How to Kill, Kil (KilluaxReader)

The Letter

Your apart of a very strong, important, and rich assassin family. You have 5 other siblings and are the youngest of them all. Your parents have very high hopes for you, however, you haven't proved yourself to them yet.

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"Y/N, we're going to the assassins' gala tonight, the Zoldycks will be there to." Your mom said to you.

"Okay Mom, what time is it." You asked bored.

"It starts at 8, you need to look your best. Killua will be there... Isn't he cute." Your mom said excitingly.

"...Uh no not really." You walked away and went up into your room.

After the shower you took you started to brush your hair in the mirror.
You heard a knock on the window. You walked over to the window and looked around outside, no one was there.

What the- who was that?

You looked down and saw a letter.

____________________________________

Y/N L/N
                I have a job for you, it will pay 100,000,000 jenny if you complete it.
I have offered this job to 4 other assassins and whoever completes it first will get the money.

I need you to kill Killua Zoldyck as soon as possible.

Once you've completed this job I will know, and I will send the money to you anonymously.

If you do not succeed that is fine, but if all of the assassins don't succeed I will kill you all.
___________________________________

You read the letter again and again. Kill Killua.

I have never been very close to Killua, but I could never kill him. I don't think I can accept this job.

You were about to throw the letter away and forget about it until your mom had opened your door.

She took the note and read the letter thoroughly, then walked with it downstairs.

"Y/N, you have to take this job. This is how you will prove yourself." Your dad said.
Your mouth fell open, your dad always really liked the Zoldycks. Killing Killua would definitely have consequences for everyone's relationship with the Zoldycks. They would hate us, it'd probably start a war or something. You can't do the job.
"I can't do it."
Your parents looked mad.

"But Y/N the money, it would be all yours. This is the only way to prove yourself, if your strong or not to be in this family." Your mom tried to convince you.

"You have to do it. No excuses you'll do it tonight at the gala. If you don't you won't be apart if this family. Doing your duty no matter what is the number one rule. Work always comes first no matter what Y/N!" Your Dad scolded.

"I- But" You hesitated.

"No buts you will do it tonight." Your mom said.

I don't know how I will pull this off. Killua is one of the best assassins of this generation, he's highly skilled and I'm mediocre.
Killua may not be the nicest but we're still friends, maybe not close at all but how can I kill him.
We're both are 15 and have known each other for a while.
I cant kill him.