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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 how wives would always let themselves be punished and disciplined for pranks. If she lacked sex and originality in a relationship, that's exactly what she got from her husband. Her lush body arouses her husband, allowing both herself and her spouse to get a high from the payoff. The toy is used together more than once, I think. Loved watching, gorgeous relationship with a twist between this couple.