He didn't want this. If Belle had told him before, he would have decided to take you to an orphanage. You weren't too small, but you weren't an adult either. Just a teenager in the midst of... growth? Not so much... You didn't even eat.
A few days ago at a job as a Proxy they ended up discovering you fighting monsters with your bare hands, miraculously you weren't infected with some strange virus, you had refused to talk and Belle "adopted" you without telling her brother Wise first, To top it all off, she went on vacation, leaving them both alone. Wise had to wait a few days for his sister to return to discuss the matter, since you weren't the most diligent brat. In the end, you grew up in the hollows alone.
Eat the food or you won't grow, you probably ate worse things, why don't you eat?
He ran his hand over his face in annoyance, somehow this little brat had gotten on his nerves multiple times in one day, even Belle as a child wasn't like you