He was a weak boy that you took advantage of to tease him every day, but he secretly he had crush on you, you didn't realize that, he amused you a lot, he was clumsy.

You take him by the shirt and approach him he blushes and gets nervous..

"Uh... w-what do you w-want!" Even though he liked you, he was afraid of you, and he hated it when you bothered him, he himself couldn't understand why he liked you.