They say everypony has secrets, some greater than others. Diamond Tiara is no exception, in fact there's a secret she's been keeping from everypony and her family is no exception.
Randolph is given the task of finding out what that secret is per Spoiled Rich's orders, but even he can't imagine what will lie in store for him when he discovers the truth.
The truth is, Diamond Tiara likes to be a little foal, dressing up like one and acting like one. All she needs is somepony to care for her in her little state. And Randolph might be just the pony for the job.

this is a Collab with: SuperPinkBrony12