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.
If a girl has agreed to work as a maid, she is well aware that sooner or later she will have to face her master's cock. To have a good relationship with the client, in her profession, is extremely important. After all, she doesn't turn down money herself. So in her mouth she took rightly, and he pulled her rightfully. And he feels good and she's kind of a stranger. And you do not have to tell the mistress of the house about it - now she is already well provided with tips for additional services :-)
Pretty good preparation for class, but it's not about learning. The classmate is pretty on the face and figure, but these bushes in her panties are a little repulsive. Too much thicket. Sometimes you want a little hair for a change, but that's not the case.