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 :-)
She's not so good that you'd cheat with her.