Doesnt sound like the same lady, but your post reminded me ... I had one of the filthiest punts of my life in Brighton in the 90's.Similar to what you've described, I couldn't believe I had stumbled across this lady in a working flat advertised in the Brighton rag. Very pretty English lady in her thirties, slim, big tits and I can tell you, anyone would have thought she was paying me, total nympho, my first anal session, and just about everything else in the book. She practically molested me for an hour.
When I left she was still playing with herself !!