Riko's Birthday Inflation

Story by bluebutter on SoFurry

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Birthday girl Riko gets the filling she never knew she wanted.


It was Riko's birthday in a few days and she had nothing planned. A cozy night in with her best friend Ryu? A night out with her friends? She could also stay home alone and play video games until she couldn't resist the urge to play with herself. She was up for just about anything.

The phone rang, it was Ryu, he wanted to take her out to a nightclub for her birthday. Skeptical but curious Riko agreed. the next few days passed as normal. The day had come, the two of them headed out. Ryu mentioned that this wasn't a normal nightclub and do you like glory holes? He was right this wasn't and normal nightclub, it was a nightclub for hypers. Riko herself wasn't a stranger to hypers in the least t didn't consider herself to be one, though her antics often leading her far down the hyper path. Currently shes been trying out a new supplement for penis enlargement and let's just say it worked. Riko has been dealing with a 4 inch diameter 18 inch long cock for the last couple weeks. Her grapefruit sized balls have always been on the larger size for her frame but the supplement didn't seem to enlarge them like it did her cock but she did notice an increase in cum production.

As they entered the nightclub there were only a few others inside. The main show floor had a large stage with a big wooden box sitting on it. It looked more like a scene from a magic show then a nightclub. There was seating for at least a couple dozen people. Wait did he say something about a glory hole?

Ryu lead Riko up onto the stage by the box and said yes, welcome to your surprise, i've rented out the whole club tonight and set up a show starring you, all you need to do is stand in this booth and enjoy. He lead her around back where there was a door on the back of the box.

Riko stepped into the booth. It was not much larger then a standard bathroom stall but a bit wider. There was a hole in the far wall at the perfect height for her. Taking a peek she could see most of the main show floor on the other side of the wall through the hole. There were already a few people walking in behind them and finding seats waiting for the main event to start. The wall was thin but sturdy with a soft touch to it. There were hand grips and chains attached to the ceiling and walls. Riko walked up to the hole and pulled out her cock. Immediately she noticed a problem, the hole was nowhere near big enough to fit her cock through, she must have grown a bit since Ryu was last able to measure her. Ryu gestured to the staff who promptly sent out a crew to enlarge the hole, about a half hour later it was ready.

Attempt two, Riko walked up to the hole and shoved her cock through, it was now a perfect fit. She could hear murmurs of people talking as she pressed her stomach to the wall, her mostly flaccid cock fully on display in the other room.

From behind her Ryu began to tie her hands up one at a time to the chains on the ceiling. A belt was placed around her waist and attached to the wall preventing her from being able to back away from the wall.

As Ryu finished up he whispered in her ear hey, happy birthday, i hope you enjoy this fulfilling experience. I will be honored to be your first customer. He slapped her ass which jiggled from the sudden impact as Riko let out a small yip in surprise. He then left and closed the door behind him. locking it from the outside.

it wasn't long before she started to hear sounds of an announcer and cheers from the crowd, sounds like it's a full house tonight.

The announcer went on introducing Riko and different promotions the club had going on. Riko could already feel herself leaking pre in anticipation. She kicked the wall with her knee causing her balls to swing and bump into the wall. The announcer, noticing the commotion from behind him, loudly pronounced let's get started it sounds like our birthday girl is getting impatient.

As promised Ryu stepped up first. Firmly grabbing massive cock sticking through the wall. He started stroking it, not even able to get his fingers all the way around it as he pulled out his own cock with his other hand. the unseen attention exciting her, as her cock grew harder and straighten out. Ryu's own pailing in comparison to Riko's enhanced size. Gently at first Ryu pressed his tip against Riko's opening began to apply pressure. As he pushed his member sank deeper into Riko's length, the soft outline of his member barely visible along the length of her cum tube. His length covered in her pre making for great lubrication.

Using both hands now he stoked her length, he could feel his own massage through the throbbing walls of Riko's cock turned living onahole.

Several deep thrusts later He managed to hilt his entire cock inside her member. The tip of Riko's cock pressing into his stomach, his cock only managing to reach a respectable half way down her length.

Riko could feel every heartbeat, every twitch from her best friend inside her cock, stretching her opening. She wiggled in pleasure what little she could with the restraints holding her firm. Beads of fluid dripping from her sex landing on her balls and soaking into the soft fur. Trails of leakage running down her balls revealing her deep purple undercoat.

Several thrusts later Ryu once again thrusted deeply into her cock and started releasing a flood of hot cum. with nowhere else to go it shot directly down her length and into her balls. every pulse of thick hot cum massaging her passages and mixing with her own. Her balls began to feel heavier and fuller, bloating larger with each passing moment. Her grapefruit sized balls now looking more like large softballs but much heavier.

