Dinah looked over at the doughnuts with surprise, trying to figure out what they were for. Then again, this was Harry after all. She knew there was a lot that she didn't know when it came to his brand of magic. After all, she never ceased to be amazed at what he could do with a little bit of hair and a few other simple ingredients, or with any other various combination of normal household ingredients.
So, when he asked her to plug her ears, she did as she was told without argument or question. She returned the smile to show him that she was fine with it, and then waited for... whatever bit of magic he was going to work with those doughnuts to be completed.