A Major Miscalculation

Story by Ralleign on SoFurry

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Alphys decides to prepare a special surprise for her special someone, but fails to take into account one minor detail.

First story finished in a long time, and ho, boy was it a difficult one. Think I'll try sticking to single orgasms until I get the hang of this more thoroughly.

Special thanks to Daemont92 for inspiring this idea, and to Ironwingvi for all the support and help coming up with ideas to keep this interesting. (both on Furaffinity)

Characters belong to Undertale, which is made by Toby Fox. As always... I'm very sorry for this.


"Fffffwoooossshhhhh...

Ffffffwooooooosssshhhhhhhhh....."

The sun began to dip below the horizon of the glimmering sea, waves gently lapping at the sand, the dull roar of water droplets cascading against water droplets echoing across the beach. Staring at this scene, a rather pudgy, yellow-skinned triceratops, dressed in naught but a rather old-fashioned two-piece swimsuit and carrying diving goggles shivered nervously at the thought of the endeavor she'd planned.

Dr. Alphys--that was the dino's name--had slight fear and doubts about her current plans. After all, it was a crazy idea, waiting at the bottom of the ocean for the love of her life to pass by, hoping her lungs would last long enough, all to give a very special, and very sexy surprise to her fishy lover. But, it was a calculated risk. She'd known Undyne--that was her love's name--always came to the ocean after work for a relaxing swim. And, she'd be ending work right about now. She even knew down to where Undyne would be swimming within the ocean and the best place to surprise her. Yes, Alphys knew Undyne very well.

But, it wasn't always like that. There was even a time she had no idea Undyne was so into the thought of underwater imperilment. There was many a time the two would go swimming together, only for Alphys to "mysteriously" get caught on something, or to "accidentally" swim too deep to surface on her own. Luckily, though, rather than get angry or frightened her lover was trying to drown her, the dino only found herself growing hornier and hornier every second she was without air. As her head would grow dizzy with oxygen deprivation, without fail her survival instincts would become overwritten by her desire. She definitely counted it as one of the perks of having a fish woman for a lover.

Alphys suddenly snapped out of her thoughts when she realized she'd been rubbing at her folds through the swimsuit, the fabric beneath her fingers feeling rather... wet... Alphys gave a nervous giggle as the realization also dawned on her that she'd very easily lose control at this rate. ...But, that was for the better. Finally deciding further thinking would only increase her chances of being discovered by Undyne, and thus spoiling the surprise, the dino reached down, starting to tug and pull her swimsuit off, then laying and burying it in a hole in the sand she'd dug earlier. She could stand to lose another swimsuit. She knew to have many on hand.

Finally, she was ready to head out and lie in wait. Her swimsuit was well hidden, and she began taking deep, fast breaths to prepare her lungs for the dive ahead. The waves began lapping at her toes as she stepped out towards the water, hungry for more of the dino. And, she was willing to give herself, wading out further and further, the warm-feeling water engulfing her feet, engulfing her knees, lapping at her pussy and causing low, heated moans to escape her lips. 'Not yet,' she thought. 'You'll have better pleasures out further.' Further out she waded, dipping her single-frame diving goggles in the water, wetting them up properly, then sliding the strap over her head, securely suctioning the edges to the contours of her face. She loved how snug they fit her head.

Deeper and deeper still, her slow progress continuing on. The waterline slowly rubbed along her chubby belly, lapping at her tits, slowly causing her breasts to begin floating in the water. Before long, her soles could no longer touch the sand, and so she kicked off, treading the water, doggy-paddling out towards deeper and deeper waters. Finally, she gave one last gaze back to shore, the details hard to make out from out here, and judged it to be the perfect distance.

Her breathing sped up, getting to the point of hyperventilation. Her head angled upwards, her kicking and treading the water maintaining a steady pace to keep her mouth out of the water. Minutes passed like seconds to her, her fingers and toes beginning to tingle, her face feeling cold, even in the summer heat. As her head grew light, she gave one last, powerful stroke and sucked in a huuuuuuge breath, "HUAAAAAAAAGH!" and sank below the waves, curling up a bit and closing her eyes tight before slowly opening them, looking around and relaxing.

Her lungs almost felt satisfied to no longer be taking air into them. It was as if her body had begun to accept her love for the water. Using this thought to bolster her courage, Alphys angled her body downwards, soles pointed upwards to the waning light, and kicked and pulled downwards in slow, practiced motions. She kept a tight hold on her air, only tiny bubbles escaping from her nostrils. Before long, her hiding spot came in sight: a whole field of seaweed, planted within the ocean floor.

Her time spent with Undyne had indeed strengthened the dino's lungs. By now, she was able to hold her breath at least 6 minutes with the proper preparation. But, she was still an air breather and feared her whole plan would go up in smoke from her urge to swim up for air. However, this field of seaweed was perfect to counteract that. Alphys reached out, grabbing a handful of seaweed and pulling herself downward with it, finding its strength adequate. She reached down, tying the handful of strands around her right ankle, then grabbing another handful and tying it around her left. She was really good at tying knots. Really, really good.

