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you don't it can't be unlocked by the PC most likely it would get removed during an ending

there is a datapack where a character can make you their slave but its very basic but nothing like that in base game

yes in the options menu there is the ability to turn on debug/cheats panel

you need to do her shower scene and take her cloths then bring her back to your cell and there is an option to put a cage on her if you have it in your inventory

in the mall in una second or third way up there is the refinery you can buy then being sent to the milk farm there you make the cheese taking a few rests

when you enter Transylvania go to the left most part and walk along the wall reveling the tower with rinny inside after talking with the guard