Dev does this all the time. Hinting around that Lauren has an eager slutty side willing to do anything. Like the club scene were she lingered watching the one girl getting plowed by multiple guys and her reaction to being asked if she liked it was to smile.Maybe I can try to answer you more completely. I think I understand your concerns and questions in a wider context.
From the beginning of the game, Lauren (mom) gives a bit of a slutty impression.
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All the time we get the impression that she is ready to jump on any cock she sees.
A purposeful dev effort that messes with the player's head. We are supposed to slowly discover the truth
and decide who to believe. Note, that Lauren doesn't quite believe her son either.
She searches through his things thinking she might find on drugs. In my opinion, the dev unnecessarily removed several scenes.
They didn't explain everything, you can still be suspicious, but they gave clues.
Not everything is as it seems. Among other, the thing you ask about.
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I don't know how far the dev has changed the storyline in the new version, I haven't played yet. Images are taken from the previous version. As you know there are (were) three paths for the MC. In each of them, Lauren (mom) behaves differently,
but in each he gives the MC deep affection.
PS: My favorite scenes in the previous version. Emotions rendered very realistically.
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Then people wonder why this discussion comes up. Stuff like that just makes it feel like the dev feels constrained and wants to do more, but is afraid to.