the prank that went too far

i'm joining the phantom troupe..." killua quietly let out. gon's eyes widened, but he quickly regained his composure.

What if, the phantom troupe weren't the ones who murdered Kurapika's clan?
What if, Killua wants to continue on as an assassin?
And what if, Gon wants him too?

In which a twisted joke, led to a very real outcome.