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This story was written for HP1741A as part of their top-tier patreon reward! It contains M/F sexual acts between consenting adults, masturbation, hyper/growth related lewdness and drug use.

Gro++

Cynthia mewled softly, frustrated but not overly surprised, as she sat near motionless before her bedroom mirror. The quadruped lioness shuddered with arousal as she stared herself deep in the eyes, seeing herself tremble, watching the slight condensation fog up the portion of the mirror directly before her face as hot, ragged breaths washed out across its length. For almost a minute she sat there without moving, just watching herself as she shook with arousal, but not nearly the kind of arousal that she should have been experiencing in that moment. Finally, with a frustrated whimper and a shake of her head, she turned away from the mirror and towards her bed. Upon it, resting with his legs crossed and his torso leaning forward in expectation, Victor smiled at her reassuringly.

"It's okay, Cindy. We kinda thought we'd gotten to this point, right? I mean... that's why we applied for you to be part of the testing programme."

The powerful lioness, larger and stronger than the average member of her species by a substantial degree, rose from her haunches and approached the bipedal male. She launched herself up so that her forepaws came to rest upon the bed, shuffling forward until she and Victor were face to face. Lightly, lovingly she licked him across the face, then moaned as his hands encircled her cheeks and he kissed her deeply. She returned the loving kiss for a while, only to break it with another moan of fevered longing.

"I know. I... I know what you're saying is right, Vic. But, it still feels... wrong, y'know? Taking the pills. Taking Gro, and... not growing. It seems like just yesterday I was trying it for the first time. M-my whole body... my pussy... your cock, e-everything getting so... so... o-oh god... Vic... I need to feel that again. I need to. Please. Let's not wait any more."

The male lion stared at his lover, still gently holding her face in his hands though now somewhat further apart, not immediately ready to spring back into another kiss. Victor smiled as Cynthia whined and shuddered visibly again, unable to deny how beautiful, how incredible the lioness looked. Of course, that was true all the time as far as he was concerned, but particularly so when she got like this. So worked up, so overwhelmed by her own needs and longings. Even now though, he couldn't help picture the old Cynthia. The versions of herself and indeed him too who had existed before they had ever heard of SinTek and Gro. The young, comparably naive lions who had barely been out of college when they'd first discovered those incredible chemicals and their effects. To think, how little they'd known of their own bodies at that point in their lives. How little they'd known of their own potential, both the temporary unlocking achieved when Gro was taken, and indeed the lingering effects of that chemical enhancement that remained with them even now.

Cynthia growled in lust, and Victor's eyes widened, his cheeks flushing slightly beneath his golden mane as between himself and the beautiful lioness' face something thick, red and urgently throbbing bobbed in their mutual field of vision. Rising from between his crossed and folded legs, well beyond the length of his forearm and twitching urgently as it rose to full arousal, Victor's cock stood as a testament to the lingering influence of Gro upon their bodies. Indeed, as he looked up and past Cynthia's face he could see her own nether regions reflected in the mirror before which she had previously stood, trembling beneath her raised and twitching tail. Two curved and gorgeous ass cheeks. Two thick, powerful thighs, and between them not just a pussy that was plump and sumptuous in its arousal, but large and already obviously engorged much as his cock appeared.

Glancing between the reflected image of her pussy and the lioness' face as she remained resting half on, half off the bed before him in eager expectation, Victor was tempted to delay their exploration and experimentation just a little longer. To instead ask that Cynthia turn around right there and then, unchanged and with only the lingering influence of their past chemical usage lingering within their bodies, and bury his face between her legs. To press fingers, maybe his whole fist into her pussy, and to suck on her gumball-sized clitoris until the lioness was clawing holes in the bedroom carpet in her roaring, screeching lust. Much as Cynthia's pleasure would have been the focus of any such actions of course, he knew that urge was still self-centred and ultimately self-serving. He knew that he was holding back. Delaying, denying Cynthia what she had been waiting not just all today but for so many days and weeks prior to this for the chance to finally achieve.