After that, Alphys took a moment to admire her handiwork, giving a soft giggle when a few strands slid between her toes, tickling them a bit. "Bl-heblheglbl..." A pink blush formed, threatening to engulf her cheeks, to turn her normal yellow color to a soft, uniform pink color. It was more than the embarrassment of tickling herself... She was beginning to grow horny again. Was it okay for her to pleasure herself now? She cocked her head to both sides, surveying her surroundings. No sign of Undyne, seemed she was a bit early. "M-mmbl." The dino let a soft grin spread along her maw. After all, her plan was to be a damsel in distress, trapped so deep underwater. Who says she can't have a little fun waiting for her knight in shining armor to come rescue her?

...Did she even have to debate? Looking down, it seemed her fingers had already decided while she was mulling it over, sliding slowly down her chubby belly, reaching for those puffy folds which ached for her to play with them. "M-Mmblbl." Her blush only grew brighter, her body feeling heated and tingly. Her folds pulsated constantly, _demanding_she touch them. And, she did. Oh, how she did. The very moment a finger brushed against them, it sent a burning wave of pleasure coursing through her body, her legs kicking out and stiffening, her back arching and a long stream of bubbles forced from her maw. "Oooblublooglurble!"

The dino immediately tried to contain herself... but, she'd lost control. Before she could get a thought out to the contrary, her fingers plunged deep into her pussy, wrenching her jaw wide open, forcing out a long, loud scream into the water, "AAAGLUBLAAAAABLAABURGLAAAAGHL!" Her free hand immediately shot up. At first, Alphys thought she'd involuntarily grip her neck, but to her delight, she'd grabbed and groped her breast... tight! Her pink blush quickly turned a darker, fuller shade of red, spreading along her whole muzzle, her eyes bursting wide open, pupils shrinking. Her toes splayed out as her feet kicked constantly against the seaweed that anchored her down to the bottom.

Her hips humped and thrust hard and fast, her fingers plunging deep, massaging at every corner. In her mind, she imagined them being the deft, hot tongue of her one true love. Bubbles poured incessantly from her wide-open maw, her tongue hanging out, tasting the salt water. Her whole face flushed beet red, humping faster, faster. "WAAGLAAGURGLBLAAAABLGLUBAAAAAAGL!"

Finally, she hit her peak, her whole body stiffening, one last shout echoing through the water as her fingers plunged deep inside her, her folds practically exploding with her juices gushing out into the ocean, clouding the water around her waist, her legs, and her chubby tummy with her white, hot juices. Her head tilted back, her wide gaze fixed upwards at the surface as her bubble trail tapered off, her chest significantly less inflated than when she started the dive.

Slowly, the dino began to relax, sliding her fingers out of her pussy, relaxing her legs and only lightly gripping her breast. She began to sink down into the field of seaweed, her eyes and maw slowly closing, tiny bubbles popping from her nostrils. She'd no idea how long she'd been under. She'd no idea how drained her lungs were. All she felt was that intense afterglow from such an intense orgasm, sending small, pulsing shivers along her body. She was highly content, but in the back of her mind she believed she'd be more content with a certain fish woman with her. And, in the deepest part of her subconscious, she began to wonder where Undyne was.

"WAAAA-CHOO! DAMMIT!"

Somewhere nearby to the beach, a traffic jam had accumulated, and a powerful four-wheeler belonging to a certain fish-lady had sat motionless. Undyne had finally stopped wailing on her horn, finding it a useless endeavor to get traffic moving. In her mind, she debated simply flooring it, ramming any car out of her way, but decided against it. No way would she be allowed to keep her license after ANOTHER incident.

At this point, she'd grown defeated, slumping against the steering wheel and letting out an exasperated sigh. A part of her wanted to just give up on the swim today. After all, the sun was already setting and she'd still not reached the beach. But... well, it was hard for her to explain to herself. She had this feeling like she HAD to go to the beach today. Some strange feeling of... dread? That seemed like the right way to describe it. Like some unknown dread that cancelling her swim today would be a really, REALLY bad idea.

'Oh, well...' she thought to herself. 'I just hope Alphys is okay waiting for me.' Right. Alphys. Normally on Tuesdays they'd sit together and watch anime, but out of the blue her dino lover had called and said she'd be too busy tonight, and wouldn't even be home for a while. She seemed nervous over the phone, but then again, she always seemed nervous. That is, except for when the two were swimming together.

But, it wasn't always like that. There was even a time she had no idea Undyne was so into the thought of underwater imp- "Oh, son of a bitch..."

Already, the thoughts of the dives the two would spend together was making Undyne horny. Thankfully, this time she'd caught herself rubbing her folds through the thick fabric of her jeans early into her musings.

...Then again, it wasn't like traffic was moving, not at any quick pace, anyway. Undyne had a look around. Seemed most drivers weren't too focused on the road. And... no one was looking at her... Her eyes scanned along the cars near her. Most had their windows down, but were focused ahead... Wait a second... "O-Oh, my..."

