After a few hours to digest I'd say again Act 3 doesn't make any sense, I feel what should have happened, is that after the girl's day, when the MC goes back to the Hotel he should have been when he hallucinated what happened at the end of the chapter at that very point, than fucked off back home like he wanted to do, the 'fun' day didn't work out because the MC refused to let it be fun for him as a form of spite for what happened the previous day, it was a waste of time. So yea instead he should have hallucinated Lacey after having came back to the Hotel, left for home, than everybody rushed to pay him attention followed by that he should have begun going to therapy, started to get better, and the chapter could have ended with the reveal of Lacey's father death, simple as that.
The only two reasons it happens at the end of the Act is because this way Lacey can't be directly blamed for it happening, it happened purely because of the MC suffering a random mental breakdown, and again so it could serve as a cliffhanger hook for the next Act, its very cheap.
Next I really think what the Prof needed for this game is to create fictional magical drugs, because both Ketamine and Ex don't do what is portrayed as doing, basically the Prof wanted a drug that cause specific effects purely for narrative purpose, found some drug that could vaguely fit, and thrown those in, but realistically those drugs don't cause people to act or think the way the Prof make it out to, its clear they wanted a Deus Ex Machina magical 'do whatever the Dev need it to do' drug, but they couldn't be bothered to create them.
Finally, I had a creeping idea that popped in my mind, I thought next Act the MC would get brought back quick at the start of it, but thinking back again... the lawyer's call cause me to suspect, the next Act the MC is heading to the House for Wayward Boys, I think next Act is when the supernatural is going to kick in, he is going to end up in what could be deemed as a House of Good for the purpose of Evil, the flip side of Augusta, where he'll get corrupted, come back and now Lacey will be the one to act as moderator for him rather than the other way around, and the Act will be about him being returned to being a good boy by his girls, redeeming him with the power of love, thus making his relationships with everyone good now and making him fully willing to have a harem / big family with all his girls.
Hell I also suspect the way to Prof intend to justify the characterization by the end of the story revealing some supernatural evil being has been influencing everyone and thus caused everyone to act in ways that don't make any sense in reality for them to do so, effectively giving a massive free pass for every past misdemeanors for everyone involved in the story. Revealing this stretch back all the way to pre-College Lacey leaving the MC, because the MC is too good so the forces of evil wanted to break him and corrupt him, which was the optic all along, and the hallucination wasn't one instead it was a Succubus (because the Lacey at the end reminded me again of Yara) manipulating him into leaving so he'd head to the House for Wayward Boys.