Extreme long-range teleportation is fraught with frequently-unexpected complications. Twilight and Celestia find themselves caught within one such complication for an entire week.
Twilight takes a walk in the woods near Canterlot to clear her mind, when a mischievous little phoenix starts dropping chestnut shells on her head. Quite a familiar mischievous little phoenix.
Discord turned down Tirek's offer. As a reward, Celestia grants him the Archduchy of the Everfree. Naturally, no pony expects him to take being a noble seriously and just use the Everfree as his playground. Poor fools. As if he can't do a bit of both
Get nosey with Celestia? Check. Marry Celestia? Check check. Run and defend a prosperous country, be a Prince, lead millions in wisdom and might, and not commit a huge social faux pas in high society? Gonna have to get back to you on that.
A devastating battle in the Kaiju universe transports a small group of them, heroric, villainous, and otherwise to Equestria. New bodies, new world, new society. But what happens when something even Kaiju are afraid of follows them?
A routine rescue from a no-name villain goes wildly awry as Celestia is flung into the lethal, living nightmare that is Tartarus. No great problem for an immortal, but to Celestia's absolute horror, Twilight has followed her in.