Staring longingly into the nasty, turd-gushing hole of the large beastman, you can't help but begin to notice another familiar urge. The desire to eat your heart out. Your stomach growls, and the now-pleasing, somewhat alluring scent of Davis' poop forces you to become hypnotized by it. Looking back at you, Davis can only smile worryingly. "D-Did you get all that?" He whimpered, one giant paw reaching back to rub his aching buttcheek. Your padded bulge pulses, your massive cock throbbing inside your beast briefs as you fight the urge to sink your flesh into his. Drooling with your tongue out and panting at the sight of your meal, you drop down to your hands and knees, both hands splatting into the canine's turds piled on top of his old diaper.
Your thin tail whipped from side to side, almost in unison with the saint bernard's much faster wags. He could tell what you were about to do, and it excited him from the non-existent smarts you were showing off. "Of course! You can fight off the room filling up, and I'll try and look for that special brand!" Davis exclaims, thinking it was your idea when really you're just submitting to urges beyond your power. Inching forward, you groan loudly as the first turd plops into your nearly-open maw. It doesn't taste horrible, but you can tell that it would have if you were still human. The flavor and most intense taboo you've ever felt are indescribable, but it's all the same just as amazing. You quickly munch through the fat log, swallowing it after a few moments, and watching in anger and hunger as your second loaf plops down onto the diaper between your hands.
You can't imagine letting any more of it go to waste. After all, once it hits the used diaper, it's not sanitary anymore, right? Without thinking much harder about the flawed logic, you lift up your hands and inch forward with your knees, your cock throbbing and belly still bulging outward slowly, and spank both hands onto Davis' massive ass. "BOOF!" Davis yelps, blushing a deep red as his fat body ripples outward from your hands. His cheeks compliment your hands nicely, and are surprisingly bigger. The shit coating your palms and fingers reminds you of your hunger, your cock splurting pre into the front of your diaper as you lean forward and stop appreciating the incredibly hot, stinky, and impressive ass.
Just as another turd is crowning, you lean forward and press your lips to the beefy mutt's donut-shaped butthole. The feeling of his pucker on your lips sends a chill down your spine, and makes your cock tent your diaper entirely now, leaking more pre and now sinking the front of your diaper into the mess on the floor. The intense warmth, even from the old mess, envelops your crotch. Pure pleasure rushes through your body, especially as Davis grunts and pushes harder for you. A fat BLORCH blasts out of his ass, surrounding you in his stinky aphrodisiac fog while the first of many turds squelches through his hole, past your lips, and down your throat to your growing belly. Immediately feeling the straight of eating without pooping, your eyes roll up as you begin to push. Without much effort, your own massive bull booty spreads apart, donut hole pushing outwards and squishing against the very back of your beast briefs. After a long, incredibly gross burst of gas, you feel it finally start unloading. Log after turd after load, your beast briefs begin to fill to the brim! After swallowing a few logs from Davis, you're not at all surprised with how much poop pumps out of your burgundy ass, but the sensations of wearing such a bloated, straining diaper does surprise you, and the feeling of it smothering the back of your aching, pent-up bull nuts...
Davis looks back over his shoulder, still panting and sweating all over, and blushes deeply once again. His own cock throbs, pre gushing onto the floor in front of him. Figuring it was best to start looking, he does, reaching for a box between grunts, and searching through it slowly as he shudders in pleasure and poops down your throat. Your belly continues to deflate, the load of your own poop filling your diaper and somehow stretching it more and more as time goes on. The steaming-hot sensation constantly pumping out of your ass quickly begins to surround your crotch, as the front of your diaper begins to fill with the excess dump that the back can't contain. You desperately hump and grind against the ground, squishing all of your extra shit across your taint in every possible spot. Your waistline becomes coated in your waste, and the stench of the room, not to mention the stink directly coming out of Davis' booty, is blissful, and mixes with your own stink and both of your musks to stimulate you both to edge.
There is a turning point in your stomach. More than half of your dump is finally out of your belly, but now about a third of what you've pumped out of your own butt has also come out of Davis' butt, and is now beginning to fill your gut back up. Your diaper has expanded in every direction, with most of it welled up around your crotch and being forcibly stained into the front by your cock. What looks like piss stains are actually your greasy sweat stains, and the blissful stench is now so potent that it nearly stings your nose... in a good way, of course. Your throat has been bulging the entire time, and if anyone were watching, every single turd could be seen outlined as it expands and retracts your neck on the way down. Your belly wobbles now, and the desperate need to take a breather begins to settle.
Just as you're about to worry, and thankful for nothing taking away from your raging hard cock, Davis suddenly beams with joy. "I found them!" But looking back to you, you both lock eyes as he forces an unbelievably fat, greasy turd down into your belly. The pleasures and sensations of all of this are amazing for both of you, and something in his look makes you think this is his first time really being 'on top' in a sexual scenario. His eyes are half-closed, sweat is soaking his entire body at this point. Cum is splurting every half-second onto the floor as it hits one of the boxes like rain tapping on a window. His tongue is fully out, not hiding his pleasure from all of this as he keeps shitting without effort, now seemingly in a rhythm.
As you contemplate what to do, you notice the special beast briefs in his paws. They're a dark purple, and the frontal design has the same wolf from before, but with a protective bubble like you would normally see in RPG games. Imagining Davis wearing it, and looking up at his tail wagging like crazy while you gulp down his big saint bernard poopies...