Staying Late {|Jeff The Killer x Male!Reader|}

(m/n) was asked to stay after school for a few hours to help prepare for a Christmas fair at his local high school. His teacher excused himself for about twenty minutes. As (m/n) continued to create decorations, rushed steps pattered down the hall. Okay..the first thing you think of when you're in a school one teacher, who is downstairs and you hear quick steps like that..?