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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.
The lady is gorgeous, pure sex! Such can inspire a man to sexual exploits even if he is very tired at work! But I would not advise to go on business trips with such a sultry friend, she obviously can not do without sex for a day! It's good if she is good with a vibrator, and if not?
I would like that