What I do find interesting is how DMD has (more than most VNs) created a character in D that engenders such strong emotions in players. D seems to have moved from an adult fantasy game hottie to in a Pinocchio-esque manner becoming a real girl.
Yeah, I've previously offered the comparison of her story as being that of a fairytale princess, getting help in being released from an evil witch's grip and finding the real world can be so much more than she ever felt possible to realize. So, I agree it make sense that she's become the "real girl" now and all the benefits (plus detriments - see below) that should offer.
I agree with you that even if the MC has moved past father and morphed into significant-other there is a distinction between that and degenerate.
Actually
Bestiality was in the tags when the game was first released. But, unless the dev team has changed their stance
Jeff Steel has previously asserted that kink was only seen as a punishment route, and not for D.
The Pet Arc could also be D role-playing as a Hello Kittty (or whatever it's called), or just soon having a route where D becomes super submissive. IMO D reverting back to a submissive mouse would betray all the character development of D throughout the DMD VN.
I still feel it could work as a heat-of-the-moment kind of thing that occurs, with someone like Elena (who we know has unexplored kinks to offer) to nudge that moment on. It's not necessarily a full fall into a sub-personality or complete moral degeneracy - more mainstream folks have fantasized and/or done weird or socially unacceptable stuff than we might realize and/or accept, I feel:
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Stuff happens and sometimes people might look back and say, "wha?" at those times, eventually recognizing how various circumstances came together to make things happen which they may have grown beyond since.
Another option could be that D does go too far in her partying ways and has such an encounter when already under the influence of drugs which help lower her inhibitions, affect her judgement, make her easy to lead on (i.e., temporarily submissive again, but not in a role-playing manner), etc. That could be used as a wake-up call for her and her support network to pull back the reigns a bit, learning from the extreme experience on how to avoid such pitfalls in the future, etc. And, it would still fit into a heat-of-the-moment event, just with additional influencers beyond being in the thrall of sexual insatiability and Elena, etc.
That is - and we're touching on the "real girl" emergence idea again - all her lifestyle freedoms should ideally come with a dark side of unforeseen consequences by certain excesses, I feel. Stuff that she needs to learn has to have some boundaries for safety's sake, even when you're otherwise going all out to have fun, etc.
