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Misty has girl next door energy in maybe the worst way.
Type of girl you can have a sleep over with and not overthink. Girl who's parents probably end up knowing your parents.
If she's leaning on you you don't give it a second thought. Ash and Misty are very physical and I don't think either of them associate it with romance even if they like each other.
Realistically if they started dating it could either be the best choice ever or it could completely destroy a good bond by adding complications