a couple of years ago i did the same thing. Me and a friend were just sting around and i turned on some porn. He got horny i joked him because i saw his pants move(he got hard) and he said shut up at leaste i am bog enough to make em move we had a debate over size he wipped it out so did i. I just started stroking mine after i showed him and he started stroking his. We ended up just sitting there stroking and looking at each other. Over time we ended up jerking each other.