Ryu eventually finished emptying his balls not letting a drop escape. He pulled out with a loud pop as their members separated.

Leaving no time to waste another male stepped up and took his place. A well endowed tiger with am already pre soaked cock. Shoving his length all the way in one quick motion. Riko was surprised by the sudden, much larger intrusion, her eyes rolled back and she let out a loud moan that could easily be heard in the other room. The tiger was rough thrusting hard and fast. The extra motion causing her balls to repeatably smack into the wall.

With no warning the tiger let loose cumming with force deep inside her cock further bloating out her balls. Riko quickly rose to her first orgasm of the night but the large tiger had other plans, her own ejaculation not strong enough to overcome the tigers force as her balls swelled larger with the cum not being able to go anywhere else. She felt so very full, she could not see below with her breasts pressed tight up against the wall to see how big her balls were but she could feel her knees weakening as she needed to start spreading her legs apart to accommodate her growing sac.

She didn't know how much time had gone by but she heard the announcer announce times up and the tiger had ran out his clock. She could feel him start to pull out but he stopped short as something was clamped around the base of her cock squeezing it tight, acting like a one way valve. The tiger then pulled the rest of the way out with a small dribble of cum flowing out of her tip, the clamp holding everything else back as her opening gaped wide, the cool air tickling her sensitive flesh.

The next several participants were a blur as the pattern continued. Treating her cock as a fucktoy, continuously unloading their loads into her, filling her more and more. it wasn't long until her balls reached the size of basketballs, then beach balls, then yoga balls. Riko's knees gave out, no longer able to support her extra weight. Lucky for her the restraints held her in position not moving much at all. Her balls stuck pressed up between her legs and the wall still growing larger from her own denied releases. She felt the cool floor on her sac which sent a tingle through her spine. Her cock still hard as ever as she continued to get fucked relentlessly by the crowd of people. She soon found herself being lifted off the ground by her own balls now starting to press up against the sides of the booth. The pressure inside steadily growing. A few more rounds later instead of feeling another cock enter her own she felt something soft and warm running along her length, licking and expertly teasing her sensitive glans. It was a welcome break from the stretching of her cock slit, not that she wasn't enjoying that either but it was also nice to give her aching balls a break. The licking went on until every inch of her cock was coated in warm sticky saliva several times over. She felt a warmth spread from her tip as something began to swallow her member taking the long length deep inside. Every contraction of the anonymous throat sending her a jolt of pleasure. The deeper it went the tighter, and better it felt until she could feel hot steamy breathing coming through the hole right onto her crotch, it must have taken her whole length in. Her tip must have reached all the way to it's stomach. Then it started thrusting in and out slowly at first but then picking up speed. The tight pocket caressing every inch of her cock, tongue gliding along her cum tube.

Distracted by the attention her cock was getting on the other side of the wall she almost didn't notice the door behind her open and someone enter the small booth behind her. She tried to look back to see who it was but was unable to turn around far enough. Your balls are so big this is going to be a bit more challenging then I expected but we'll still put you to use came a voice from behind her as they grabbed her shoulders and started to sit on her balls that were now expanding out behind her. The extra pressure inside her sac making her beg for release even more. She could feel a cock pressed into her lower back, hot and leaking pre. The man behind her moved his hands to her breasts, fighting for space between the wall. With a little effort he pressed his cock up against Riko's tail hole and slid inside. The sudden attention to her backside combined with her cock being deep throated on the other side of the wall and her breasts being aggressively fondled immediately put her over the edge into another series of orgasms bloating her nuts even larger with her own production.

The sucking on her cock eventually came to an unfortunate end as another cock was once again stuffed inside her urethra. This time it was a wolf. He was larger then the previous users, and it he spent most of his time thrusting, stretching her open. His knot proving to be a formidable challenge for her cum slit to overcome but eventually it did yield, his knot forced inside, he thrusted a few more times for good measure all the way to the base of his cock each time. On his last thrust she felt his cock deep within her own pulsating vigorously as his knot started to inflate further sealing them together. The immense pressure bulging the tip of her cock out, you could clearly see the outline of his inflating knot through their conjoined cocks. A surge of warmth inside her backside brought her attention back to her tail hole as hot thick cum burst deep into her ass. The belt around her midsection getting tighter as her belly started to slowly expand. The flow gradually slowed to a stop and the hands on her breasts have one last squeeze and let go, wrapping around to her back and pushing off, the cock in her ass came free and the weight of her rear visitor rise off her nuts. Before much cum could spill out she felt more hands on her shoulders and 2 more patrons sit down, one on each nut. Each one a bit lighter then the one that came before but still causing her balls to squish out pinning her legs to the sides of the booth. The pressure inside still growing but unable to escape with the cock ring still in place. Every orgasm noticeably adding to their volume, pressure and production.

