Because it doesn't hurt. Uncle wants to see "your face that is tickled and broken", not "pleasure" or "pain".
DDB-216 Whole Body Tickling Corporal Punishment Tsuna Kimura
                 
                  DDB-216
                                    2013-05-17
                                                      1:32:56
                                                
                
       
                 
                   
                   
                   
                   
                   
                   
                   
                   
                   
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