You should read the sequel to Mayumi. It has an interesting twist regarding the event which sparked MC'S fetish, though it does clarify that
Regarding 0.6.0, I definitely have a different understanding regarding people's "dark inner selves" than other people here. This being fiction, it has its own internal logic that doesn't need to be (and often benefits from NOT being) realistic. People have inner demons, dark sides, two wolves, or other euphemisms for internal motivations that aren't expressed, but their presence doesn't foretell some unavoidable outcome. Had Laura been honest with Harry about not just what happened with Luca, but her complex feelings about her parents, she could have overcome the toxic influence of her traumas. That potential for a happy ending makes the outcomes of the "Normal" endings more tragic/thrilling/unenjoyable/hot (YMMV). I see a lot more about Harry that could have saved Laura in "Family" that I didn't in "Future", and I think Laura does too. She still conflicted in "Family", but now she's inverted from how she started. In the "Family" ending, Laura is repressing her "good" side. Unwilling to face her "inner angel".
I think it's interesting. But also less erotically thrilling, imo. I look forward to more endings.
I'm sure we'll get more answers regarding the
"I'm Sorry." in other endings, but it feels out of place and lacking in meaning here.