The offical blog of the Succubus Collective
https://succubuscollective.wordpress.com/
The purpose of this blog is to share information from the Collective, and to spread general knowledge of succubus, their world and their allies. Updated irregularly based on the wishes of the Collective.
Comments and discussions can be posted in the forum linked on the blog, but in general the main activities take place on anonymous imageboards like 4chan, 8ch, mewch etc, under /x/ or /fringe/.

Spirit Train Chronicles
https://spirittrainchronicles.com/
Host of the weekly galactic lightship dreamflight events, a simple and effective method for astral travel, which can be used to visit any place you want after you learn how to do it. This method, once learned effectively, also works for visiting the Collective. The ship Ceilidh was manifested specifically for the Collective and can be used for succubus interactions.

NOTE: 1mg
Activities and interactions on both blogs are free in the sense that there is no fee for participation.
Please be aware that deals made with the Collective or individual members may require you to pay a fee based on the nature of your specific request.

Have you heard about Erik Vonroth?

Hi, thank you. I read all the word press. I have not read astral yet. So far so good. Interesting. Many thanks for sharing.

Update: Some of the sites in the OP are no longer online/active.

The Sunflower Project - a meeting place for esoteric discussion and group sessions

The open discussions are usually held on the new 8kun.top website, under /sunflower/. To avoid irrelevant topics/spam, this board is unlisted, you will have to manually type in the board URL to find it.
There is also a second option, a "bunker" board with the same name on endchan, this site can be accessed with different prefixes, availability may vary over time as this is a website being worked on continuously. Try .org .net or .gg for this site.