Alice Simpson said this quote

She can’t explain or quite understand what it is that is special about dancing with Harry. When he opens his arms to her, he is so sure, the way he holds her, not too hard, not too soft. Like coming home. Where she belongs. The way he moves her. They are a part of the music. Their bodies fit together, move like one person. Perfect. The way a man and a woman must feel, she thinks, when they are in love. He makes her feel beautiful, too, like when he assures her that someday she will be good enough to be a professional dancer. Harry must know, because he is the best dancer, the best teacher, a girl could have, patient and gentle. She is lucky that he believes in her. That is how she feels outside his door.