One warm summer evening finds Celestia alone. Her marefriend has gone with her friends to Haytona Beach. Her sister is enamored in her games. Her adopted niece and nephew-in-law are enjoying their second honeymoon. This leaves Celestia lonely, bored, and in heat season, nopony to screw. To calm down, she orders a large amount of cake brought up.

While eating, she discovers a special cake, one that may sate her needs.

(This idea came about during a comment conversation with my friend Party Pop)