Never had a mutual shower with a masseur. Back when Babylon Men’s Spa in NYC had that crazy rocket ship looking plexiglass tube rain shower, I had such fantasies. I once did ask my favorite masseur to join me, he declined. Table showers are the closest thing, and I’ve had a few hot ones.
The summer of the great NYC blackout, there was a masseur in Murray Hill who offered me a cooling bath (there was no AC). He didn’t join me but he did lightly scrub and massage me more while I was soaking. Very nice, sensual and re-happy conclusion.