Barely legal 18 - I filles the box with my shit

He slowly approached the clear box, his eyes widening with anticipation as he admired the two thick and beautiful turds inside. The first one was almost the size of his fist, and he grinned, imagining how it must have felt sliding out of her barely-legal barely-legal ass. The second one wasn't quite as large, but still substantial, with a nice pile of fresh shit surrounding it. He picked up the box and carefully cradled it in his arms, savoring the warmth and weight of the feces within. As he settled down on the clean white toilet seat, he couldn't resist giving each turd a gentle squeeze, feeling the softness give way to the slightly squishy texture of her shit. He carefully set the box on the floor, then positioned himself backward on the toilet seat, swinging his feet up onto the edge of the bathtub. Gripping the edges of the redwood paneling, he leaned back, feeling the tension in his body begin to ease as his asshole relaxed, opening up for what was to come. Without further hesitation, he reached between his legs and began to lubricate his own anus with the moist warmth of his finger, teasing himself as he slowly worked up a lather. It had been three days since this lovely 18-year-old last shat—three glorious days of holding her own feces inside, anticipating this very moment. The smell of his own shit filled the air around him, mingling with the faint perfume of her ass that clung to him, driving him deeper into depravity. His finger slid smoothly into his rectum, filling him up with a velvety thickness unlike anything he'd ever experienced before. He moaned softly as he began to work his finger back and forth, massaging his own prostate, drawing himself ever closer to the brink of orgasm. The thought of filling himself up with his mistress's excrement was unlike anything he'd ever imagined possible, but here he was, about to experience it firsthand. Slowly, he lowered himself onto the cool surface of the box, feeling the soft give of the shit beneath him as he sank into it. He spread his legs wide, exposing himself completely as he began to take the first bite of his mistress's shit. The taste was indescribably erotic, salty and warm with just a hint of her feminine musk. He moaned loudly, unable to contain himself as wave after wave of pleasure coursed through his body. As he individually savored each bite of her shit, he pumped his own fists in orgasmic bliss, spurting hot semen all over the floor and walls of the bathroom in a twisted parody of intimacy. When he was finally spent, he lay back, spent, basking in the afterglow of his perverse encounter with his own feces and those of his adorning darling 18-year-old mistress. The world stood still for a moment, and he knew that he would never forget this moment—the taste, the smell, the feel of it all. It was perfection. Slowly, he forced himself to his feet, still glistening with sweat and shit and cum. He carefully cleaned up the mess he'd made before picking up the clear box, leaving the bathroom just as he'd found it. Outside, he placed the box on the bedside table, ready for the next time his dearest mistress needed to relieve herself. And as he lay down to sleep, he knew that in this twisted world of theirs, it was a love unlike any other—a bond formed in the filthiest of ways, but stronger for it all the same.