Demon slayer in my Au

Chapter 1 (The past) The day we meet.

I remember waking up and being in my past where my brother Giyuu found me.  I was 11 when he found me with four ribbons (one red, one purple, one blue and one pink) and a lot of blood on me.

I was running and hope that someone will...

Me- PLEASE believe me sir...

Sir- GET THE HELL OUT YOU PSYCHO.

I was crying a lot that all my clothe were wet and bloody.

Me- You mister please believe me... There was a demon and it attacked me and my sisters...  Please... Believe me...

Giyuu 💭-wait she reminded me of myself... I have to help her.

Giyuu- Don't worry i know it was a demon...

Me- Can...you...help me...

Then I fell on the dirty ground and hit myself.  When I woke up, I was somewhere that I didn't know, but I saw the same guy.  He was looking at me.

Giyuu- Hey are you okay...  I'm sorry for your loss.

Me- Don't worry, I'm fine... I think...

Giyuu- Okay !?  You lost a lot of blood...

Me- really?...  Uhm...  By the way I'm Luna... and you ?..

Giyuu- Giyuu Tomioka.  But I didn't hear your last name Luna ? Do you have one...

Me- no not really... My sisters too, but...
Where is all the ribbons !?

Giyuu- Hey stay in bed.  Don't panic they are here.

Then is saw him staring at the red ribbon.

Me- Thanks...

Giyuu- You don't have other family members that you know ?.

Me- Unfortunately no I'm the last person...

Giyuu smile and cry.  I was also crying.
10 minutes later he said :

Giyuu- Hey you know what ?

Me- what...

Giyuu- We have the same story you and me...

Me- What do you mean..?

Giyuu- No one believes you when your sisters were k!lled by a demon...

Me- Yes..

Giyuu- My sister was also k!lled by a demon and...

Me- no one believes you.

Giyuu- Yes... But I have something else to say.

Me- what is it ?

I was looking at Giyuu and saw that he stop crying.

Giyuu- I live alone and you have no place to go...

Then giyuu started whispering to himself :

Giyuu- I wish my sister was still alive...

Then he stand up and said :

Giyuu- Do you think... you can be my...

Me- I-i-i can be your sister...?  I won't be alone anymore... Are... you sure...

Giyuu- Yeah I don't see why not.  You kind of remind me of Tsutako with your long hair, your eyes and the red ribbons...

The next thing that happened was him and me crying our life.

Me- Thanks brother.

Me- So my name is now Luna Tomioka.

Giyuu- Correct.  Welcome home Luna.

2 minutes later we calm down

Giyuu- I think now you need to recover.

Me- I will, but can i ask you a question ?

Giyuu- Yes anything.

Me- Are you one of those slayer demon.?

Giyuu- Yes... I'm a hashira...

Me- That's so cool ! ouch...

Giyuu- Don't get to excited it's a difficult work...

Me- Do you think you can train me...

Giyuu- Are you sure...?

Me- Yes sure i want to be strong just like you !

Giyuu- Okay that's settle your train will be do in 2 weeks.  Just the time you need to recover.  You will train with a old friend of mine.

Me- Who ?

Giyuu- Urokodaki-san.  We will be teaching you water breathing.

Me- Okay sound good I'm really excited !

Giyuu- It will be hard, but you will be strong.