Taking a deep breath, the lion smiled to his lover. To the woman whose needs and lusts exceeded his own even without chemical intervention. To the woman who through her actions had introduced him to all the incredible feelings that Gro had granted them, and without whom he never would have been gifted the incredible, huge cock now throbbing between his legs. He was nervous. Scared even about what they might have been about to embark upon. But, afraid or not, that fear did not trump or even come close to matching his trust for the woman he adored, and craved more than anything on this earth.

"Okay, Cindy. Let's do it. L-let's see what this new treatment can do for us. For you."

Drawing himself back across the length of the bed, away from the lioness as she too pulled away and returned all four paws to the bedroom floor, Victor moved towards the bedside cabinet and the small metallic case upon it. Cynthia had been so thrilled, so overwhelmed to finally see that case being handed to them by the mail-person that morning. Now though, as he reached out and placed his hands upon its catches, he could hear her purrs reverberating off the walls of their bedroom with their deep, booming intensity. A strained moan of bliss escaped Cynthia when he actively opened it up, followed by an almost feral, guttural snarl of lust when he lifted one of the small glass, liquid filled capsules and slipped it into the pneumatic injector provided as part of the set.

He turned back towards the love of his life, watching as she prowled and paced, hindquarters glistening as hot arousal ran shamelessly down the insides of her thighs and her clit throbbed with a visible urgency. He lifted the injector in one hand, and in the other, much to Cynthia's dismay, the instruction booklet which had come with the kit.

"P-please... c'mon, Vic... you know what to do. You've read it a dozen times already."

In truth, he did know exactly what it said. And even if he hadn't, the whole purpose of this kit was that it was suitable for home use, suitable for amateurs to operate. Perhaps there was a little bit of nervousness creeping in once again though, or maybe on this occasion Victor simply wished to tease his lover, get her even more worked up in anticipation of what was now obviously soon to come. Either way, he cleared his throat and began to read the brief instructions from SinTek once again as the quadruped female writhed and shuddered in desperation before him.

"To our esteemed and loyal clients. It is the greatest privilege of SinTek Pharmaceuticals to be able to push the boundaries of what is possible for the mind and body to achieve. Less than a decade ago our pioneering line of Gro products took the world by storm, and we have been thrilled ever since to hear the stories of literally millions of people worldwide who have had their sex-lives transformed by our products. We are however aware that for some of our most frequent and eager clients, the repeated use of Gro has led to a diminished effect. In order to remedy this, we have been spending the last three years developing a new line of products. A line which now we are ready to begin offering as trials to some of our most regular and trusted customers, yourselves included. Our new treatment, Gro++..."

Victor raised the injector and its content up a little higher, grinning as Cynthia whined and shuddered in fevered hunger once more.

"...is more potent, more long lasting, and shows none of the diminishing effects of Gro in previous users. To use, simply insert one of our patented bio-degradable gel capsules into the pneumatic injector provided, and following the diagram enclosed to select an appropriate injection site. After trialling our product, please fill in the provided survey so that we may gauge your satisfaction."

Finally Victor lifted his head and looked towards Cynthia once more, grinning playfully.

"The first muscle they suggest injecting into is... well, your ass. But somehow I think that could end up a little bit uncomfortable."

Both lions blushed and shuddered slightly as they pictured an all too regular occurrence during their intimate fun, the male standing upright behind his large quadruped lover, hips jerking wildly back and forth, not just fucking her but practically spanking her ass at the same time with the motion of his midsection. Indeed, if they were to place the injection practically anywhere upon Cynthia's ass, they would effectively end up limiting how fast and how roughly they could fuck once the effects of the new Gro++ formula took hold. Thus, they were both immensely glad that other options were suggested.

Victor moved closer to Cynthia, nodding warmly as she raised a foreleg towards him expectantly and tilted her head towards the muscles of its upper length, just below the shoulder.

"Here. D-do it... here. Oh god, Vic. I... I can't believe this is finally happening. I can't believe I'm gonna feel this way again. L-like when we first started taking regular Gro."

The male continued to smile, but as he stroked his lover's face, caressing behind her ears while he lined up the injector where she had requested it, he tried to keep her expectations as measured as possible.

