So i decided to replay the western section again and at the scene with Dalia, one gets the option to penetrate her, obviously i didn't choose it but got curious and went looking at the game script, i can definetly say that's obviously it's the worst possible choice one can make. not only did she specifically told you she wasn't going to have sex, but doing so anyway is RAPE! It even registers in the game as such:
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And there's one thing i'm sure will happen with this variable being True, the MC is screwed, and not just losing Dalia, but this will definetly have serious and catastrophic consequences to all LIs.
Doing this to Dalia will absolutely destroy all trust Nancy and Penny had on him (i mean seriously, would you trust someone who raped your daughter/sister?), and Alex,Luna and Nova will find out about it soon after.
There's just no way of one getting out of this situation.