Hunter x family

Killua sighed, swinging his legs. I can't believe this is what my life's come to. He scowled down at his short stubby legs. "So, how old are you?" the black haired woman who was standing in front of him asked. It was embarrassing to answer. "Seven" He despised how high and squeaky his voice got, and how people kept crooning over him and looking at him like he was some kind of adorable kitten. However it was necessary for the mission. Bisky and another Nen user had worked together to reverse age him. Not just his appearance, his entire being. He was left with his fourteen year old brain, in his seven year old body.