Midoriya will be too shy to shout "I like you" in Nensu's face. It'll take some time for him to gain confidence about it. Probably he'll gain some as he grows in other ways too.

Hiems has a slight grasp of what might happen(probably, who knows what is going on in his mind with his empty stare) but he won't go straight at her and say it unless she corners him with a baseball bat in her hand.