DPC once said, characters are evolving. He used Maya and Jade as examples of characters that go in to a direction that he did not anticipated. Most of the things with Josy, as you can see Neutral is enough. But she does respond some of the Dik conversation quite well. Bella for example, gives alway minus, always minus in every single dik remark . Maya gives you minus if you peeking , Josy opens her leg for better view.
And another interesting thing is, Once you enter the Relationship With Josy and Maya, and your affinity falls from neutral, to Dik, you still gain all the RP point with Josy, But you dont get the Bonus options with Maya in episode 7 , Both the Hug, and the bonus Sex position, Demand Chick Affinity.
Maya is clearly the Chick Affinity girl. And I think Maya and Josy Together are the Neutral/Chick combo. and don't forget that Josy is together with Maya even in the first episode. So, What I'm saying is that Josy Affinity is depend on Maya. This is Why the Neutral works for both girl, but Chick status, and Affinity, only benefits with Maya, its clear bonus in more then one case. At least 3 Time.
If or When , Josy and Maya will break up, We could possible see a different rules for Josy, because She no longer connected to Maya, Her status, her affinity her likes, are all effect because Maya and Josy are combined Data.
I can'T explain it better unfortunately
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We will see if I'm right or Wrong, but there is nothing in the game that is ruled out this possibility, so far.