I had a friend "convince" me to compare with him a long time ago. He had seen my penis soft a couple of times, I had never seen his but he had already told me that I was a lot bigger than him. We were spending the night in the same room and the lights were off and we were each in our beds when he said that he couldn't help it, he had to masturbate. I'm pretty open minded and said it didn't bother me and I got a little turned on and decided I would too.
The lights were still off and we couldn't see each other but he started talking to me and saying things like "I bet my cock is harder than yours" and "I bet my cock is hotter than yours." He kept egging me on and so I started saying things back, "I bet mine is bigger than yours." This kept going on for awhile and eventually it was enough that we decided to compare. The lights were still off so we only compared by feeling each other. I stood next to his bed with my hard cock in my hand and grabbed his with the other hand. The size difference was pretty striking. When I held his penis it didn't even fill my fist. He grabbed my cock, my hand was already wrapped around the base of my cock and he put his fist above mine and both of our hands couldn't cover the full length of mine, the head and about an inch of my shaft were still exposed.
After that I went back to my bed and we both finished ourselves off. At the time I didn't regret it but now I wish we had done a bit more comparing and had turned the lights on. The size difference was a really big turn on for me and I still think about it now. I've also thought about finding a guy online who could help me recreate the scenario and maybe go further.
I think if you were in the same situation with an open minded friend it might work. Just make sure your friend is open minded.
