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Not gonna lie , had a dream where Yoriichi managed to capture muzan the first time in the sengoku period and sort of kept him around in order to try to turn him into a human.
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In the au he's sort of like nezuko (like small in order to conserve energy and stuff). In order to not get killed he reluctantly goes along with Yoriichi's plan despite not wanting to be human again because he's afraid that'd his weak body would return.
Kokoshibou was also there lol. But mostly to carry the box they kept muzan in.
There was this cute scene of muzan with oversized clothing and an a sunhat trying to see if it could withstand the sun. He didn't go through with the plan though, so he stuck with this box.
(for some reason they were in tanjiro's time period, so it must of been a time travel au ... So modern-ish muzan is there too and tanjiro's confused because he can sense two people with the same smell).
It was a cute dream. Tiny muzan kept arguing with Yoriichi about what he can or cannot eat (despite hiding further away from him).
I don't think this muzan would wear a muzzle since I believe he can control himself pretty well , though Yoriichi keeps a muzzle on hand in case of emergencies.