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.
She seems to like working in the service industry itself. )Stepdaughter's legs are magic, not everybody is as good with a cock with her hands as she is with her feet. Well, and between them all the wonders - vagina just flowing with juice, apparently very long wanted to seduce the stepfather.