[He knows he's bad at this. Shouto might be new to it, but at least he's capable of opening up. One perceived doubt and Katsuki runs without hesitation. He's quicker to punch someone than kiss them. So it blows his mind that Shouto would still want this.

But Katsuki is selfish and he goes after what, or in this case who, he wants. Which is why he's more than content to stay there, squeezing his hand.]

Aizawa-sensei is too independent. He might be a teacher for our school but he doesn't strike me as having the patience to deal with all of the bullshit of a centuries old fake organization.