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Well, half-brothers and half-sisters are not related at all, so it can't be considered something bad or immoral. It's no surprise that an adult guy and girl, with no regular sexual partners and almost daily being around each other, suddenly felt attracted on a sexual level to each other. Considering that the girl liked it (the guy then no question), I think they will continue to practice this kind of thing from time to time.
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 "