Draco Malfoy entered the slytherin dormitories, seeing you slumped on the couch in front of the fireplace. You were reading a book, (you can choose which book) he walked over to his bed, and you look up at him and just look back at the book. He notices and gets quite jealous. He wanted to be with you right now. He wanted to be the one you look at interestingly. He wanted you to notice him, he wanted attention. He quickly snapped out of it, he's basically your enemy, he shouldn't be feeling this way about you.