PLEASE DO NOT READ IF YOU DO NOT WANT ANY SPOILERS FOR MY 2 FUTURE BOOKS THAT I HAVE PLANNED!!
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The 2 books will be Muichiro x Y/n still
The next book will be a Modern Au where you're Uzui's little sister
The Modern Au will be Titled "We Meet Again / A New Life [Muichiro x Y/n]"
Y/n and Muichiro died by Muzan near the end and promised to meet and get married in the next life that's why the title is like that
The other book will be "The Unknown Hashira" where Y/n hasn't been discovered to prove if she is a myth or not until the day of Tanjiro's trial where the myth has been solved
Muichiro will not die in "The Unknown Hashira" nor will any of the hashira's because I choose it that way.
You will also be Mitsuri's younger sister and she never knew you joined the corps or that you were the hidden hashira until tanjiro's trial.