Although I've always been curious I'm pretty straight (I think) and have only done this properly once, in my mid-twenties, although I've had a couple of other interesting "experiences" that I might tell you about some other time.
A couple of good friends were staying with me one Saturday night while they were in town and we went out for a few drinks. One thing led to another and we ended up going back to my place with what was clearly a very dirty woman in tow. We had a few more drinks and fooled around a bit. She put on a bit of a show for us, playing with her tits and fingering her pussy and getting us to do the same to her. She also got one of my pals to slip a bottle into her. It looked as if we were all going to get fucked and we ended up partially clothed in my bedroom.
Mate number 1 has always been the romantic type and a bit shy and took her off to another room. Mate 2 and I had another beer but after a while we decided he'd had long enough and went after them only to discover we'd missed the boat. I discovered later that she made a regular thing of this and had intended to get money from us as well as an evening's drinking. Anyway she'd asked mate 1 for money after he'd fucked her and he had been so horrified that she'd decided she was on to a loser with us all and couldn't be bothered with mate 2 and me. We tried to change her mind for a while but it was no go and we went back through to my room to crash out.
Things were fairly easy-going in those days and there would have been nothing unusual in us sharing my double bed. We were both in shorts and t-shirts but I was still more than a bit horny and before getting into bed I said so while giving my cock a quick rub through my shorts. There's was a moment's hesitation before he agreed with a laugh that he was also very horny and he started rubbing his cock slowly and deliberately through his shorts and so I did the same. Almost instantly I had a raging hard-on. I slippped my shorts off and took myself properly in hand.
I guess I'd never seen him naked before and up until this point I'd been a bit nervous and was looking anywhere but at his crotch so I got a bit of a shoch when he stripped off and I saw that he had an absolutely enormous weapon - there's no other word for it. I didn't measure it of course
but it was certainly at least 9" long and very thick, thicker even than you might imagine with such a length, with a huge shiny purple knob quivering on the business end. I just stared and when he saw the look on my face he asked what I thought of it. I said it was magnificent (or something like that) and after scewing up my courage I asked if I could touch it.
He didn't say anything but laid back in the armchair, let his legs fall apart and stopped stroking himself. I went over to him and knelt on the floor between his legs. I wasn't too sure what to do and at first I just gently stroked his shaft and tip with a couple of fingers but them I took hold and began to wank him the way I would myself. I cupped his balls for a while, had both hands on him at one point and basically just did whatever came to mind EXCEPT the one thing I really wanted to do. Somehow it seemed a step too far, amongst friends, to take his cock into my mouth and even although it was waving about in front of my face I restricted myself to admiring it with my hands and eyes.
I'd only been vaguely caressing myself while seeing to him and when he said he couldn't hold out much longer I went back to my own seat and began to wank in earnest. We agreed we should cum together and edged for a while, watching each other (I still couldn't take my eyes off his cock) but we were both too wound up to last long and each came over himself. Interestingly, although we both had large amounts of cum his pulsed thickly out and ran over his hand and down his cock and balls while mine squirted wildly everywhere.
We talked about it briefly the next morning and it was no big deal. My two mates went back home later that day ( a couple of hundred miles) and although I've seen mate 2 several times since then It's never been in the same kind of circumstances and neither of us have sought to repeat the experience. I've never told anyone about this before and reading it over it sounds like pure fantasy but although I've embellished it a bit so it reads better it's basically a true story and an experience I'll never forget.
They said I'd go blind but I'm managing just fine with the spectacles.
Happy to receive PM's from like-minded onanistas.