I have heard of subs serving multiple ladies as a GS slave during a single session. The sub would go to one of the dungeons in NYC or SF or wherever, be set up and used over the period of 2 or more hours by many ladies. One mistress would be his "guide" disciplining him and the rest would use him at will. Is this still possible anywhere and how would one find this? There are still dungeons in NYC that this is possible but I havent heard of it lately.

The places I think this would be possible are those where there may be dommes available for set hours on a schedule. So like the Gstes in SF or PB in NYC. Possibly the Fortress in NYC, but they seem to be less on-hand from my experience, but it is very easy to work with them and you may be able to craft a multi domme session around that theme.

My advice would be to session at one place first, then request it in a next session. Obviously I think you'd have to pay more and could be subject to availability. I think the Fortress is a good option as you can have one focused on you and two or so drinking water and using you as needed.

Sounds fun

I've done a 6- Domme GS 3- hour session before, we used a baby pool in the basement. We chained him to the floor and simply took turns. It's definitely possible but not on a tight budget!