"Hmmm...." The teacher watches as you slowly make a puddle on the floor before walking back to her desk, "I suppose if you really don't want to go back to the one-year-old class right away, you can stay with us for a little while."
"Th-thank you!" You cry out, trying to hide the wet spot on your pants, "I uh... I don't know what's making me do this..."
"Nuh-uh!" Cried one of the three-year-olds in the class. "Do we really need to keep him here?"
"Yeah!" Piped up another classmate, "Send him back to the diaper class! He won't understand what we do here."
"Now class, be nice." The teacher was now digging in her desk for something. "You could learn a lot with Timmy here."
"Y-Yeah," you say, smiling a bit. Finally, someone was giving you the respect you deserved as an 18-year-old.
From her desk, the teacher drew out a large white diaper and bottle of baby powder, "For starters you could learn to change a diaper."
"WHAT?!"
Within moments the teacher had pulled your wet pants and boxers off, followed by your shirt. You were lying naked on the floor as all the three-year-olds giggled and pointed.
"We needed a learning aid for these kids but couldn't get one," explained the teacher as she powdered your butt. "Now class, pay attention in case you have kids one day."
The teacher finished up and you sat there on the floor, wearing a thick white diaper.
"Now then," the Teacher stood up, talking to the class, "Now that we've got Timmy dressed appropriately and that he can't make another puddle, what should we learn first?"