Letters to a person I'll never send

What is my favorite color.

You don't know me.
You know my body.
You know the things to do,
where to touch to make it all disappear.
You know how to break the walls down to get to where you want.
You know how to take your actions and get the right reaction from me.
You know where to kiss and when to do it.
You know how to look at me.
You know just how my brain ticks.
You know that if you put your hand on that one place on my ribs it'll make me recoil.
You know what to do when you want me to calm down.
You know how to make me putty in your hands.
But you don't know me.
Whats my favorite color?
Can you answer that?
What's my favorite constellation?
Why is it?
I've told you all these things.
I know all these things about you,
at least the ones you've let me know.
So just answer me this.
What is my favorite color.