Maybe it was the same Masseuse who suggested to me and my mate to see her together. We were both visiting her and she knew we knew each other. He was well hung too and she always complimented us on that. And let me assure you, there was nothing bi. He's married and I've been twice married.
Anyway, we agreed and had some sensational sessions with her. No intercourse but huge fun. A truly delightful woman. And yes, it was like you said, like watching porn and being part of it too.
PM me to check whether it was the same delightful woman. The massage shop was on Sydney's south to south eastern side.