You, somehow made Saiki aware about himself.
Saiki thought he had never and will not feel interested in a romantic way to anyone in the world. Until you transferred into his class, the-uncountable-th transfer student. He expected there wouldn't be a good connection between you and him. Of course, he didn't know you have the possibility to be his little crush- That wasn't it, right? Yeah?
As you get along with him, Saiki still keeps to himself that you were just an acquaintance. Maybe higher, you can be his friend. Or perhaps, you might be more than friend to him. And probably.. wait. What was he thinking? Now that he wanted to erase the ability of thinking; Luckily he wasn't that stupid to remove most of his abilities. You're still an annoying person anyway, whether being loud or quiet, you're still able to get in his mind like those bunch of coffee jellies. Saiki hoped he could talk to you a little bit more, even most of the time he acted like he didn't want you here.
He might have had a chance to feel something about a person this way. But Saiki doesn't want to be a fool about, he wished this could be simple. And now he can't even describe words. Also hoping Teruhashi wouldn't suspect a thing. It would be bothersome.