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This story was written for Sigma117 as Day #30 of Kinktober 2018. Today's kink was "Diaper TF" and the story contains solo masturbation involving a consenting adult intersex male, watersports, diaper play and transformation. :3

Brand Testing

Sigma giggled as he affixed the final tab across his left hip, and ran his hand down over the crotch of the diaper. It rustled gently between his paw-pads and the fur and flesh of his crotch below, and a gentle purr escaped the cheetah as he admired just how comfortable it felt, how soft and well padded in the most luxurious sense. Truth be told he had been somewhat embarrassed when his local grocery store had gotten in touch and told him that thanks to the regularity with which he purchased adult diapers he was eligible to try out a new brand they were considering stocking as part of their customer loyalty programme. The idea that someone out there was paying attention to his diaper usage, albeit without any certainty that it was for recreational use rather than any form of actual necessity, made him squirm and blush. Now that the new diapers were here though, and now that he had wrapped himself up in one of them in preparation for a long day of chilling out alone at home, his embarrassment was rapidly turning to excitement. To delight as he strolled around the apartment and felt the puffy, absorbent material of the diaper hugging close against his midsection and not just remaining comfortable to wear, but actually seeming to be somewhat stimulating as its crinkly yet gentle material rubbed against his hips, his buttocks, and of course his crotch.

Flopping down on the couch after getting a few quick chores done, Sigma cracked open a can of soda and settled down dressed still in nothing but his diaper to watch TV. For an hour or so he chilled out just sitting there in that diaper, relaxed and excited in equal measure as the longer he wore that highly specialised garment the more comfortable it seemed to grow against his skin, while with every slight motion he found himself more and more aware of how the absorbent inner material of the diaper rubbed and teased in a rather stimulating manner at his nether regions. His face flushed as he squirmed and giggled to himself after padding over to the fridge to grab a second can of soda, feeling the diaper ride up ever so slightly as he sat down again and shivering as he swore he felt its internal fabric caress his clit. It wasn't until after his third consecutive can of soda however that Sigma allowed himself to admit that it was more than just the thrill of trying out some new, free, luxury diapers which was making him feel the way he was increasingly beginning to feel.

The cheetah was beginning to feel a familiar tightness, a familiar need emanating from deep within himself, in particular from within his bladder. He found himself squirming, wriggling and blushing in his seat as he purposefully held back, as he let himself sit and stew in those wonderful feelings of neediness and helplessness, denying his body and his mind the bathroom break they were asking for in equal, increasingly urgent unison. And sure enough as he writhed and squirmed within his diaper, it became increasingly clear to Sigma that this wasn't just in his head. These luxurious, super-soft and super absorbent diapers weren't just pleasant to wear. They were too pleasant, so able to fill every curve and crevice with their soft and copious padding that with every motion he made within them it was like he was being stroked, like he was being caressed by the very fabric of the diaper itself in a way that might have started out as gentle and soothing, but which the more he moved and the more his body responded to those sensations was becoming increasingly and deliciously erotic.

"Mmmh..."

Sigma murmured happily as he turned off the TV, and laid himself back against the rear of the couch's comfortable cushions, barely able to hear the gentle rustling of the plastic sheeting beneath them. His cheeks flushed a little more pink beneath his grey fur, and he nibbled on his bottom lip as he reached down between his legs and ever so tenderly ran a few fingertips over the well padded, deliciously soft front of his diaper's exterior. His hips rose up to meet the caress if his fingers, and though it was far too gentle a touch to make it through the fabric the cheetah still moaned as the motion of his body alone proved sufficient to make the diaper shift and rub up against him once more in the most intimate and stimulating manner yet. Whimpering, giggling bashfully, he removed his hand and let it fall to the couch below to support him as he thrust into the air with his hips a second time. His eyes widened, and he let slip a breathy gasp as sure enough even without any pressure at all from his fingers, no matter how slight, the diaper rubbed and caressed him from within. His hips rocked again, and again, and before long a mewling cry of sheer elation and undeniable arousal escaped Sigma as he realised that he wasn't merely teasing himself any longer with these increasingly intense and pleasurable feelings.

