I sourced the pictures in preceding posts from Blushes 47, a 1980s British Spanking Magazine.
I've noted here before that pictures like this were an early influence on my kink, and that they were almost never accompanied by their original text back in the Usenet days. A few grainy pictures at unfathomably slow download speeds is all we had back then.
The original story is online though at:
https://britishspankingmagazines.blogspot.com/2011/01/mr-nights-new-attraction.html
This is a little confusing as it purports to be set in 1995, even though it was published years beforehand.
The prose is classic Blushes with a lecherous boss 'training' his new assistant who is employed purely for his gratification and that of his more important customers.
I don't think anyone refers to having a 'nice saucy bottom' anymore, or indeed giving an 'invigorating thrust against the ripe bulb of her bottom', but wording aside it's an interesting insight into the fantasies of the time...
This is not entirely the end of the story as Blushes 47 reprinted the pictures from an earlier edition, Blushes 25, which had a different story, likely making the pictures around 35 to 40 years old:
https://spankingmagstories.blogspot.com/2020/08/the-junior-secretary.html