"Just remember, I'm here to make you feel good no matter what. I know the results we read about from the clinical trials seemed really, really intense, but those were lab tests of a prior formula. Let's enjoy it, whatever it does. We don't need it to work miracles. We just need it to work, right?"

The lioness trembled, and nodded.

"R-right..."

But Victor could see clear as day that she was anything but convinced by his words. To Cynthia, this was an all or nothing moment. Either Gro++ lived up to the hype and transformed her every bit as intensely and extremely as the original Gro had done before she became resistant to its changes, or she would see it as an outright failure as a replacement. And if that was the case, then he really had no choice but to hope, to beg, to silently pray that it worked that intensely too. He wanted to feel good, sure. But more than anything else in this world all that Victor truly wanted was to see the woman he loved both happy and satisfied to the core.

Cynthia's eyes bulged as the pneumatic injector hissed and drove its needle into her upper foreleg's musculature, but she didn't cry out. The pain was only momentary and more than manageable, the shock of its sudden presence and disappearance far more potent than any lingering discomfort. She looked up at Victor, then turned slightly to face her rear towards the bedroom mirror once more, peering back over her shoulder to regard her plump ass, strong, tuft-tipped tail and already dripping, plump pussy. Her face was flushed. Her breathing was ragged with desire yes, but also intense nerves as she waited to see, to feel if it was going to work. It had been almost a year since the Gro formula had started to lose its effectiveness upon her. Almost a year since Cynthia had experienced the true, overwhelmingly wild highs of sexual pleasure that SinTek's chemicals had once granted her with such wonderful regularity. She wanted so badly to believe that all that waiting was at an end now. That things would change, and that Gro++ was about to transport her to whole new heights and realms of ecstasy. But right now, in the agonisingly slow seconds following the injection itself, all that Cynthia could do was wait.

Wait, and count down the minutes, the seconds until her wildest wishes and most desperate, lustful longings hopefully came true.

*********

Except... there was no wait.

Gro, taken orally, took a little time to take effect. But with the potent chemical cocktail of Gro++ already worming its way through the heavily vascularised tissue of Cynthia's thigh muscle and into her bloodstream as a whole, there was only the most brief and momentary delay before the lioness felt her breath catch in her throat. Her eyes widened, and though they stared more hungrily than ever, more desperately and happily than before at the reflected vision of her own pussy in the mirror, they were soon compelled to turn away. To look to Victor, standing beside her staring at her backside with an expression of focused, hopeful curiosity that turned to delight as she caught his attention with a loud, giddy moan.

"It's... s-something's happening..."

Until now Cynthia had been the confident one. The one so eager for this opportunity that she had not dared to consider that it might not work quite as well as the tests had promised and her own heart, never mind her loins, had led her to hope. But now that she was actually feeling... this, this something, whatever it was, she dared not give it the name she longed to. She dared not let herself down by believing so whole-heartedly that the tingling between her legs and the throbbing of her clit was anything more than the placebo effect in action. Carefully, still breathing heavily but not letting herself get more worked up without cause, Cynthia closed her eyes and spread her legs a little further apart. She tried to steady her breathing. She tried to calm herself. To remove all emotion and passion from the equation, and leave only the stark, honest truth remaining.

She roared. She screamed sharply, without the slightest warning as a wave of pleasure surged through her like lightning. It began in her clitoris, throbbing intensely, and spread inward through the depths of her suddenly clutching, convulsing inner walls. Her claws dug into the bedroom carpet as her head snapped back, spittle flying and the entire length of her body quaking as a potent streak of feminine ejaculate gushed from her pussy as it began to bulge and swell. She very nearly collapsed to her belly when the pleasure abated, but somehow managed to remain standing as her eyes re-focused and returned their gaze to Victor. There was no denying it now. No hiding it or desire to hide it.

"It's... ooohhh Vic... it's r-really... aaaahhhh! Ah! I can feel it. J-just like... ohh god, just like before, b-but... better. I'm cumming, Victor. A-and... I'm... I'm growing."

