Celestia and Luna enjoy sweets like any other pony. However, unknown to all but the sisters, one kind of dessert satisfies the royal tongue: chocolate pudding crafted by a legendary patissier. The sisters take turns in savoring every cup to reward themselves for a job well done. The conditions were clear: just one cup per shift.

But when a distraught Luna discovered that the sisters' weekly stash had been wiped clean, she pinned her sister for betraying her trust. Knowing well that her sister is adamant about demanding her daily cup of chocolaty goodness, Celestia summons Twilight to hunt down the pudding purger.

As if Equestrian summer isn't harsh enough, Ponyville enters a state of emergency. All the water collected from the rainfall yesterday suddenly vanished, denying the town of its only sources of water. With water important to a pony's daily life, the Mayor calls in Twilight to investigate the matter before the locals grow restless. If the complexity of the case won't hinder her, the unrelenting heat probably will.