Okay, that definitely changes things.So, GEMINI. That'll make a difference, too. 8H GEMINI is going to be different from, say, 8H PISCES. Automatically, EROS and BML have some Airy, 3H 'Geminian' energy. They're going to be more light, possibly fickle, multitasking, and communicative. These may be rather noncommittal energies, which are comfortable with flippancy, and 'guilty' of the same.
Since we're dealing with the 8H, that's definitely going to make it a more Geminian, than, say, Scorpionic, or 'traditionally' with what we'd associate with 8H energy. (Ironic, I've always thought, as a GEM 8H is typically associated with a Scorpio Rising; typically, but not always.)
So, Lilith is 'mistress energy', so to speak: it's femme fatale. Independent. She wants what she wants, and she's not afraid to get it. A GEMINI BML is more likely to express itself in those more classically Geminian ways: flitting, maybe even stretching itself too thin, with a natural sales or 'ad man' approach. Sparkling conversation, charismatic, but just a bit too glib or changeable at times. You'd say your BLACK MOON is a bit of a sexual changeling.
EROS here bestows many of the same traits, and indicates you might seek the same in a partner. Your own 'sexual soulmate' style is actually rather noncommittal and fluid. I may be mistaken, but weren't you on the poly thread? If so, that makes a lot of sense. I can see a GEMINI EROS / BML in 8H being polysexual, or at least unlikely to settle easily into monogamy. You like variety and need to keep it moving.
As this is undoubtedly 'the sex house', this is going to show a style which is versatile and more than a little fun and lighthearted. Sex isn't serious business, with two sexual points -- dark feminine sexuality (BML) as well as that part of ourselves society considers taboo and nonconformist, along with what I can only describe as 'masculine soulmate sexuality'; no doubt a woman has EROS, but it is the counterpart to PSYCHE, which is more easily expressed in a woman's chart; much like MARS and VENUS.
In a woman's chart, I've most often found that her EROS corresponds to the sort of man with whom she can consider deep, committed bonding. Serious sexual relationships -- the kind which involve love and romance. 'Sexual soulmating'.
Yours all being in GEMINI causes it to get kicked down a few notches, more into the casual side of things. Your natural instinct is to bond more superficially, and possibly satisfy many facets of yourself with different types of -- or even different -- partners.
There's rarely JUST the thing written on a particular aspect or set of them. But in general, we combine the energies we know and build a picture of understanding from that.