I know I previously said that the because of Augusta there is supernatural elements in this story but it if ends up being something like that, where Lacey is now a supernatural being, it just becomes a very easy copout from a story he wasn't even going to write unless people voted for it. Plus, if she truly was a succubus and didn't truly love the MC, why would she even worry about how the MC feels for her getting pounded by every single guy that she meets, she would literally just be college Lacey all the time and never once worry about how the MC felt, because she wouldn't care, she just wants to be fed. Just my personal opinion
Because as I said previously their is a difference between romantic love and affection, Yara in Augusta clearly care, she care for the MC and Bailey, so the problem might be exclusive to romantic love, so Lacey still care about the MC, however she can't love him romantically. Maybe like I said she died before College, possibly when her father discovered she was leaving for College he beat her to death and disposed of the corpse, she was able to make it back to the human world, possibly helped by Aunt Augusta, and she went to College to try to figure out how to fake love so she could repay the debt she feel she owes to the MC, being there at his side until he die, just like he was there at her side until she died. So now she can't love him, but she care deeply for him, so she tried to pretend to be a good wife, while secretly being slutty and feeding off other men since its somewhat risky, so she is trying to corrupt him so he'll accept her as she is, it would explain what 'other self' she is talking about, like Bailey in Augusta that shifted in front of her mother from looking human to looking ghostly, the 'other self' is basically her succubus form.
I mean look the Professor is now up to 3 games, 1 completed was a supernatural story that turned into a scifi story at the last minute. Augusta has supernatural and exist within the same reality as L&J, so it would be foolish to not expect something supernatural to be involved in this story, the plot twist is likely that its a supernatural story revealed in the last Act, and justifying everything fucked up about Lacey, thus enabling the players to overcome their hate because if its revealed she is a Succubus as I theorized its going to be changing the tone of the entire game, because if Lacey is such a being it explain how she behave, she isn't human anymore, she can't love, but she can have affection and care, however she doesn't think like a human anymore, so she doesn't realize how fucked up she is acting due to her altered nature and way of thinking.