I've seen some topics about people having relationships with spirits, particular demons

[Mulberry]

That sort of thing can be found in the “Love, Sex and Relationships Category”. This popular thread should get you started.

Letter Of Intent - How To Evoke A Succubus/Incubus *update*

I’ve been given some thought about doing a thread about this for some time now, and here it is. Qabalah spirits and entities under the influence of Lilith, Naamah, Agrat bat Mahlat or Eisheth Zenunim can be in the darker aspect within their appearance. Reading about others experiences of these entities it seems like an uncommon manifestation, but it should be considered a noticed “warning” in case that happens. The “warning” is more of a consideration to be prepared, rather than abort the event…