With most RPGM games you just need to copy and paste your current save's folder into the new version's directory (in the equivalent location it was in the previous version)
Have you guys checked the
OP? It has a link to the saves organized and shared by yours truly
Take a look
here, not sure if it'll work since I did that around version 0.86. But DO READ THE WARNINGS and preferably just do that to enjoy the content, then revert the changes back to normal. You'll just need a different save editor, the one I linked in that post has gone offline (I don't know of any online ones that allows for switch changing, do tell me if you know some)
Not yet implemented. You can see a scene insinuating she's intrigued about MC and Maria fucking, that's all
Don't recall that part exatcly but I do remember that on early stages of the game (where you seem to be), sometimes you had to sleep for the quests to progress and the game didn't tell you that. However, as someone else pointed, check school quets (and actually, all other ones)
Yes you are done
Some day. I hope