her sister's right hand and placed them on my now swollen cock.
They immediately locked fingers and started to stroke up and down. After a very short time, I launched into what is probably the best orgasm I have ever had. As I lay on my back, my cum shot flew past my right ear. I still fantasize about that several years later. It was all unplanned and spectacular. I just think of it as the great double hand job!