Demon or Demon Slayer...? (KNY X OC)

This is a WattPad Book, stop stealing it (To all story stealers)
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What if instead of only Tanjiro's sister turning into a demon, both Nezuko and Elina got turned into demons?
Will he be able to turn both of them back to a human?
Or will he find something very unusual from one of them on the way to slaughter Muzan?
Join Kamado Tanjiro, Kamado Nezuko and Miyazaki Elina on their way for revenge, meeting helpful people and much more from their pasts.

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Okay, "The fate of our lives" book was time consuming, considering it has to follow mlb series and I already lost interest in that show. But that book was kind of good in my opinion.

So this book will show an OC which will not be any different from my BNHA one except for the eyes and last name. Again, you can read it as an xreader too.
Hope you'll enjoy this~