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.
It seems the brunette herself realized that a satisfied trainer is a good trainer. It didn't take long for her to get all conventional... The pussy-licking trainer was quickly found, too. So the trainer didn't even have to unbutton his pants - the girl handled it herself. I love this kind of advanced student sports. )
Write your number. I'll give you what you want.