Hi,
An anaretic degree seems to be connected to 'difficult expression', yet the school of thought through which I was taught expressed the anaretic degree as 'the graduation class'; a culmination of expression of the sign for the planet/point in it.
The MEAN and TRUE Black Moon Liliths are astrological points. They are not outwardly physical of nature as a planet is. They are felt more as a deep inner feeling, a natural talent, attempting to find expression in the outer world. They are strongly associated with 'that which is physically non-existent', as represented by the longings, yearning, cravings of the sign in which they are placed, that can become the created inner images of how circumstances could, should, would be.....'if only'. MEAN BML seems to correspond to those images of childhood experiences that can have a strong bearing upon how one lives one's further life...positively or negatively speaking. TRUE BML (H13 in astro. com. charts) appears to correspond to the wisdom of age through which these same images are experienced through their true perspective.
I have not studied the asteroid called Lilith.
MEAN BML can 'disconnect' and/or turn from the feelings of the sign it is in
when it experiences situations, or itself, as 'unacceptable'. (Self) denial of a natural trait can occur until the occasion arises when it is necessary to express it.
Libra is associated with the essence of harmony; that which says that 'all men are created equal'. The MEAN/TRUE Lilith can undergo experiences that show how true or false this Libra feeling within it is.
Natal BML in Cancer appears to be most concerned with the natural inner
feeling of 'emotional security through caring and belonging'. Yet it can act and turn away from showing any feeling at all.; an attitude of 'I don't need anybody'. Issues with the biological mother and/or parent are often noticeable and can be a reason for doing so.
Instinct seems very strong and it is in this position that BML finds associations with that which would appear to be extinct, yet isn't. The family/tribal rites, etc. A 12th house MEAN BML in Cancer could (dis)connect with ancestral influences.
I don't know to what you refer as MEAN BML in any semi-square aspect, Kitchy. I don't see them. Astrologers who do not use 'out of sign' aspects would say that MEAN BML is unaspected. If out of sign aspects are permissable, and with a maximum 6 degree orb I personally use, there is a Sun-BML opposition, Moon sextile BML, and a Chiron quincunx BML.
Your strong feelings towards your son are only natural because you care so much. The mother instinct is there in you; you've graduated into expressing feeling, even if it is hidden. Yet if you see much in him that acts as created images of your own life experiences, this could play a role in your 'morbid concern' for him.
Natal Saturn would be too wide for an opposition with MEAN BML. Yet it IS in its own sign; the orb could possibly be extended. You also have a Saturn-135-Pluto. Reality versus imagery?
I use the word 'seem' because BML produces the 'appears to be' that can take on a disguise, 'the presence felt' of what truly is....or should be.
Any feedback (also via PM if preferable) for study purposes is welcome.