Taken away.

"Drop the sarcasm Gon," Chrollo ordered, "It's very impolite."
"Says the one who kidnapped me."

He made his Nen skills book appear. As he opened it, the collar around Gon's neck appeared and he yanked him off the mezzanine with the rope attached to it.
He lended on his feet, Chrollo staring right through his scarlet eyes, Gon's leash still in his hand.

"I said," Chrollo started, "drop the sarcasm."

Gon gulped and sat down next to him.

"Yes, sir." He answered.

It definitely was not a great morning.

OR

The Kurta clan is still alive, but Gon, born of a Kruta mother and Ging Freecs, was kidnapped when he was seven by the Phantom troupe and Chrollo has decided to make him his pet.
Killua Zoldyck was sent as a scout to document any modification of the last few years between his father's last job regarding the troupe but gets caught in his stakeout.
As Gon helps him escape, he promises to come back for him.
Everything else unravels from there.
(I changed Kurapika's steal chain.)