I've done this several times in reception, and quite memorably once on the stairs at parlours - just ask!
It's not likely the other girls are going to be prudish afterall...
And sometimes I've paid an extra £20 for another girl to watch and fondled or kissed her while I fucked the other - sometimes its hotter than others, but hey
its a lottery. I've had commentaries from the other girls, and fucked one on a reception counter while her colleague counted the days takings and rang the boss to tell her it was a dull day. One of my absolute best experiences was fucking a girl at Spangles from behind while I played with another's wet pussy through her panties as she sat on the back of a sofa watching.