It is obvious now that the author did not intend what I saw in the first version, but for me all the dots there connected in the ending scene and I thought that it will be one of those games with a little deeper plot than just everyone fucking each other.
My crackpot theory was that he loved his sisters and made a move towards Natalie, but was harshly rejected, or told her something about his feelings towards some other sister and was ridiculed, that is why they are so hostile towards each other. Then he became gradually more and more depressed and moved further away from his other sisters so the experience would not repeat itself. Even the only sister he opened up to about his plans about army, Audrey, betrayed him so he had no remorse to go and fuck a random girl, Victoria, just to feel something. He told Victoria that he feels nothing towards his sisters because he did not want to think about his traumatic experiences or even was afraid that she will ridicule him like Natalie did. At the same time, Audrey, while being secretly in love with him, saw that he responded harshly to her attempt to fix the situation by talking to Natalie and became desperate herself, seeing that she will not get closer to him, decided to end it, going to get a boyfriend and forget about her brother in the same way he wanted to go to army, that is why she went to Victoria to learn about sex and showed almost no hesitation to even get fucked there, because it will burn the bridges and put an end to trying to get along with her brother (and Victoria knew about their desperate situation and wanted to stop them both from self-destruction) and the last scene when Audrey finds out that it is her brother, it is a dramatic turn that will give them hope and will gradually fix their family.
And the second version is just Victoria fucking the main character, no seemingly sudden turn in Audrey's behavior, no drama, no shocking revealing of a necklace, just cringey "look, it's his neck, look closer, look again, there is a necklace, got it? on his neck, just here, a necklace, still did not got it?" without any obvious plot meaning of this reveal now.
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