She was correct on both counts. No sooner had she ceased addressing her lover another fevered roar escaped the lioness as a second orgasm crashed through her seemingly out of nowhere, her buttocks and thighs trembling visibly as again alongside the intense pulsing of her inner depths the flesh of her pussy in its entirety seemed to bulge, to swell, to grow in size. It was already beginning to hang down as the lioness fought to catch her breath in the wake of that second mind-bending peak, swelling thick and heavy to the extent where it could no longer remain held tight against her loins. Her clit strained outward, protruding more and more obscenely beyond Cynthia's outer lips, and as she felt her body beginning to tense and quake all over again in the build up to what had to be another bout of blissful growth, Cynthia's glazed eyes bored pleadingly into those of her lover.

"Watch me. O-oohh please, Victor. Watch me grow... b-before you... before we... aaahh... yes. Yes. I want you to... t-to be able to describe it all to me. To remember it all afterwards. Please."

Still standing with the empty injector clutched in his right hand, transfixed and beginning to look more eager, more overwhelmed with wonder and delight as he realised that Cynthia was getting exactly what she had hoped for, Victor nodded eagerly. His free hand was already on his cock, stroking his huge length as his lover's pussy went from something that could just about handle his entire length and girth to one capable of easily swallowing it up despite its vastness. Still it continued to grow. Still she continued to swell around the rear end, her ass and her upper thighs swelling alongside the intimate flesh of her pussy itself so that everything was held in place. The more Cynthia's nether regions grew and bulged, the more her facial expression was one of constant pleasure and lust. She wasn't just horny, she was frantic. Wild. She was being consumed by a cycle of pleasure and a growing, overwhelming need for pleasure that wouldn't cease. So consumed that as she came again, howling as ever increasing volumes of her ejaculate squirted out across the carpet and drummed against the base of the mirror, she wasn't even trying to look at herself in it.

That job, that privilege was now Victor's alone, and thus he watched as his lover panted and huffed in ecstasy, her clit swelling larger and larger in proportion with the rest of her increasingly thick, beautifully. immensely engorged nether regions beyond the size of a golf ball and closer to a baseball, slowing but not ceasing its growth even as that latest orgasm drew to what should have been its conclusion.

"I... I c-can't... ohhhgod..."

Though she was unable to finish that sentence, it was quite obvious what Cynthia was unable to do. She couldn't stop. She shuddered and clawed at the carpets more and more violently as her pussy continued to swell and alongside its growth her body continued to be wracked by waves of intense, obviously orgasmic ecstasy. Already her lips and the gaping interior of her vastly swollen nether regions were soaking wet with her ejaculate and arousal combined, but now as she continued to cum and cum, seemingly growing ceaseless in her orgasmic rapture, the lioness' pussy and her clit began to visibly drip with her juices, a constant river flowing from her as Cynthia's eyes rolled in their sockets, the quadruped cat less and less coherent as pleasure rendered even the most basic thoughts a struggle to compose.

Before long, Cynthia was as big as she had ever been. As engorged and overwhelmed as Victor had ever witnessed her at the absolute height of their use of Gro. Her pussy was so engorged and swollen that it practically dragged across the ground between her hind legs, a portion of her stomach's exterior having stretched alongside it and doubtlessly granting extra depth to that huge mass of intimate flesh which she now possessed. She was trembling, panting, heavy-eyed and out of her mind with constant ecstasy. And yet even now Victor could see her tail twitching with familiar impatience, and he could hear ragged snarls beginning to break through her panting and moaning as she fought to speak more than just plaintive calls of her own bliss.

"I... I w-waahh... I want you to... oh, V-Vic..."

She stared at him. At his thick cock clutched in the lion's hand, oozing pre-cum as he stroked himself oh so slowly. Victor was glad that he hadn't taken a dose himself, otherwise there would have been no way that he would have been able to hold back. To resist not just fucking Cynthia outright, but even to keep himself from jerking off, from cumming at the very sight of her losing control like this.

He stepped forward. Closer to her. Close enough to run a hand across the top of her head, the female feline purring and pressing her face against his touch.