A flood of hot cum entering her urethra traveling through her plumbing and straight into her balls only made them bloat out faster, the walls of the booth starting to creak against her balls. She felt two warm pairs of breasts press into her back as arms wrapped around her caressing her expanding figure. The two figures wiggling around trying to get in position as she felt another cock enter her backside. it was quite a bit larger then she was expecting, it had to be at least 2 inches in diameter, much larger then the one before. The small visitor being well gifted for her size. Seconds later she felt another prodding at her tail hole, she mewed shaking her head from side to side as the second cock slipped inside stretching her anus widely, taking both of the 2 inch wide cocks at once. The wolf was still cumming into her front side when the two in her ass started pistoning in and out of her, when one thrusted in the other was pulling out. 14 inches of thick cock picking up speed as the 2 found their rhythm, their large balls dragging atop her own. Each thrust causing a pulse of shifting weight, the pressure flowing back and forth between her nuts. Stiff nipples and supple breasts rubbing against her back ruffling her fur. There were no idle hands but her own as the others massaged her breasts and balls. It was becoming more and more difficult for the two working her tail hole as her balls grew and pushed them up higher, obscuring her ass. She did not know how much time has passed, she felt many pairs of hands start to touch her cock. She could feel the wolf still cumming at full force as was trying to pull back but his knot locked the two together and it did not budge. She felt the hands on her cock try and stick their fingers in her urethra hoping to widen the opening large enough to release the wolf. Riko hadn't been listening for some time, lost in bliss and her own constant orgasms but she heard shouting from the other room.

The wolf had overstayed his turn and was either unable or unwilling to separate. His basketball sized nuts gurgling loudly, churning out new cum almost as fast as he could release it. Both of her rear visitors hilted as far as they could together into her ass as they released their loads. Her stomach rounding out more and more, pressing harder into the wall spilling out to the sides as the belt strained against her soft expanding flesh. She felt like she was pregnant with a full litter just from the amount of cum being pumped into her ass. Her balls under so much pressure from the constant influx of wolf cum and her own overproduction she felt like there was a truck parked on her nuts.

The fullness was intoxicating and unbelievably pleasurable. she was moaning incoherently, trembling, shaking the chained restraints that instead of suspending her from the ceiling were now rather loose as she was lifted up but her now close to 5ft diameter balls, taking up every inch of the floor space in the booth. The flow of cum from the wolf finally started to slow after uncounted gallons of seed were released into her. His knot starting to loosen up as the many helpers were finally able to separate the two. Her cock gaping open several inches with a small stream of pre and leftover wolf cum dripping out. The two herms in her ass eventually let up as well and one at a time slowly pulled out with a loud schlurp as her anus tried to hold on to the intruders, cum leaking out from under her tail producing a thick gooey stream that flowed down onto her balls, pooling up by her backside and eventually flowing onto the floor soaking her fur all the way down. The two left the room carefully rolling across her balls and out the door without anywhere else to step. Ryu appeared in the doorway. Riko only knew it was him from his familiar musk she could smell from behind her. Ryu looked on in excitement. Wow you got really big, we had no idea what that wolf was still cumming until his time was up, he really filled you up he said as he crawled onto her sac and started to undo her restraints. The belt not taking much persuasion before it snapped releasing her belly. Seeing as she was still unable to move Ryu arranged for a special guest to help her out.

While Ryu undid her restraints the walls around her began to fall as the booth around her was deconstructed by the staff. The wall in front of her separated down the middle and she could finally see the audience. Many cheered and wooed as she spilled out from the temporary structure. Taking up much more floor space now that she didn't have walls containing her. With her balls mostly behind her she was able to roll forward and get her feet on the ground, knees still weak leaning back on her sac for balance. From across the room a short rabbit stepped forward, fully nude, brilliantly white fur. Her entire torso only slightly larger then Riko's cock. Multiple large pairs of round swollen breasts hung from her chest and abdomen. Her sex was glistening in the bright stage lights, thighs soaking wet. She introduced herself as Astra, the clubs foremost breeding queen. Astra walked up and ran her paws along Riko's member, feeling, measuring, kneading it's flesh. I haven't had a cock your size in a while, but your capacity on the other hand... as she moved to examine the stage filling balls. I have never seen a non hyper so large. She pressed a paw into the side of Riko's nuts pressing into it like an overfilled water bed. She could feel the currents inside flowing, churning moving around searching for any exit of could find.

