Disclaimer: You really think that?
Draco always looked emotionless. And on the rare occasions where he didn't, his face was always occupied by a smirk.
Harry hated that.
He wanted to make Draco smile, because he knew how wonderful he would look doing it. He wanted to make him laugh, and make him happy. Harry knew how awfully romantic and sappy that sounded.
And he did.
He was one of the few people who could put other things than a smirk or a sneer on the Malfoy's face.
And Draco loved him for it.