one day Tanjiro and Giyyu were kissing in the frozen ice castle Azaka made when they heard a noise outside

"YOUR FOURTH WIFE"

it sounded like there old friend Rengoku but they could have sworn he died right in front of their eyes quite some time ago they walked into their Elsa balcony and looked down only to see Lord Tengan on his knees by Rengoku holding something in his hand, a box? yes a box and inside was a doughnut.

"WELL BUDDY I CANT SAY NO"

Tengan passed the doughnut to Rengoku witch he gobbled down in less than a second.

"UMAI! TASTY!"

Tanjiro turned to Giyyu

"could that be us one day"

then suddenly Giyyu got on one knee and opened a box

"well I am a real Rizzler"

"OMG! yes Giyyu I will marry you" Tanjiro squeaked

suddenly Muichio walked in

"omg Tanjiro girly I'm so happy for you"

and they all lived happily ever after and Muichio did not get married to any weird simps, Emily kocho or anyone because he he 14 buddy