He was masturbating. Pleasuring himself without assistance, without fingers or a toy or any source of stimulation beyond this brand new and supremely high quality diaper itself. And more importantly, he was doing so with such ease and such success that he could already feel something building within himself. Something other than the increasingly powerful and itself pleasurable ache of his bladder, as he humped his clit and quivering pussy against the interior of the diaper, and felt himself rising to a wonderfully unexpected, deliciously naughty hands free, diaper-induced orgasm.

"Yes. O-oh... please, yes..."

The more that Sigma humped and bucked his hips, the more his diaper had to work in order to keep itself clinging tight to his body against his increasingly rapid and urgent motions, the more the material seemed to press down around his crotch and in the process further stimulate his needy nether regions. The cheetah remembered something on the diaper's packaging that had bragged about its ability to remain affixed and water-tight through even the most demanding physical exercise for someone who needed to wear one while on the go, but this was beyond anything he'd imagined. The diaper wasn't just clinging to him, it felt like it was holding him. Like its rustling, crinkling fabric was embracing the entirety of Sigma's midsection in the same way that a lover would fight to keep their crotch, their fingers or their lips pressed to their lover's needy, pleasure-stricken nether regions by any means necessary. There were even moments when Sigma swore he could feel the fabric within the diaper itself moving independently of his own thrusting hips and throbbing, quivering inner workings. There were times when he was sincerely convinced that if his hips had stopped thrusting he would have felt his diaper wriggling and rubbing against him, actively caressing his clit and the outer reaches of his pussy overall in a shameless attempt to bring Sigma relief and peace in the only way that seemed likely to work. By making him cum.

"I'm... aaaah..."

Running on pure instinct, Sigma reached down between his legs as he feverishly humped at the air and felt the diaper rustling and rubbing so deliciously against him. He reached down with the intent of not just rubbing his crotch, but slipping a hand beneath the waistline of his diaper and pressing several digits inside himself, the one thing which thus far the diaper's masturbatory influence had been unable to replicate. As he did so though, the cheetah whimpered bashfully. He was so worked up, so horny and so mindlessly pleasure stricken as a result of his body and the diaper working together to get him to this point that his hand wasn't responding properly to his desires. His movements were obviously slow and sluggish, which was surely the only reason he could account for the fact that he somehow couldn't find the waistline of his diaper. It felt to his trembling fingers as though his digits slid from soft fur to crinkling fabric without any border, and after three or for attempts were tried and swiftly failed in that regard, Sigma actually looked down the length of his body to see why the hell his hand was so numbed and useless as a result of this particular bout of self-pleasure.

His eyes widened. A confused, undeniably horny mewling gasp escaped his lips, and the cheetah stared helplessly as he looked down at his crotch and saw precisely why he couldn't find the gap between diaper and flesh.

"O-oh god... w-what...?"

Sigma's hips froze, trembling in mid-air as he stared at his diaper, once pure white but now an identical grey colour to that of his fur, even bearing a few speckled rosettes upon its fabric. His eyes rolled in their sockets, and he yelped in overwhelmed, stunned bliss as another wave of pleasure crashed over him even with his body now all but motionless. Within his diaper, he felt the soft, absorbent material pressed against his clit shift and wriggle without any provocation. He felt it pressing tighter and tighter around his clit until it practically encircled the swollen nub, and with no other source of stimulation or motion to continue bringing Sigma pleasure, the diaper acted with a mind seemingly of its own and began to squeeze and rub far more powerfully than ever before at the throbbing nub.

"Aaaah... aaaahhyesssss, I... I'm... oh god! Oh, g-god... cumming!"

The cheetah's eyes bulged as he watched his thighs tremble, as he watched his lithe stomach flex and tighten, and as the thrill and ecstasy of his orgasm crashed over him, he watched as those same parts of his body lost their furry, fleshy texture, and instead began to plump up and grow more rounded, softened, padded and somewhat crinkly before his very eyes. He was still writhing and quaking in the throes of his orgasmic bliss as the change rapidly began to spread down his legs, Sigma whimpering in helpless pleasure as what looked like a seam opened up down the side of each leg, his limb looking as though it was about to unravel when suddenly some very familiar looking adhesive tabs rose up from the increasingly soft, absorbent material of which his legs were now comprised.

