First like the D with a fox tail idea.
Second if you think D is real OK problem. D (and every character) is ultimately just a set of 1's and 0's which is why some fans were pissed at Patreon's fit over Elena and Jen's look (personally I wish they were a bit "curvier").
IMO DMD has gone somewhat beyond fapping material. Just look at how much of this thread is about what's-next speculation, it's part of the fun of the game.
As with every work of fiction or nonfiction in some people this brings up past real world experiences. There is actually a form of therapy called Bibilotherapy where patients read books dealing with issues from which they are suffering.
DMD is well written (needs more typo editing), the main female character was designed to be a hottie and there has been a lot of drama about which to speculate. Ironically the Patreon Purge may have given this game more fan loyalty.
Audience immersion in a piece of well done fiction is not uncommon, talk to a Lord of the Rings (books) fan. It's when a JRR Tolkien fan starts to quest for the One Ring you got a problem.