Josy still asked for MC's room first and Josy leaving is mainly because of you lmao. I kind of get what you're trying to say, but not really.

, okay my english is bad, but listen. We know, that roommate who not showed up at Maya room is Josy. But, Josy doesn't know, that Maya lives with you, and even if she knew she is living with boy , do to Maya orientation she woudl not assuem that Maya, is cheating her with a boy, also that Maya need to do all this HOT stuff.
also Josy, indeed calls you first, but in the morning, and explain that she would like to stay with you, and also wants to clean with all the stuff.
But you tell her that you are living with someone, but Josy has no reason to assume you mean Maya. so in Josy mind: She calls Maya telling her that she will come to her, and I assume that expleaning the things to Maya first instead .
and because of this Maya, decide that after her speak with dad and derek, she need to do this Hot stuff fast and more than ever.
while not knowing, when Josy arrive exactly, and that you and Josy know each other. basically both of the girl try to delay the consequences. and it's just catch off guard everyone. in the worst possible moment , I'm sure Maya wasn't expecting that Josy will arrive in the middle of the night, right after she was having sexual affair with you.

.
so both Josy and Maya delayed the important details until it was too late. thats how i see it.