I'm a huge fan of watching women masturbate. Most of the partners I've had have been fairly shy about this and I'm not pushy, so I haven't done it many times, but I adore it. I love being watched as well, if the other person is really enjoying it. I definitely have a preference for going one at a time instead of both together, so we can each have each other's full attention. Although both are fun for different reasons.

I always fancied a domestic situation where one of us could say "hey, would you mind stopping what you're doing and cumming for me?" and we'd do that willingly, and the other person would enjoy it. I've suggested it to a couple of partners but they have alas not shared my enthusiasm. But there have been many times when I've been looking at my other half and thinking "I so want to watch you get yourself off right now."

I think my biggest never-going-to-happen fantasy is to have a group of mixed men and women, maybe 6-10, and the activity is that we each wank one by one and everyone else is really supportive, saying encouraging things about how you look and how you're doing, and all feeling excited when you finish. I'm not usually that keen to watch other men but I think in this context it would still be pretty cool.

Alas, that's an oddly-specific thing and although I've googled it many times, nothing has come up.