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Neither Stanley nor Marcus wanted to ever see water or wine again.

Another evening, another lewd game to play. All in good fun between brothers who verged on lovers, a pair of rats with ram horns who filled their days with incestuous misdeeds. Their December treat: a sexual Advent calendar, each day a unique experience, per the advice of a column Stanley had read on a blog.

Stanley - black-furred, chocolate-eyed to the lab rat white and red of his twin brother - ran a fleshy hand over his belly. Though somewhat doughy to begin with, Stanley was certain his gut had grown in the last hour and a half of drinking; he voiced as much, quivering: "You could take a needle and pop me right now, I'm so bloated."

"I think you're just imagining that," Marcus said, a note of strain in his own voice. Of similar pudge, the white rat pushed up against his brother's flank, nosed his neck, joined him in softly palming the black rolls of his gut. Like touching a pregnant lady's bump, Marcus was delicate and reverent, smiling at the soft coos and winces his brother produced.

The black rat, toes curling, slid a hand over Marcus' own ample belly. He brushed past it quickly, gripped his brother's penis, and squeezed it. Both rats sported throbbing erections of a basically equal size, though Marcus sported flesh pinker than the more ruddy hues of his brother. The white rat shivered, curled his toes, and pressed his face into the crook of his brother's neck.

"Ooh, gawd," breathed Marcus, clenching every muscle just to keep from springing a leak. Beads of precum oozed from his penis; Stanley captured them and began to masturbate his brother, though slowly and rather lazily.

"I feel like when I do finally go, it's going to be enough to fill a swimming pool," groused Stanley, blushing and smirking despite his grim tone.

Marcus kissed his brother's neck several times in a tight grouping. Then he licked along the other rat's jaw and chin, met his lips for a kiss in which their tongues tangled together, overbites bumping in a familiar way. As this kiss tapered off and Marcus clutched his brother's penis in reciprocation, he asked slyly, "Am I bottoming again tonight?"

Stanley's fingers dropped, brushed his brother's scrotum. Being rats, both he and Marcus had quite plump balls - though not out of proportion, not like some rats he and Marcus had seen in lewd pictures.

"I guess I'll bottom tonight," the black rat said, putting on a tone of playful annoyance, "if I have to." Having spoken, he threw a leg over Marcus' lap, straddled him, touched his round black ass to the white rat's throbbing cock. "I'll powerbottom, that is."

"You're always a good powerbottom," Marcus said, shivering at the sensation of Stanley's hot crack enveloping his cock. "Don't press too firmly on me, though. I can't promise I won't leak."

Both rats leaked precum so copiously that by the time Stanley had guided his brother's cock to the bud of his anus, the flesh was so slippery that there was no need for lube. Even then, as the black rat felt his asshole spread and his brother's penis press inside, he shuddered with a hint of pain - just enough of it to enhance the pleasure, like salt on sweet fruit.

Marcus lowly groaned as Stanley's tight anal walls enveloped his penis. As the pleasure rose, so did the need to urinate, and he cringed as a stab of pain lanced his belly. He imagined his bladder as a water balloon, one so overfilled that it was nearly transparent. Visualizing it only made the need worse; and then his brother's round bottom came down against his loins. Stanley's balls rested on his stomach, and even that minor weight seemed unbearable. The white rat burbled, "Oh, god, why do we do these silly things?"

The black rat was huffing in pleasure and need alike. A steady drizzle of his precum flowed over his brother's subtle gut. "B-because," his voice quavered, "it's just so much fun to torment ourselves."

Stanley began to ride his brother. He moved slowly, wincing each time his belly jostled. He clutched his stomach protectively, inadvertently putting more pressure on his tender bladder, and he uttered a moan both of pleasure and pain. "Oh-, oh, god..."

Marcus breathed slowly and deeply like a woman in labor. He peered at the ceiling through half-lidded eyes, looking without really seeing. He wrapped his fleshy hand around his brother's twitching phallus and masturbated him slowly; his brother gasped, said to him, "Careful, easy! God, every time you pull it, feels like I'm going to piss everywhere..."

"You know the rules," Marcus said in a strained voice. "No letting go until you cum."

Stanley grinned bitterly at his brother. He braced his hands on the other rat's shoulders, and in shifting his weight allowed their stomachs to brush together. Both rats felt the pressure; Marcus let loose a spurt of what he would forever insist was precum. But in the moment, so burdened with his own bladder as he was, Stanley let it slide without comment.

The black rat leaned over his brother and dipped his head low. Their stomachs rubbed together and the pressure became all but unbearable but Stanley was committed to the kiss, and he pushed until their lips met. Marcus kissed him back and their tongues slid alongside one another, but quickly the white rat broke out of the kiss. He bleated to his riding brother, "St-Stanley, for god's sake, you're killing me..."

Being the powerbottom tended to put a mean streak into Stanley. Just as easily it could've been Marcus on top, bullying his dark-furred brother, taking strength from his pain; the brothers playfully gave and took in this fashion. Stanley kissed his brother shallowly and mashed his hips down with particular ferocity. Marcus cried out, said desperately, "Are you trying to make me explode?"

