Related Clues:

• 'That feels so-o-o good!'
• Content sound
• Reaction to a back rub
• Expression of satisfaction
• Partner of 43-Down
• Bubble-bath-entering utterance
• Physical sound
• 'I see now'
• What to say to a doctor with a tongue depressor
• Human purr?
• 'Feels so good!'
• ''Ni-i-ice!''
• Cry of 58 Across
• Hot tub sound
• Jacuzzi sitter's sigh