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 cab driver was really lucky, not everyone gets such a lucky client. And how this client has passionate sex with him, just a sight to behold. Moaning, so naturally and passionately that unwittingly you start to catch yourself thinking that this is not a porn movie, but a real life case of a hardworking cab driver filmed on a regular video recorder.
it's a katsapka, not a Ukrainian)