You can also try reinforcing their good reading and commenting behavior and ignoring their bad commenting behavior. As long as they destroying stuff the ignoring works wonders. They long for attention and when you deprive them of it they stop tantruming and shut the hell up! A modified time out can also be effective. Put them somewhere with nothing else to do whatsoever, and get rid of all the apps and anything else that might be fun on their phone, leaving them with reading your story as the only option. If they get bored enough they may even read it twice giving you twice the minutes!