Killua x female reader: Assassin's Bride

This story will be written in first person.
It was sudden but all assasins targets you. Almost everywhere, are also assasins. Suddenly when you were about to be killed a silver white hair boy protects you saying, "I'll protect you until I die. It's a promise." What does he mean? Why? Who is he? "Because, you are my bride." He said with such confidence and so, your journey with him starts. Find out more about the power inside you as your journey with him starts.

I don't own HunterXHunter and I don't own the cover art
I only own characters and storyline that I make.

LEMON involved if you're patient enough to wait until the end( or if you skip right to it)