Lie down and wait with your mouth open wide, for you are my personal toilet. Keep that toilet-mouth open and ready for when I need to relieve myself. Today, I am afflicted with a case of diarrhea, and I have liquid, foul-smelling waste just for you. Swallow it, eat it, and lick my dirty ass clean.
Use your tongue to penetrate deeper, sucking out every last bit of shit to give me pleasure. How delightful it is that I have a slave husband who is always available to receive my waste in his mouth. He is ever present, beneath my ass, waiting and willing to serve.