"You want me to fuck you, don't you, Cindy?"

She shuddered happily as she nodded through another substantial moan of pleasure, her pussy now beginning to press more firmly against the ground as yet more of her lower body began to swell and provide extra girth, extra space for the interior as well as the exterior of her nether regions to spread.

"You want me to take my cock. This big, thick cock, and bury it in you. Make you cum. Because you know how it'll feel. You know that it'll be a million times hotter, a million times more pleasurable than anything you've felt so far. All this. All that's happened to you now... they're just the aftershocks. We've seen it so many times together with the regular Gro. We know how good it can feel. But we both know that it's nothing... absolutely nothing compared to the real thing. And that's not even considering how much better this might feel than back in the old days with Gro, is it?"

Cynthia shook her head, panting, shaking from head to toe, the very tip of her tail flicking urgently back and forth. Her cheeks were crimson beneath her fur, and as her eyes struggled to open even a crack to regard her lover, she gurgled loudly. The sensation of her clit, now close to a basketball in size, pressing down against the bedroom floor was growing more intense than she could handle. Every little movement she made sent the fibres of the carpet dragging across that hypersensitive nub, only now it was less of a nub and more a bulging, colossal sphere of infinitely sensitive and eagerly prominent nerve endings. She opened her mouth to answer Victor once again, but only an incoherent mewl escaped her lips. She licked them hungrily, staring with obscene longing at his cock, so big and so ready, dribbling pre-cum as her pussy doused the floor behind her with river after river of gushing, squirting ejaculate.

"Think of how good it's gonna feel, Cindy. How big you are. How much of me you could handle. God... I'll bet that if you got just a little bigger, it wouldn't just be my cock slipping into you. You could feel everything. All of me pressed between those hot, wet lips. I wouldn't be holding you. You'd be holding me. Pulling me in. A-and... god, I think I'd let you, if I knew it'd make you cum harder, and longer."

With every word he spoke of course, Victor knew what he was doing. He knew that he was trying to get the lioness to lose control. To get more and more worked up so that when he finally did fuck her, she would experience it to the heights that she truly deserved after having been forced to wait so long since the last time she had felt anything even remotely close to this good. He had done this to her dozens of times in the past, though of course back then tailored to the effects of regular Gro rather than the alternative. On those occasions either she had begged him to fuck her so convincingly that he had relented and done so, or she had simply pounced upon him, pinning him to the ground and straddling his body before riding the lion until he was drained and fatigued to the extreme. On this occasion however, perhaps fittingly for the first ever occasion of Gro++ being used in their lives and most certainly because of that new chemical's influence, a third option soon presented itself to both the horny lions.

Cynthia had been ready, primed and desperate to pounce upon the man she adored and ride him to ruin. But when she tried... she found her legs locked, and her forelegs, and indeed the more she tried to move and react, the more she found herself frozen, paralysed in her pleasure-stricken state. The pleasure was building again. Swelling towards yet another peak as her body continued to throb and convulse and grow amidst its drug induced bliss. Only this time, as she continued to squirt and spray her juices amidst guttural moans that were truly all she was now able to let loose, the pleasure kept on building. It, like her body, kept on growing beyond anything that she was used to feeling from the influence of Gro before. Beyond anything she had felt thanks to Gro++ so far. Not just a little beyond, but way beyond. Way, way, way beyond.

She trembled. She felt every muscle in her body tense up, and if her throat hadn't been amongst those muscles she would have announced to Victor in advance what she was feeling. What she now realised was about to happen not because she knew it for certain, but because if it didn't... if she didn't do what she expected to do next, she was convinced that her body was going to explode.

Although, in a way, that was precisely what it did do barely ten seconds later.

