it's a tricky one i think, narration can really make or break any audiobook and i reckon that is even moreso for erotic audiobooks. might be worth digging into the romance genre because there is a lot of stuff in there, lot of genres with varying levels of smut and it is usually pretty well tagged so people can find their niches more easily. there are a bunch of audiobooks in that vein and if you're in luck people will have reviewed that version.

i have definitely found short audios that have some story to them but it really is mostly a couple of vague plot points with porn hanging off them, which is fun too, i just haven't gotten around to going on a treasure hunt for more substantial things yet myself so i'm sorry i don't have anything more specific!

I sometimes listened to stuff on https://www.reddit.com/r/gonewildaudio/ but thats as far as I got.