Spitball your ideal doujin/hanime/eroge concept! And discuss the fetishes behind it!

This is a fetish discussion/creative writing focused thread for stories, novel concepts, power systems, worlds, and magic/tech/biology that accentuate your strongest fetish. This thread is meant for more digestible idea pitches and musings. Discussion of proper full-form literotica and it's resources goes here >>11255277
If you have a full verbose work you want to discuss; summarize it in greentext, bullets, or a qrd.

Post your ideas be they ideal doujins you want or sex games that don't exist. From whole sex-based fantastical worlds, to sex enhancing magic, to simple descriptive scenes featuring your fetish.
I had considered making this thread ONLY tentacle/pregnancy as some of /d/'s more absurdist offerings put me off but I don't want to stifle discussion. Novel imaginativeness can be appreciated no matter one's tastes. Feel free to take elements of anons' ideas and rework them into your fetish, and give (You)s as people like their ideas being considered.
I for instance love pregnant sex but dislike humanoid birth. I instead love tentacle birth but actually prefer humanoid sex slightly over tentacle sex. These contradict each other but I can integrate them into one fucking hot concept by simply giving the tentacle swarm a humanoid transformation. Add my love of sex magic and temp-futanarization and we're off to the races.

If you have significant writeups reply them to the Idea Anchor post.
I'm also making a "(You) Anchor" after it. See the post for details.
Previous thread: https://desuarchive.org/d/thread/11254542/
First thread: https://desuarchive.org/d/thread/11131196/