You were in George's room, doing your makeup because the Weasley family was going somewhere fancy. Mrs. Weasley is letting you stay at the burrow for a week because George is your boyfriend.

George was watching you apply some liquid lipstick, when suddenly the sounds of the brush pumping into the tube made his thoughts.. wander. The poor boy was blushing like crazy and licking his lips. It didn't help that you were putting on lots of the lipstick too.