I've seen a lot of things, but I've never seen group sex on stage before. And the most amazing thing about it is that there are no bored faces in the audience! Everybody likes it! Well, direct participants are twice as pleasant: they suck your dick vigorously and the approving attention of the audience. The final chord, bukkake, is so organically blended into the atmosphere of the evening that you cannot help but wonder if it could have ended differently!
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.
Nothing foretold: after gently shoving a finger up her anus, to fuck her so that the walls were shaking! It's amazing how her mouth was able to accommodate his cock.