Uncomfortable sitting

Today, my class and I were writing thank you notes and one of the staff subs were working with another student on the computer that I was next. The sub decided that he wanted to put his butt in my face and you could tell that I was totally not comfortable with the way he was doing that. I wanted to yell at him and tell him to move his butt out of my face. But I didn’t I could have said “please could you move your butt out of my face, I am starting to get uncomfortable with that.”