Cup of tea?' Lupin said, looking around for his kettle. 'I was just thinking of making one.'
'All right,' said Harry, awkwardly.
Lupin tapped the kettle with his wand and a blast of steam issued suddenly from the spout.
'Sit down,' said Lupin, taking the lid off a dusty tin. 'I've only got teabags, I'm afraid-but I daresay you've had enough of tea leaves?'
Harry looked at him. Lupin's eyes were twinkling.
'How did you know that?' Harry asked.
'Professor McGonagall told me,' said Lupin, passing Harry a chipped mug of tea. 'You're not worried, are you?

Author: J.K. Rowling