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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.
That's quite a girl. She took two guys to her bed. Able to do much, gives a great blowjob, and takes two dicks in her pussy at once. Guys were absolutely delighted with such a partner.