My X-assassin lover (Killua X reader)

Hello everyone this is Author~chan I am so happy to be able to make another story and if you guys want to see my other two stories make sure to go check those out and follow and so I hope you guys enjoy this story for what it is and please tell me what I can do to make it better and I will make sure to do that!
You were eight years old one day and you got home from talking a walk the first thing you saw your parents lying on the floor dead you didn't take time to realize a boy was walking towards you were too distracted with the fact that your parents were gone, you that looked at the boy he looked about your age, he offered to take you with him, and you had nowhere else so you just agreed, that's where the adventures began....