Cynthia roared. Not just a roar like those she had let loose thus far, but an ear-splitting, caterwauling shriek that echoed off the bedroom walls and made her lover take a step back in shock before bemused, stunned glee crossed his face once more. The lioness came. Not the kind of orgasm that she had been experiencing thus far, one that only fuelled her desire to greater heights, but the kind of orgasm normally reserved for after Victor began to fuck her. Cum, not the loose, liquid ejaculate that poured from the glands adjacent to her urinary tract but thick, sloppy white fluids that poured fourth in a single vast torrent from the depths of her vaginal passage itself brimmed over and out into the bedroom. The carpet, the mirror, the wall beyond its once clear, shimmering glass was doused in the thick, sticky mess of Cynthia's orgasm as she roared and shook on the spot, hind legs rooted still as her huge pussy bulged against and around them, throbbing and trembling in the purest, most intense ecstasy of the lioness' life.

" Yes!"

She had been screaming for goodness only knew how long by the time a word finally made it through, a coherent sound amidst her animalistic roars and snarls of pure elation.

" Yes! Yes! Don't stop... d-don't ever stop!"

She wasn't begging, she was commanding. Roaring her decree to her own body as Victor just stood there and watched her lose control. Thanks to the beautiful, utterly enrapturing distraction of her orgasm to end all orgasms though it did take more than a few seconds for Victor to realise something as he stared at her, no matter how focused he might have been on the beautiful quadruped lioness and her overwhelmingly erotic form.

She was still growing. Even now, as she began to cum and experience bliss on a whole new level thanks to SinTek's new product, she was still not at the end. Not at the absolute height. There was more still to come. More for her to feel. More for her to experience.

"O-oh... oh god, Cindy..."

Thus far Victor had been good. He had watched. Observed. Teased and tantalised his lover while maintaining the distance required to do as she had asked of him, to ensure that when this was over, if indeed it wasn't something they could engage in regularly, he would be able to describe with picture perfect clarity what Cynthia had looked like and how it had felt to be watching her. Now though he truly believed he had gathered more than enough information to enhance any future masturbatory or sexual fantasy in which his lover might wish to indulge. Thus, there was only one more job for him. And even if, as currently seemed to be the case, he wasn't at all necessary to make the drugged up and growing, bulging, cumming lioness scream in ecstasy, he would still try his best to make her scream louder. Longer. To ensure, just as she begged in her mindless bliss, that now that she had experienced this feeling it wouldn't stop until she was ready for it to do so.

Finally he broke from his position before her, passing by and around the trembling, huge lioness' form with one last stroke of her forehead with an outstretched hand. He groaned as at last he passed behind her and found himself no longer regarding her pussy in the mirror, now streaked and soaked with thick white cum-trails, and saw the vast, gaping organ for himself.

"O-oh god, Cindy..."

His cock throbbed urgently, and as he stepped into the huge, still spreading puddle of her cum, the lion growled with a level of passion and excitement that he hadn't felt since the last time he and the woman he loved had enjoyed their last Gro fuelled romp before its effects basically ceased to influence them. Of course, he had loved and cherished Cynthia and every moment they spent together in bliss or otherwise since then, there was no questioning that. But these feelings, these acts had always held a particular special place in both their hearts and their libidos, for obvious reasons. And now, even without Gro++ of his own to enhance things, Victor was delighted to be able to share that feeling with the lioness once again.

He dropped to his knees in the lake of cum behind her, groaning happily as a fresh wave of her continuing, copious ejaculations soaked his chest in her thick, sticky liquid lust. He crawled forwards, grinning as his thighs squeezed around her now almost beach-ball sized clit and the lioness howled in frantic ecstasy like never before. Grabbing his cock, already dwarfed by the sheer size and girth of his lover's engorged pussy, he guided himself to where he belonged as his ears rang with the ceaseless sound of his lover shrieking in pure ecstatic elation.

"Don't stop, Cindy..."

He purred deeply to his lover, even though he was almost certain that she wouldn't have heard him even without her screams echoing through the bedroom.

"Don't stop cumming. Don't stop growing. You've waited so long for this, baby... and now... o-oh god..."

He thrust into her, and groaned loudly as with that thrust his whole torso pressed against her vast, swollen, hyper-sensitive pussy, arms barely able to wrap themselves around its outer limits thanks to its extreme, impossible girth.

"...now I won't make you wait a single second longer!"

By Jeeves

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