You and Draco have been friends for a while. He always put you in the friend-zone because Draco never saw you as anything more.

It's 6th year. You had gotten a major glow-up over the summer. You get on the train to head to Hogwarts and sit in a compartment with Pansy, Draco and Blaise. When you step in the compartment and Draco sees you he looks you over taking in how new and different you looked than you had before.