Stanley grunted from the pressure himself. He was certain he wouldn't make it, that he would piss on his brother well before he came. It was that certainty that unchained him. He bounced on his brother freely, moving as if his bladder wasn't a lump of wine and water in his belly just waiting to escape. He crushed his bottom into Marcus' loins as though he wanted to break his brother's hips. Each time he slammed himself down, he felt the liquid shift and tumble in his bladder; and he trembled with pleasure, loving as always the feeling of his brother's cock gouging open his ass.

"Re-, remember," Stanley hissed, grinning at Marcus' hopeless, pained face. "No letting go until you cum!"

"Oh, for god's sake, Stanley," Marcus cried. He pawed at the black rat's shoulders, tried to push him off, but Stanley kept riding him. Despite how much he enjoyed his brother's tight anal passage, Marcus felt he was getting no closer to his orgasm; it was as if his penis was only an extension of his bladder, full of piss and hard only for that reason. He grimaced when he said, "Stanley, please, ease off..."

To Marcus' surprise, Stanley did just that. He pulled his rump up and off of his brother's cock, and he gasped at the sudden exit. His anus remained slightly gaped and open, slick inside with precum; but Stanley had no time to appreciate what his brother's cock had done to him. Quickly, feeling like he might rupture at any moment, he lifted his brother's legs and parted them. Marcus peered at him, squeaking in surprise, cheeks red with blush.

"Are you serious?" the white rat asked, bewildered.

"I still want to be on top," Stanley said, strain in his voice alongside that domineering sneer. "So that's where I'm staying."

Like his brother, the black rat also leaked enormous amounts of precum, and seemingly now more than ever, as if his body was trying desperately to get rid of as much fluid as it could. He held his brother's legs and he probed with his stubborn hard-on, touching it to Marcus' taint, then the tight pink bud of his anus. A quick push and he was inside, sinking deep, making his brother cry out and then groan as pleasure took hold.

Marcus, though as much a switch as Stanley, particularly enjoyed being penetrated. The white rat pawed at his brother, fleshy hands whispering over dark fur. Purposefully and vindictively he pressed on his brother's stomach and listened with a wry grin to Stanley's strained whine.

"Damn you, stop that," the black rat wheezed; but their gazes locked, mutual love and lust conveyed in just a moment of eye contact. He fucked his brother quickly, but with a jerking pace. His breaths came in deep, hungry gasps and he clutched at his belly, crying out at a stab of horrid, urgent pain. Then he gripped his brother's cock, still greasy with precum, the flesh musky with Stanley's own anal scent. He jerked Marcus off briskly, wet penis gliding in his palm, free of friction. From Marcus' cock shot heavy globules of precum and the white rat writhed and whined, squeaked and squirmed, his toes and his fists clenching and releasing as surges of bladder pain wracked his body.

The white rat said plaintively, "Stan-, Stanley, good fucking lord," I can't handle this, it's too much, I need to piss!"

"Me-, me too," Stanley snarled through gnashed jaws. He threw everything he had into fucking his brother, selfishly rutting his familiar asshole with rowdy thrusts matched only by his masturbation. He felt something change in his brother: a sharp tightening of his anal walls, the flex of his penis. That tightness and the knowledge that his brother was as receptive as ever to his gay affections pushed Stanley similarly over the edge, and the black rat cried out, "I'm cumming, oh my god...!"

Marcus couldn't squeeze out a single word. He began to ejaculate, loosing a fat white rope through his brother's fingers. At the same time, the general tightening his body underwent in climax wrung his overtaxed bladder like a fruit. The valves which closed his penis off from his bladder when he came were forced open by a torrent of piss, causing him no small amount of pain; and a mixture of urine and semen both gushed from his flexing, pulsing cock, washing over his chest and belly and face, splashing into his maw - opened as he cried out in pain and pleasure.

For Stanley the moment played out similarly to the bliss and agony his brother displayed: the weight of his piss forced its way out of his body even as he came, and he filled his brother, overfilled him, sent a wash of fluids deep into the white rat's spasmodically clenching asshole. It spurted free of Marcus' ass, utterly soiling the bed with piss and cum alike. Both rats writhed and whined, pressing close together, Stanley no longer fondling his brother, no longer fucking him. They clung to one another and kissed savagely, sharing in the indulgence of Marcus' piss-soaked breath while. The urine flowed but the throbbing pains gradually subsided, leaving only the warmth of relief and orgasmic pleasure blended together, much like the semen and urine ruining their coats and their bedspread.

Slowly, like a thunderstorm tapering off to a trickle, the urine from both rats subsided. Still there was the twinge of pain, rings of muscle meant to block off one pipeline or the other made sore by the rush of piss. To both rats the pain was not unlike that which followed urethral sounding. The kiss broke off slowly, left yellowed drool clinging to their lips.

Marcus, shuddering, nuzzled with his brother. "That-, that worked just like the blog said it would," he marveled.

"A bit, um, more painful than I was expecting," Stanley said sheepishly. He palmed his brother's cock; Marcus cringed with pain, yet also groaned in pleasure. The black rat grinned. "I wonder what tomorrow's pleasure will be," he mused, as he nosed his brother's neck and snuffled the piss-damp fur.

"All I can say," the white rat sighed, "is I'm looking forward to trying it with you."