Friend Masturbates

I'm not gay. I had a number of what I call same-sex experiences with three different partners when I was much younger. None of the three were one-time occurrences. In each case there were several episodes. It happened and was repeated because both wanted it. I learnt one thing from all three, I am very turned on by another's desire/self-stimulation/orgasm, especially self-stimulation. I'm going to tell you about one of them, Terry(not his real name), 2years older than me, was my best friend, at the time of the story. I masturbated from a very young age. I also did not ejaculate until well after my 16th birthday; I had a lot of orgasms without semen. I was probably 14 & Terry around 16 when I spoke to him about this. I remember it was tricky, because I didn't want to actually admit that I masturbated and I didn't want to admit that I had orgasmed on a few occasions when we fondled one another. He never came; he'd always end the episode when he got close to orgasm. I didn't. I let the feeling flood through my body and contained my involantary jerking as best I could. Why? I don't know, maybe because he was able to stop and I didn't want him to know I could not, that there was a point in our fondling when I was incapable of stopping.  He said, I'll show you what it looks like, what it is. We were walking on a trail in the hills behind their house and had stopped for a rest.  He was wearing shorts. He pulled up his shorts on one side and took his cock out. It was already hard. I could not take my eyes off him. While he masturbated I looked at his cock, then at his face to see if there was any expression, then back at his cock and I was transfixed for the entire time. It wasn't long. I could see his cock getting harder. He did not have to tell me he was about to cum, I could see it. He said, look! It's cumming now! And then bang-bang-bang semen burst out in spasms. He said, now you know. I knew orgasm. I knew that semen came out of a man's cock. I didn't actually connect the two. I was totally surprised by the force, the spasmodic pumping. I thought semen just kinda dribbled out during sex. I was very naive. While he was masturbating I just watched, but when he'd finished I had reached "that point", the incapable of stopping point. My own orgasm was on the way and would probably have happened without any physical stimulation. But I took out my cock, considerably smaller than his(it has always been and remains even in adulthood smaller than average) and came immediately. That episode helped me see my turn-on button very clearly. I get so turned on by another's sexual feelings, their wanting and anticipating their orgasm, straining & tensing their muscles while masturbating and seeing the actual orgasm knowing they want to share their pleasure experience with me, allowing me to see it. I think it's the willingness, their desire to let me into that very individual and private space of cumming while masturbating that is the big turn on. It's a very intimate thing.