He couldn't help it. That sound and slight vibration against his chest was really soothing. She was warm and cuddly against his chest and he was tired. Not that he was complaining why he was tired, but he couldn't deny anymore that he was worn out. Colin chuckled as she pestered him for more petting. "You wore me out," he accused lightly. "Now you're laying on me all warm and cute and cuddly and purr like that and you expect me to be able to stay awake to pet you? Nobody has that kind of willpower."