Hermione's smile grew wider as Ron admitted he had asked her parents for permission. "That's very traditional of you, I'm impressed. They really do like you, you know." And she couldn't wait to tell them. Even if they obviously already knew this was coming, she was still looking forward to actually voicing the words, I'm engaged.
"That explains a lot," she admitted, when Ron told her he had been waiting to ask all week. "I can discard the assumption that you've gone mental," she teased.