Some interesting background reading RE: the fact that D and MC didn't spend her childhood together in a parental relationship.Yay, I had a carefully considered (well., for me - which is probably nonsense for anyone else) post which intentionally downplayed the debate on legality to think about the power imbalance in DMD and what that might mean for the characters, etc. But, that got swept up in the Mod purge.
So, to summarize: I think that the power imbalance which is the elephant in DMD's room should be addressed in Chapter 3 somehow - i.e., despite their current trajectory, the maturation and experience gains of and by D should afford her the insight to question how much of her love for the MC was bilateral and how much may have been due to her idolizing a literal father figure. This could lead to an interesting "open" ending for DMD.
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That concept is by no means universally accepted in psychology, but it's at least interesting and relevant.