Eight years ago... (Killuaxreader)

You meet the long lost assassin you knew as a three year old. Eleven years pass and you are both now fourteen. You met for a couple minutes when you were six and it made you scared of him. The universe seems to force you both to hang out until you both like it, Killua originally wants to, but you act reluctant as every time you see him, a glimpse of the drastic memory eight years ago occurs. You both slowly get attracted to each other and go on from there.