"Remember, you're a princess. And a princess always pays her debts."

Her father had said those words. It had been centuries ago, millennia, even. And yet, they still rang true. Luna, her beloved sister, had given her the most amazing of experiences last night. What kind of princess would Celestia be if she didn't pay Luna back for that?

Outlined by The Abyss

~~~

Warning: Herein, you shall find copious amounts of incestuous lesbian horse sex. This story is not recommended for individuals under the age of 16, or women who are nursing, pregnant, or may become pregnant. For some people, reading this story may cause irregular heartbeat and/or a spontaneous release of endorphins followed by a sticky mess under one's desk. If you experience an erection or other form of heightened arousal lasting more than four hours, please visit your local doctor, Pornhub office, or another one of my stories.