Get on FetLife and find a local lgbtq-friendly bdsm group. In my experience, the venn diagram of lesbian/bisexuals into bdsm and the occult community in any given area is just a circle. Bring baked goods to the munches and ask about local covens. Once you’ve established yourself as not a creep, it shouldn’t be that hard to put the word out about the grimoires.

I’ve done about half of this, but I’m not into witchcraft.