Haha, that was cute. :) I liked the conversation between Harry and Ginny, how Harry kissed her like a brother. When he got serious and asked her if she was wearing glitter, you did a very good job expressing that moment, movement, and mood. Very good job.
I don't understand how the glitter got out though. This part: Harry raised a hand and placed a mask of shock as he up capped the glitter and muttered a spell tapping the vial with his wand. A moment later Snape yelped as glitter appeared on his face.
I don't understand how that works. It seems like Snape is looking at Harry, Harry raises a hand.. no clue why,which is holding two vials of glitter. Hand still raised high, he puts a cap on it and then touches it with his wand. Glitter appears on Snape's face. Yet he doesn't know who did it?
It's a very cute story, but a little confusing. :)