A construction site is a construction site! The boss was young, short and blond, and the workers were all big blacks, with all that goes with it. I am not surprised that being alone all day in the office, this girl just got bored. Watching from the window, on the sweaty, muscular men, by the end of the day she just "
The girl's master is turned on by her crawling around him like a cat. She herself offers him the leash on which he leads her to make love. This is a symbol of his power over her body and her submission.