Monster Within [ Killua Zoldyck x Reader ]

Killua Zoldyck. The man who went missing at the age 14. Some say he killed himself, others say he went back with his family.

The truth is. He ran into something. Even he did not know what it was. But it overtook him, and from then on, at night, he was a terrifying creature seeking vengeance. He was cursed. Possesed.

He managed to wipe out multiple towns, but after a while, Pro Hunters found him and locked him away underground, living the rest of his life trapped behind walls.

Today, a man came in and told him he had a visitor. Which was very alarming to him. He didn't want to hurt them. He was a monster now, something people fear and run from.

So why was she so nice?

Will he finally be able to see the light once more? Will he finally rid of the monster deep within?