As the rabbit claimed sole use of Riko's cock, she waived to everyone else the can do want with the rest of her. Everyone rushed up to get a paw on her. Some caressing her breasts and bloated belly, licking her nipples and fingering her sex. Most others massaging her nuts and licking up the trail of sweet tasting fluid leaking from her tail hole. A few who did not get a turn earlier crawled up and started fucking her tail hole. All this attention from at least a dozen or two visitors was overwhelming. Riko could no longer speak normally, her moans and heavy breathing taking over.

The rabbit moved into place and stood on a small platform positioning herself over Riko's cock. Her sex almost level with Riko's muzzle, she could smell the rabbits thick musk. Riko leaned forward and pressed her muzzle right into the rabbits crotch taking a deep breath as she lapped at the swollen folds drinking the sweet fluids produced within. Azure stood there for a minute fondling one of her breasts and grinding harder into Riko's muzzle, enjoying the moment as Riko begged for release, her cock going untouched was driving her mad as she bucked her hips, causing her cock to swing up and down slapping the rabbit in her backside with a wet splat. Riko could feel her stomach swell a few inches larger as someone put another load in her ass, crawled away and another took his place.

The rabbit climbed down off the platform leaving a thick rope of bunny cum between the two. She jumped down and landed on Riko's cock, bouncing a bit as her cock yielded to the newly added weight. Azure wrapped her legs around the member squeezing tightly with her powerful thighs and started sliding forward and backward rubbing her clit along her length. Each fold and throbbing blood vessel rubbing across her clit sending a jolt of pleasure into the bunny causing her to clamp down tighter still. Riko was leaking a pool of pre out her gaping urethra, the clamping device still installed at the base of her cock. Another surge of cum entered her belly as Azure bumped into the newly further expanded stomach protruding out into her space as the amount of thick cum pumped into her backside made her look like she was 11 months pregnant, with a double litter.

A large alpha dog who didn't look to be present at the beginning of the show waled up on stage next, just as another load was pumped into her ass the alpha cut the line and climbed up onto her sac next. He ended up straight behind her laying down on her balls stretching his legs out around her own. His own beach ball sized balls getting lost between her own. The alpha looked to rival Riko with the size of his cock reaching 16 inches long and 4 in diameter. Riko's well stretched tail hole accepted him with only a small bit of effort as he started thrusting hard and fast. The outline of his cock bulging out sightly from her cum filled stomach. Azure leaned down and stuck her face up against Riko's tip, drinking up the flow of pre, her row of swollen breasts straddling Riko's cock as the bunny started moving again. Her hot heavy breathing blowing hot air down Riko's length. Riko Shuddered as she experienced orgasm after orgasm again and again, her own production still not letting up forcing new cum to fill her balls. The rabbit leaned back pressing her cunt against the swollen belly behind her. She rubbed up and down until she found the spot where the alphas cock was thrusting up from behind, pressing harder into the spot. The rhythmic thrusting of the alpha's cock through Riko's stretched stomach wall providing enough stimulation to her sensitive lips to cause her to leak even more fluids, now dripping down the sides of Riko's cock and further soaking her fur revealing more and more streaks of bright purple fur.

Several minutes of this went by before anything new happened, everyone in the room paying attention to her swelling expanding form as she was stimulated from every angle, some of the crowd standing back stroking their cocks or fingering themselves, showering her in more cum.

The alpha's cock started to grow hot and began to throb inside her ass, his knot growing wider as he thrusted it in and out a few times before it fully expanded over 6 inches in diameter, her tail hole snapping open and closed as it passed through. He pulled out a bit, while continuing to thrust as to prevent his knot from getting stuck. His balls started to churn and grow as he flew past his limit. Each powerful surge of cum impacting the front of Riko's stomach from inside with such force that the rabbit could feel it through her cunt. Every jet adding another inch to her waistline. the rabbit ground her cunt even harder against the jet of cum inside Riko's stomach. not wanting to wait any longer she took one more big slurp of pre and planted her paws into the platform below and with her ass in the air, she positioned her rear paws against Riko's shoulders and gave one large shove.

Riko lost her balance and she rolled back onto her balls, her legs losing what little contact they had with the ground. Her cock swung straight up catching the rabbit in the process. As she rolled back she pinned the alpha dog between her ass and balls forcing his cock the rest of the way in and after a second of incredible resistance, his knot slipped inside with loud wet pop.

