The Missing Boy (Killugon)

Years ago, one of the Zoldyck children disappeared. The heir. Nobody knows what happened to him. Years later he appears but nobody knows if he's actually the missing boy. Gon and some of his friends find him and ask about him, but he doesn't remember anything from before he disappeared. Not even his real name. And he seems to have acquired a mysterious power. Gon ends up falling for him while he's trying to figure out where he belongs. The boy gets visions though and tries to stop them from sending him home or back to where he came. He sees them both as bad news and doesn't want to go back to either of them.

Gon and Killua are 14 in this AU.
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OK OK KILLUA IS KINDA INSPIRED BY 11 FROM STRANGER THINGS- :')