I got very, very lucky one time, going back to the early 1990's.
Smallish parlour which was run by sisters, aged 19 & 21 - both natural blondes, slim, lovely looking girls.
On the day I booked, they were the only girls working out of about 10 on the rota.
Paid for 30 mins with the older one ( I think it was £30 inclusive) and after 10 mins, the younger one walked in, said she was bored, got naked, and simply joined in the action!

My very 1st duo, unprompted & unexpected - absolute heaven, I could not believe my luck.
I offered her a fiver afterwards but she declined (it was all I had on me)
Obviously, I remember it to this very day.
It sounds so implausible these days but, you have my word, it happened
