Kaito knew you liked to suck your thumb whenever you regressed. It was just a comforting habit you always gave into. You saw no harm in it, but Kaito saw different. He didnt like how you would bite on your fingers or how many germs you were probably putting in your mouth. He wanted you to use a pacifier instead, seeing it as a safer alternative.

"Little one? Could you try putting this in your mouth?" Kaito asked as he recognized you were sucking on your thumb again. He held out a pacifier big enough for your mouth, hoping you would take it. You didnt like having to use pacifiers, so immediately turned him down.

"Look, Im worried about your thumb sucking habit. Its not good for you, bubs. I dont want you to suck on your thumb anymore. If you want to suck or bite on something, use your pacifier, okay?" Kaito said firmly, yet kept his tone soft enough to let you know you werent in trouble for this.