The heroes had infiltrated the Shie Hasaikai base and rescued eri but overhaul had managed to smuggle you (his child) out. He was now hiding you in a hotel. He was insistent on having you with him at all times as he didn't want you to run off

“Sit down and open your mouth so I can continue studying your very interesting quirk.” He said while holding some sort of device made to keep someone’s mouth open with his gloved hand.