Dumb little idea, but I really want to see a body-swap AU where the person wakes up and realizes something’s wrong because of the colours of things. Like looking outside to see the tree leaves look wrong. Because it is entirely possible that everyone’s perception of colour is different, but we are all taught that certain things are certain colours. So switching minds would leave the body still processing the colour, and red could be entirely different.
While I’m at it, little things like pain tolerances would be cool too. How much of the pain tolerance is mental, and how much physical? Stuff like that. I want a body swap AU that, even briefly, mentions stuff like that.