His eyes widen and he moves his hands back and forth anxiously.

"I- I could not possibly be so familiar--" As if he wasn't just using her lap as a pillow a handful of minutes ago. And...

"...Yet, if that is what friends do?" He has to relent and admit that he needs to learn some things about being a 'friend'.

He hasn't changed how he refers to Midoriya-dono, either. Perhaps he should have after all?