I've sucked myself in front of 2 women.. the first was when I could barely reach, and while she was totally part of it, sucking my balls and asking me what she could do, she never asked again.. but that's when I could barely lick the head.
the next, i'd dated for a long time and just whispered that I could do it one night during her having like 10 orgasms, which is rare.. I was so turned on that I said it.. since she was worn out and I was still hard, she told me it was a great time to try it... she helped me suck on it some while I got a couple inches in, but couldn't go that much because of the distraction of her being there.. and being a bit tired...
she has mentioned it since, but never really asked for it to happen..
I've wanted to do it in front of a few women, or perform it for them, or to lick her clit while she moves herself on my cock.. that might be the one most likely to get her involved... lol.