If he takes out his big cock for every fault and shoves it into her maid, I wonder even how much he pays her? Or on days like this, let's call it inspection days, is the pay separate? However, who would resist such a beauty, who turned out to be a great specialist not only in cleaning, but also in bedding. With such talents she would find a job in another area - with arms out of their hands!
That's what a personal assistant is for, to always be there when the boss wants her to be. And to do what he demands. This man wanted to relieve the tension - the assistant was at hand, without hesitation and took advantage of her. According to her cries and sighs conclude - this is the work she likes!
To tell you the truth, considering the age of the brother and sister, it is quite normal that the brother became aroused by the sight of the naked girl in front of him. Maybe what happened next is not part of the plans of normality, but tell me honestly, would you resist such a dark-haired beauty? That's what I mean.