Killua just can't have a happy ending

'Blood. I smell blood. That's not good, I promised I wouldn't kill. I feel sick. Everything's dizzy. Did I actually kill someone? Why can't I remember? Is Gon okay?'

Killua finally moves to see what had happened. He wished he hadn't, the sight would have him emptying his guts for the rest of the day. Illumi's hand on his shoulder and forehead did not help.

Across the room, was the one thing he never wanted to see. Gon Freecss was dead. And it was his fault.

Or, AU in which Illumi gets Killua to kill Gon after Greed Island and Killua goes back to Kukuroo Mountain with Illumi to continue his assassin training. But, things get messed up when Killua kills a Shinobi and is caught by Kakashi.

(Not my cover art)

Also I apologize for the shit quality of this. I mostly write this when I'm about to go to sleep