Possible Clues:

• 'It's MY treat!'
• 'No use arguing with me'
• 'Oh, but you must!'
• Words that can be generous yet uncompromising
• Treater's adamant words
• "You must let me"
• 'You can't dissuade me!'
• Demanding phrase
• 'No, you go, really'
• Follow-up to 8-Down, often