This happened not too long ago. My friend and I had a HUGE test the next day so he invited me over to study. When I got to his house we studied a bit and then he said 'wanna see something?'
I'm like 'sure why not.' So we went to his basement and in this old box were all these porno mag's and videos. Seeing his parents were gone he went upstairs and put one in the video machine. He asked me if I mind if he jacked off and I could just watch if I wanted, but no, I whacked my cock out and started stroking it hard and fast. He was just about into an orgasm when he took me cock and put my hand on his and started jerking me off.
Then we both exploded I shot my load all over his face and that was it was the most erotic thing I have ever done.