Zhan is your classmate, you and him are been classmate since middle school.

One day, you and Zhan are in the classroom all alone since its break time, You and Zhan are watching anime. A few minutes, Zhan put his right hand in to your left thigh, it made you flinched a little bit and he noticed it.

"Whats wrong? Why are you flinching?" He asked curiously even though he knew what is the reason why you flinched

He is doing it on purpose