Considering that D just formally broke from what was holding back her experiencing the larger world on her own terms, I'd kind of expect her to find interest and attraction in LOTS of new places/people to her refreshed eyes
. Seems expected, honestly (and, what I thought might be part of the equation for tension that could build into a more complex Chapter 3, honestly . . .) .
The natural routes to explore that we already know are possible don't bother me, even if D suddenly wants to go for a three-way or even her own time to try something/someone new. But, I can see this leading to the issues mentioned above because she is still new and naive to the implications of such things (in her own heart and those of others), I feel.
Of course, this could be even MC getting into something - with D's knowledge , at least initially - and not just her direct desire at play. Maybe her curiosity allows this experimentation and then she starts to feel unexpected regrets, jealousy, envy, etc. that come with being a fully-fleshed individual who just plopped into the world afresh.
. . .
Jeez. Can MrDots put a goal into his fundraising that ensures we see a Chapter 3 if reached, perhaps? So much that can be done with these characters and their settings as they stand today.