Her balls shifting their thick fluid contents as their weight moved around. Once Riko found her balance again laying back on top of the alpha and her 8ft diameter balls the rabbit crawled up on top and started to lower herself onto Riko's spire. She ended up sitting on top for a few moments dripping more and more bunny cum adding more lubrication as she was surly going to need it. Her cock was at least as wide as the bunnies thighs and longer to boot but the bunny continued to press harder bouncing up and down pressing off of Riko's swollen and growing stomach. Her many swollen jiggling breasts starting to leak milk in anticipation.

The bouncing stopped as the bunny sank down several inches, she could feel her cock surrounded by an intense pressure, looking up at the bunny, she had a cock shaped bulge up her front side between her rows of breasts. Azure's eyes rolled back in her head as she let out a moan rivaling those from Riko herself, but she was not done yet. Wiggling back and forth she managed to slide a few more inches down taking in about half of Riko's length.

Riko's stomach was still filling as the alpha continued to cum, pinned in place and unable to pull out. From a far it might have looked like Riko was laying on a water filled bean bag pregnant with multiple litters. Someone started to turn some knobs on the clamp on her cock and it released and was removed. There was nothing that could stop her now. Azure braced for impact. Her womb ready to start a new litter or dozen by her estimations. Riko bucked her hips violently as the first jet shot up her length, her cum tube bulging out. The flow only being restricted by the bunny's tight cunt squeezing down on her cock causing the molten cum to shoot out with increased pressure right into the waiting bunnies womb. Instantly filling her cavity, flowing into her tubes and saturating her egg factories. the second jet was instantly visible as the bunnies womb expanded trying to contain the flood, bigger and bigger the bunnies belly expanded quickly outgrowing Riko's own still growing stomach in just minuets.

As the bunny expanded and her weight increased with cum she slid further down onto Riko's cock. By this point Azure was more cum then bunny but she continued to grow. Her breeding DNA kicking in causing her ovaries to go into hyper drive producing dozens of eggs every minute and releasing them directly into her flooded fertile womb. Riko's balls had only just started to shrink but there was still much to come.

The alpha spreading his arms out trying to push Riko off of him but it was a losing battle. He was still hopelessly stuck jammed into her ass and balls still churning out thick new seed. Some time later Azur's womb still drinking up every drop, approaching over 6ft wide now, she slipped back impaling herself further onto Riko's cock. She could feel her butt pressing into Riko's stomach as her cunt swallowed the entire cock, pushing her insides out of the way as it reached all the way up between her upper pair of breasts, she could feel Riko's soft wet fur brushing against her clit. Riko only gained extra satisfaction feeling every speedy heartbeat from the rabbit on the tip of her cock as it pressed deep inside her.

Suddenly Riko started to tip forward again the now grotesquely swollen bunny impaled on her cock combined with her own stomach holding at least 100 gallons of rich alpha cum was heavy enough to slowly allow her to stand back up. This time she was very front heavy and leaned forward onto the bunnies stomach which spread out over 8 feet, pulling her balls up sightly behind her. Her own belly resting on the backside of the impaled bunny.

With the help of some of the crowd, the alpha was finally able to pull his cock free from it's bloated passage followed by a torrent of cum flowing out of Riko. The sudden shift and decompression of her tail hole causing her much pleasure and a huge mess as cum flowed down her balls. The alpha was still shooting out cum but at a much lower rate then before as his orgasm started to wind down. He was dragged offstage and to a recovery room. Riko continued cumming for over 10 minutes. Her stomach only shrinking down to the point where she looked very pregnant with a large litter. Her balls emptied out until they were about small yoga ball diameter. Small enough that she could walk again but large enough to make walking difficult.

As for Azure, she would not be walking anywhere for a long while. The sheer volume her womb was contained was staggering as the bunnies small frame had stretched over 12ft wide across the floor she could feel hundreds if not thousands of eggs taking root inside her all instantly fertilized. Excess cum had started leaking out around Riko's cock releasing some of the pressure. Slowly Riko began to back up and pull out of the rabbit. Despite the pressure within, there was much resistance as some of crowd began to help. As soon as she was free a fresh gush of cum flooded the stage as the bunny started to drain out. Riko started to pass out, her job was done, her knees weak, and her body full and satisfied, Ryu caught her, or to be more accurate broke her fall as she was much heavier now. Azure, still babbling and writhing in pleasure eventually draining out most of the thick sticky cum but she knew it wouldn't be long until she returned to that size again but this time full of babies and she wouldn't have it any other way.

On their way out of the club Riko managed to mumble, let's do this again next year.