Grandmas like to cook, and like to make sure everyone is well fed.  But they usually are not into purposely trying to fatten people up.  Feederism is a sexual kink, and I don't think wanting your grandmother to participate, especially playing with your fat, is a good idea. Let her fatten you up, but find someone your age to enjoy the results.
      
      
    7 years
      
       
                      