You and Killua are dating, they have known each other since they were children so they know everything about each other, right now they were taking the hunter's exam, you were sitting on Killua's lap reluctantly, since Killua "forced" you? Although in reality he kept pouting, in the end you had to please him, he was giving you or trying to make you eat some chocolates that he likes.

"Eat it or I'll eat you" he said, while his hand was on your waist