Demon slayer Deku

prologue

We start this story with a baby crying in the woods on a winter day he had silver eyes and Hunafuda earrings.

TANJURO POV
When I was walking in the woods to deliver some coal to the villagers I heard crying I then followed where the sound was. I spent 10 minutes following the sound and then I found it it was a baby with the same earrings as me then I saw something
Tanjuro- what is this ( its a peice of paper)
I then read it
Dear anyone
Please take care of this child he is the last member of Yoriichi Tsugikuni bloodline. His name is Izuku please take care of him but if you do please train him so he can be strong and if your a member of the Kamado family please teach him the Sun breathing. Cause it is his right.
I thought for awhile the I decide to take him because I know where our family dance of the fire God came from. I put the coal down and grabed the child
Tanjuro- so Izuku how will you like to live with me and my wife ( this is a year before tanjiro is born)
Izuku just smiled and laughed so i took that as a yes.  I then I made my way home. When I got there my wife ran out
Wife- honey who is this baby
I then explained what has happened
Wife- ok I will treat him like my own
2 months later
Izuku already started to say his first word it was " father" I couldn't believe it and not only that I found out my wife is pregnant. I cant wait to see what happens next
7 months later
Izuku started talking and walking at the third month and sence then I've been teaching him how to do the sun breathing along with sword techniques but the thing I learned was not to underestimate him he may look weak but he is very strong but not that strong.
1 month later
My wife is giving birth to twins ( this is my AU so I'm going to say nezuko and tanjiro are twins) they were both girl but I saw izuku eyes lit up with happiness.
2 months later
Izuku has been playing with his siblings and I told him that he will be the family heir
9 years later
Over these years izuku has gotten better with the sword and has mastered sun breathing to a extent he even learned another style called moon style. I also bad other kids a d told him about his family and how demons are and I'm been on my death bed
Tanjuro- izuku come here will you
Izuku then come to the door
Izuku- yes father
Tanjuro- I am about to die the doctor said I have 1 day left so -
Izuku- what do you mean please I cant 
Before he can finish i started talking again
Tanjuro- please take care of your siblings and your mother will you now let me rest
Izuku bows and says " yes father" then walks out
Izuku POV
It has been a day and mom just freaked out because dad had passed we are at the funeral right now
Then it was my turn to speak
Izuku- I'll miss you father even thought I'm not your biological son you treated me like I was I'll always be thankful for that thank you dad
8 years later
I want into the coal mine to get some coal with my sister tanjra ( female tanjiro)
I'm 19 and she is 18 she volunteered to help me get all the coal we can
Everything else goes to cannon up to the point when they went home
When we were walking we both smelled the same thing
Tanjra and izuku- blood

And I'm done how was it