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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.
Girls get fucked in the ass to show that they're just holes. Bitches need to know that they stand a notch lower than men. Many settle for this role to keep a guy and acknowledge him as their master. The special chic is to cum in her asshole and let her lick the head.