Bottom of a Princess
Princess Celestia was at her castle, staring at her throne. She was mentioning a cushion and a guard offering his face. The delighted princess rested her rear on his face, breaking wind, giving a lovely scent to the guard. She realized she needed to defecate and urinate. The guard offered his mouth, for which the princess used. The guard licked her anus and genitals clean. She stood up and left.