Hermione watched him struggle; she could, of course, make it easier for him, but that's what she'd been doing for both he and Harry for five years and that didn't help anyone in the end.
But his expression, as always, melted her - he was such a big dope after all, and she had realised over that long summer, that that was one of the things that most endeared him to her - he wasn't smooth, he wasn't cocky and sure of himself.
She squeezed his hand gently. "I would love to go to the dance with you ... and you didn't ruin anything. No one is great at asking someone else out, let alone a friend."
She gave him a sweet smile. "I'll even transfigure those ...interesting robes of yours into something new, if you want."