Thanks for the info, as always, but seriously, don't get into trouble spoiling about things that rather sees the light next year!
Let us here rather speculate for entertainment meanwhile.
DLC girls sounds good that are most likely not part of the main story but still get enough attention with typical side quests and general activity like anyone else.
The list of possible candidates is pretty long as far as I have once checked:
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Chapter 5 and 6 girls sounds like 4-5 years in the future, but as already mentioned somewhere here, if the basic stuff is completed, everything else should hopefully get released faster. Can't wait for all this.
1: how do i increase friendship between Jean and the other girls?
2: while i have a hotkey for the remote vibrator, i can't seem to interact with the remote..how is this supposed to work?
1. Attending class with the girls is generally better than the pool. See here:
https://f95zone.to/threads/the-null-hypothesis-v0-5b-ron-chon.138294/post-14347499
You only have to msg them all to come to your current location when in class. After a while, this shouldn't take so much time clicking rapidly through the phone options.
2. AFAIR you have make the girls wear the vibrator in the wardrobe menu at first. Then you can toy around with its remote in the phone menu. It takes a while until it affects the girls, but I haven't tested this much yet.