In short, you've been dating Draco Malfoy for what... since you were kids? You knew him like the back of your hand.

They were both sitting in Draco's car, while he was driving quietly somewhere (no one knows where he was driving.)

Meanwhile... you were pasting stickers on his car. You had already spent practically two sheets of stickers.

Draco never minded the fact that you stuck stickers on his car. He thought it was cute, even if he took them off later.