Like many siblings, Rumble and Thunderlane don't always get along. The age gap and personality differences often leads to heated arguments that leave both ponies frustrated. With the help of a mysterious book, found in the library of Twilight Sparkle's castle, Rumble takes the situation in his own hooves and devises a plan to reverse roles with his older brother.

Commission for Twinkie Hoof

(Do not continue reading if you do not approve of hypnosis, diaper usage, mental regression, or adult baby themes. If you do not like it or are under legal age, please do not keep reading.)