i used a save from version 14. There is no option to sleep with Zoe. I couldn't find a joint event with Zoe & Ava, unless it's hidden. There were many events that were reset, I had to replay the school events and all the Dora events.
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Can you send me your save game somehow, so I can take a look at what happened to gou. (The one you used not the one you finished) As for sleeping with Zoe I didn't mention but you need 8 affection minimum, joint event appears as a player hint once you finish both Ava and Zoe's stories, same with the park event
I don't have enough affection, but it says that I can't level them up any more in this version of thegame.There's no place in these comments to attach the save file. I uploaded it to MEGA. Here's the link. https://mega.nz/file/niAn0R6Q#dyioNIlUkODtGpZ8bOqP7kCnAzwDtCgDjRA5gUG75_Q