How are you?
Are you okay?
I hope so, I don't want to think that you left to a place so dangerous and sad.
I got married and have child with Sakura.
Who knew, huh?
After all these years, I got married with that pink-haired, short-tempered woman.
Hey? Didn't you like her?
Come to think of it, all of our fights when we were younger were about her.
I didn't like her at the time, but you sure did.
It was much simpler back then.
No Madara.
No Pein.
All of Team 7 together.
You.
The Hokage decided to tribute a day just for you.
October 10
"Naruto Day"
They should've picked a better name in my opinion.
Do you miss us?
I miss you.
Your blond, spicky, messy hair.
Your tanned skin with those whiskers on your face.
Everything.
All the others are moving on.
But I'm not.
I can't believe I lost you.
I can't believe that after all the things your big-mouth said wasn't proved in time.
Hokage...
"My future dream is to be the greatest Hokage, then the whole village would stop disrespecting me and treat me like I'm somebody-somebody important"
Don't worry, I'm filling your spot.
Until you come back.
But that's a hopeless dream.
So please be alright.
I'm sorry I can't join you soon.
I still have a village to protect,
as well as your promises.
I wish you were here.
Naruto
You can interpret it has a friend relationship or romantic. I don't care. I just wrote this imagining Sasuke's reaction to Naruto's death and tells him what's he's missing, but in a letter and starts to remember the past and breaks his guard more and more.