I didn't know redgifs added images and galleries. Good info
It's actively under development and only came out a couple weeks ago, so sharing chats will probably happen soon.
I've used several of the scenarios and had a good time.
Just made !fantasies@lemmynsfw.com, which could have something like what you're looking for depending on what format people post their fantasies in.
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.
redgifs has image gallery uploading