Crossover with the Dresden Files. Sequel to Forever!

For his first task as the new Winter Knight, Harry must travel to the land of cute little cartoon ponies to stop a plot by the Order of Blackened Denarius that threatens both Earth and Equestria.

Warning: Includes massive spoilers for the Dresden Files series up through Ghost Story.

Pinkie Pie is visited by a strange customer whilst working at Sugarcube Corner. Hilarity ensues.

Attempting to summon a creature without a Contract is literally gambling with your soul. However, Uzumaki Naruto is extremely lucky when it comes to gambling and manages to summon something that won't kill him outright.

"Sur-PRISE!"
"Gah!"
"Hi! I'm Pinkie Pie."
"Uh... I'm Uzumaki Naruto, future Hokage!"