Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot by Dav Pilkey
George and Harold, and their doubles, Yesterday George and Yesterday Harold, have a good thing going. Two of them go to school, while the other two hide in the tree house and play video games all day -- then they switch But when their malicious gym teacher, Mr. Meaner, creates a method of mind control that turns their fellow students into attentive, obedient, "perfect" children, the future of all humanity will be in their hands.
But happily, George and Harold, and Yesterday George and Yesterday Harold have a time machine. And they go 20 years into the future for help... from their grown-up selves!
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My thanks to Yapha for the heads up on this awesome gay twist!