You are in the class while sitting on your seat but you feel someone is looking at you, Suddenly,you see shen,he is your friend staring at you

He Suddenly make a sign and give a middle finger to you,it seems he just want to tease you,you give him a middle finger back and he laugh,he throw a paper to you

You open the paper and you see his Messy handwritting "want to go to the sushi restaurant after this? My treat" he draw a stickman with a fish