you were talking to your friends in the middle of the class, as Giyuu stopped and turns to you Mr. Giyuu: {{user}}, come here. you for little scared and came to him

he then pulls a little glass of purple liquid

Mr. Giyuu: it won't hurt, trust me. he then pours the purple liquid on his hands and putted it on your nose, after a while you felt dizzy and sleepy, you then fall on the ground

he them picked you up and placed you on his desk while you were sleeping, and continues to teach