He got hit by a spell that gives him the ability to read minds. Almost all day, he hears Pansy thinking about Hermione, Blaise thinking about Ron. He havent read your mind yet. So he came to you as you were partners in a class.

"Hey, Potter. Whatcha thinkin'?" He said as he smirked, as he reada your mind. You sighed and blush as you were thinking about him. That made him blush. "Nevermind." He said as he continues to do the work that the professor had given you and Draco to work on.