The only way to change a fantasy to reality is to act on it. Until you do its just fantasy. Of course a fantasy requires nothing and therefore is easy to continue with. Changing that is the difficult part because it involves some else and their ideas may not mesh with yours.

Well lets see I've had two women at once before four times,hmm been in a train once,not gang bang a train is one at a time. Hmmm had one woman shared with a buddy five times. Hmmm lets see the one I would really enjoy would probably just be nude at a party full of women and let them just have their way with my body say 10-12 women. They wouldn't have to fuck or suck me but could if they wanted to just walk around and let them touch grab play get it hard and make it pulsate whatever. Basically just be naked at a party full of nothing but women drinking and having a ball.

Wish mine would come true..

Yes a few. All can be seen on my page.
Fantasised about playing with a pre-op transgender woman and that happened... it exceeded my expectations. Fantasised about an FFM 3some, that happened and was good fun. Fantasised about black ladies and they are now my favourite. Blacks are 80% of our population so a logical conclusion.
There are a few more...

A very satisfying submissive-sex experience with an expert-Dom gay escort.

Yes, a few. Fucked an Asian girl, sucked a black cock, fucked by a black man, and been spit roasted.

Wife and I are swingers and have had so many fantasies cum true.

Hey sounds great. Everybody just DO IT..

Yes. Multiple fantasies actually. Married for 25 years, together for 30 and in the last 10 or so years we've become a bit more adventurous.
my 2 women fantasy which was also her lesbian fantasy
her 2 man fantasy so my cuck fantasy was lived out too
foursome with another couple. same couple, we had the sharing fantasy. spent a weekend at a hotel, different rooms, together by day but swapping spouses at night.

more to come as the years go by