I discovered a new way to masturbate with a friend fifteen years ago. I had just got to know him, and he invited me over and asked me to jack his nice long erect penis. I had masturbated with a few guys pleasurably. He was so large my hand got tired and had to quit. So he lay down on his back in bed and asked me to kneel over him, which I did, pulling our erections together, then stroking them slowly and gently.
But I somehow instinctively slipped his long and thick cock beneath me, only to discover that it lay along my crack, not it it but beside it, and I found myself slowly stroking the outside of my crack along his erect penis. Gosh what a turn on it was, and he liked it a lot, too. I stroked my penis while doing that and ejaculated on his face, which he asked me to do. I then took his erection in my hand and stroked it to ejaculate on my face. I have never done that again but would like to do it.