I fully agree with Jill in principle, not necessarily in the application of the principle.

Good manners can be understood in a wider acception: the slave is supposed to do certain things in particular ways, because her master and/or his guests just like it that way.

I think that the particular case of a slave orally serviceing her master and, perhaps, some guests of him, is a good example .... I requested my slave to learn giving blowjobs not only in a generally considered "correct way" but to adapt herself to the peculiar tastes of every of my abitual guests ... each one of them had his own preferencies as far as technique, rithm, pressure, suction and variations were concerned.

Open eyes were not a question, but, for instance the constant use of her hands (when not bound behind her back) for tickling and caressing the balls, was an important rule she had to observe. Another rule was that she was not supposed to forget that the sight of her blowing a guest was to be an enjoyable and arousing view for the other gentlemen waiting for their turn.
Therefore I instructed her to keep her ass well lifted, knees apart, to allow an unobstructed view of her wet cunt and not to forget to wave or shake her tail in order to make the show more interesting.

Furthermore she was supposed to always adress myfirends with the courtesy form ( "her" ... unfortunately not possible in english) while we always used the confidential form you adressing her (some languages allow subtile humiliating possibilities indeed).

When we sat in my parlour on my armchairs, we just needed to snap our fingers and briefly indicate to have her doing her duties ... snapping fingers and just looking at one's crotch was the signal for a blowjob, indicating our shoes was a signal for her to take them out and thoroughly clean our feet after hafing remod the socks as well.

A slap in the face, either with hand or foot, signalled her that she was supposed to check the needs of another guest ...

Even when fucked, she had to remember some basic rules: if she was on her back and the men over her, she had to embrace him with her legs and always keep her feet duefully pointed foreward like in a ballett position... if she mounted a gentleman she had to keep her feet on his legs and arch her back.

The fact that she could not simply enjoy, but had to observe some behavioural rules added excitement and arousal to her .... of course, if we allowed her to climax, we would not control the respect of the rules and just let her enjoy.