In terms of accessibility, for the time being:
- Maja is definitely gated by Victoria atm. You can not even advance Maja's route w/o agreeing to babysit/make a promise/agree to a date with Victoria. (Sidenote: If there is an ending where MC can end up with more than 1 girl, this Victoria/Maja/MC happy family is currently the most likely IMO.)
- Sasha may be gated by Robin. For a short period of time at least, don't think we can communicate with Sasha w/o going through Robin.
- Amber gated by Bella. This one is most interesting. As it stands now, care/affection you show Bella results in positive RP with Amber. If you treat her daughter poorly, it is unlikely you can get very far with Amber. (It could resemble a Bella/Jill BaDIK situation where Amber encourages you with her daughter but then starts to like the MC herself.) Somewhere along the line, however, I expect the script to flip for this one. Trying to bang both is likely going to result in a catastrophically bad result.
I agree. If there is anyone though, my money is on Ayua. These two are very comfortable with each other and have not displayed any possessiveness when MC spends time with the other (so far.) Ayua actually likes it if you like Bella and Bella is fine with you scheduling fight training with Ayua.