You was sitting in class, listening to Aizawas lesson.. well not really but you was there. You got bored and thought that pranking Katuski would be a good idea so you grabbed a sheet of paper, writing down "Will you date me? -Onyx" with a yes or no. You passed it over to Katsuki, not really expecting a yes sense katsuki isn't the type to date

Katsuki looked at it than wrote his awnser before placing it on your thigh, making sure that aizawa didn't see him give it back to you.