Sigma collapsed back into the embrace of the couch before long, blushing, panting, still squirming as the pleasure of his orgasm gave way to a far more intense and desperate need for his bladder to empty itself, a feeling renewed and heightened by just how sensitive his nether regions now found themselves. Even then though his attention was divided, unable to keep his mind fixated on the desperate need to urinate as he looked down and saw his feet swelling, growing puffy as his lush fur simply melted away into smooth, soft fabric. It was impossible of course. Sigma knew that he couldn't be seeing and feeling what it looked like he was seeing and feeling, but reality didn't seem to care about that. The rules of what was physically possible seemed to suspend themselves as far as the cheetah was concerned as no sooner had his footpaws completed their transformation he felt the same change beginning to sweep up the remaining length of his body at a far greater pace.

"O-oh god..."

The cheetah mewled as he watched his arms changing, wiggling his own fingers in front of his eyes and gasping as while he stared, while he focused on them and he found himself able to feel the change in sensation as flesh became fabric, as skin and bone became rustling, crinkling diaper. He touched his newly transformed hands to his face just in time to feel it changing too, feeling his ears, his hair, even the muzzle from which his whimpers and moans of bashful, excited confusion were continuing to arise taking on that new texture and composition while still retaining their ability to feel, to move, to live just as he had before... only now not as flesh and blood, but as one single, living, breathing diaper-critter. It wasn't merely covering him like a suit, he wasn't wearing it as he had worn the diaper covering his midsection.

He was the diaper now, and it was as that thought crossed Sigma's mind that a simultaneously terrifying and intensely arousing thought crossed his mind.

With plump, crinkling paws reaching down hurriedly to his crotch, Sigma mewled and felt his padded cheeks burning hot as he cupped his diapered nether regions. Except, it didn't feel as though he was cupping his diaper-clad crotch any more. It felt like he was cupping himself. It felt like he was simply touching his bare, naked body, and sure enough though there was no sign of any visible genitalia whatsoever on the exterior of his diapered self a louder, more pleasure stricken cry escaped the cheetah as his fingers caressed and explored only for his crotch to react as though he had begun masturbating it all over again. Sigma cried out in excitement and anguish all at once, his mind reeling as he realised what that meant. He wasn't wearing a diaper any more, because he was the diaper, and that meant he was naked. That meant he was touching himself, rubbing himself, pleasuring himself without anything to hold him back this time around. But, as pleasant as that thought might have been to explore on his own, it meant something else too.

"O-oh... oohh god..."

Sigma writhed and whimpered as he felt another desperate ache from his bladder, and tried to let go. He closed his eyes, he pressed his hands to his rustling, crinkling, ever so sensitive crotch, and he tried to let himself urinate... to flood what should have been the now most definitely sealed interior of his diaper, and release the intense, arousingly unbearable pressure of his full bladder. There was a problem with that though. A rather obvious problem that Sigma didn't know how to solve. He wasn't wearing a diaper any more, and thus there was no pussy, no clit or vaginal opening or urethra hidden away beneath the crinkling fabric of his diaper-critter self.

Rubbing at his puffy, crinkling crotch more and more urgently, feeling the pleasure swell as the sensitive material responded to his touch and suppressed the aching needs of his bladder at least partly in the process, Sigma mewled and moaned. He had no way to relieve his bladder. He had no way to urinate, locked in this state of perpetual desperation and excitement for as long as his body remained this way. His cheeks burned hotter. His toes rustled as they curled and quivered in arousal. All that he could do to relieve the intensity of those desperately needy feelings as he lay there was to keep on touching himself, to run his hands all over his soft, plush, diapered crotch. And thus, the cheetah resolved that was precisely what he would do. What he had to do until such a time as he figured out a way to let himself go, or until the diaper he had been wearing decided to loosen its grip upon his squirming, writhing body once more.

He would masturbate, and he would cum in whatever way the body of the diaper-critter that he had become would allow. And if after that nothing changed, then he would do it again... and again... and again, until one way or another, he was finally allowed to wet himself like the horny, diaper-clad cheetah that he was.

By Jeeves

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