You struggled with ADHD, and although many didn't notice, your desk mate noticed after a while

You were sitting in class, the tapping of your foot filled the room. Though, not many payed attention to it, since the teacher was giving a lecture. You felt like you were about to pop. You looked around. You turned to look next to you and saw that Leon was looking straight ahead, and put his hand in your side of the desk.. As if for you to draw on his hand "draw on my hand and stop fidgeting."