Note-If scat bothers you don't read. However, if you want to know what happened the morning after, please read.
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I woke up with my limp cock still inside my Sister. My hands were around her waist.
"Morning," she grinned and kissed me.
"Hi," I whispered. "I suppose we ought to take a shower." I got off my sister and helped her up. Without putting anything on, I walked across the hall to the bathroom.
My sister was right behind me, and shut the door behind her. "I need to take a shit."
That was my cue. I got on my back and my sister squatted over my face.
"Lick my asshole, bro."
Positioning my mouth around her hole, I stuck out my tongue.
"Oh, yeah, lick my nasty hole." She hissed as I twirled my tongue in a full circle on her shithole. "Ready, UMPH!"
A loud fart emerged in my mouth. It was rancid, but the depravity of this act turned me on like nothing else. Wanting to see the log as it fell from my sister, I lowered my head to the floor.
"UMPH," she grunted, as a tip of her shit emerged. I could tell that it was going to be a thick and firm one. "UMPH," my sister grunted with more enthusiasm. "UMPHHH!!" Another 3. "ARG!!" Finally her shit dropped on the my cheek. It was slightly dark. My lovely sibling turned around to admire her offering. She was as turned on by her logs as I was. She didn't ask me to lick her ass.
Must have been a clean shit, I thought. I got up and her turd fell to the floor.