Just made !fantasies@lemmynsfw.com if anyone would like to join and contribute. Here's the description:

Post your fantasies, your fetishes, and the sexual scenarios you get a thrill from imagining, whether they are grounded in reality or defy the laws of physics.

Primarily text-based, but visual aid is allowed. Make your posts with vivid graphical descriptions or keep things vague and let the discussion flow from there.