Warning: involves lots of filthy solo scat play. Read at your own risk.
...
It had been building in me all day... I could feel the edges of the big, hard log of poo rubbing up against the lining of my bowels and pressing against my sphincter, pleasantly massaging it. It was making me really horny.
I neglected going to the bathroom for a while. I wanted to savor it, to feel it inside me until I was dripping wet and could really do something with it.
So I held it in, and every once in a while during the afternoon, it would make an attempt to exit, and I'd clench and my face would turn pink while I struggled to hold it in. A little fart would slip loose and I'd almost lose it... almost. But in the end, I managed to keep it under control.
I made it until sundown. When I got home, my family wasn't there, gone on a trip for a couple of days. I relished having the house to myself. I could turn the music up loud, dance around, go places I normally avoided... like the master bedroom bathroom, for instance.
The master bathroom was extremely luxurious and squeaky clean, boasting decadent mirrors and draperies on the windows, gold sink handles, and a beautiful tile floor. The bath tub was like a spa, big enough for two to fit comfortably, no doubt designed for some hot romancing when the children were away. Decorating the edge of the spa, a large array of bath oils, scents and beads waited to tempt the user into taking a long, hot soak.
Normally I never entered the bedroom, much less the bathroom, but with the masters of the bedroom gone, it was open to my use... as long as I left no trace.
So I undressed and put on a bathrobe, then grabbed my bag of toiletries and headed upstairs to that holy sanctum.
I entered, and it was like a different plane of existence. Immediately, I turned on the water to hot and began to fill the tub, pouring fragrant lavender beads into the running water, followed by bubbles. As the tub filled, my bowels lurched, reminding me of my original purpose.
Clenching my gut in anticipation, I reached into my bag and grabbed my dildo, fastening it with its suction to the perfectly suited tile that the tub was situated in. Then I took my robe off, savoring the sight of my naked body in the mirror, and turned toward the long, hard phallus that awaited me.