With Cheerliee acting as his pretend teacher for the day, Macintosh is roped into playing a number of childish games at school involving silly tests, arts, and diapers.
Shining Armor gets a tip that Princess Cadence had been hiding her deepest darkest secret from him for a long time, and he aims to help her come to terms with it.
Discord wants a family, but since he's too embarrassed to ask he decides instead to use the mane six as his foals. Regression and foalish antics ensue.