Up ahead, just a bit to the right, she caught a glimpse into one car, and noticed the driver, clearly male, looked like a wolf of sorts, already had his own pants undone, a pink, throbbing length pulled out, with a large, strong paw gripping and slowly stroking up... down... up... down... The sight brought a soft blush to the fish lady's cheeks.

Well, that settled it. If that wolf was brazen enough to do it, then so was Undyne! Still, she rolled her windows back up as a precaution. She closed her eye only a moment, visualizing the sight of her sexy dino girl sprawled out across the bed, buck naked, with flowers strewn about, teasing the fish, guiding her onto the bed. Slowly, Undyne reached down, unzipping her jeans, slipping a hand down and under her panties.

The image in her head slowly transformed, the thought of Alphys, floating in the water, tongue hanging out and bubbles continually flowing from wide open lips that slowly became painted a deep blue color. Oh, god, what she wouldn't give to see that right now. It drove her fingers on, their slender length slipping past her folds, deep into her pussy. She let a soft moan vibrate through her truck, pushing in deeper slowly, slowly. She imagined that cute, chubby dino sucking in a deep breath of water, coughing up water, grabbing her neck, but still faithfully exhibiting her naughty bits to Undyne. All for Undyne. Oh, god, it was so fucking se-

"BWAAAANT!"

"SHIT!"

Undyne quickly forced her eye open. Ahead, the cars were beginning to move, and behind a line was being held up by her. The fish lady's cheeks flushed in embarrassment, quickly shifting into drive and driving ahead, zipping her pants back up as she went. ...Fucking traffic...

"Mmp!"

Alphys' eyes popped open, her hand returning to her chest as she felt it heave slightly. Her cheeks puffed out, still flushed a deep red, but this time it wasn't from pleasure. Her lungs felt empty! Immediately, the dino kicked off the ocean floor, swimming for the surface... only to stop short, her ankles grabbed and held down by the seaweed! "Mmnbl!"

Her gaze shot down, seeing that seaweed wrap around her ankles, between her toes. She quickly bent down, squishing her chubby stomach and grabbing at the seaweed, trying to yank it free. But, it wouldn't budge! She'd done TOO well a job tying it!

Her chest gave another contraction, her hands flying up to cover her maw, though bubbles still leaked through her fingers. "Mnnblblbl!" Her eyes squeezed shut, her flush red cheeks were slowly turning a soft purple color with the lack of air. Finally, the realization dawned on her: she was going to drown! It... It... It felt so damn arousing to her to think this!

Her lips slowly curled into a smile behind her hands, her eyes slowly blinking open. For a while, she wondered why everything looked so blurry. Looking around, she figured out her goggles had filled with water. Stifling a giggle, she reached a hand up and yanked them off her face, now every inch of herself exposed to the open ocean.

Slowly, she brought her free hand down to her heaving chest, feeling how it made her breasts bounce every time it contracted, eliciting a soft, stifled moan. "Mmnglbl..." She gripped one bouncing orb, bringing a finger over to trace and rub at her nipple, moaning out a bit more into her hand. "Nnmmmgl!"

It was making her so hot, so horny to be so airless. Her head was starting to spin, her thoughts confused in a drunken, airless haze. Without much more teasing, she finally released her maw. After all, she was already going to drown, why hold it off? Her cheeks puffed out even more, her maw staying shut as bubbles leaked constantly from her nostrils. Her newly-freed hand trailed down her stomach, again plunging straight into her folds, her maw opening and spilling bubbles out into the water again. "Bl-BLAAg-Gllb-blgl!"

Her fingers pinched and molded her hard tits in their touch. Before long, they moved to a steady rhythm, feeling much like a certain fishy lover suckling them, causing a bit of a white, milky substance to leak. Her other hand plunged deeper and deeper into her folds, massaging all over her moist walls, spreading her pussy lips to invite the sea water to penetrate her deeply. The stimulation was too much for her body to take, her head jerking back hard, loud shouts and moans echoing through the entire depths, her tongue hanging as far out of her mouth as it could, eyes rolling upwards to the surface, so far away now. "Glb-BLAA-G-GLAUBUR-gl-glUBLUGH!" With one last plunge of her fingers, that electrifying surge of orgasm shot through her spine, forcing out one last, long shout as her love juices spread out into the water once again, murkying the depths around her even further.

Her body held stiff in the post-orgasmic afterglow. Her eyes remained wide opened, pupils shrunken to fine points, her maw wide open and flooded, her cheeks showing a dark blue coating to contrast her natural yellow color. Her toes were splayed out, each wrapped in seaweed that extended up to a tight, almost squeezing fit around her ankles. Only tiny bubbles leaked from her open mouth, her lungs practically empty at this point, begging for a breath, though it was a plea the dino hadn't heard. Her mind, in all practicality, was gone, lost to a haze of bliss and suffocation. Like this, she slowly floated towards the bottom, her heart pumping like crazy to keep her conscious.

"Fffffwoooossshhhhh...

Ffffffwooooooosssshhhhhhhhh....."

Even through the night, the sea continued its assault on the nearby shore. Once reflecting the golden-orange rays of the waning sunlight, the water's surface now reflected the pale blue rays of the moon, light dancing like the stars dotting the sky. The fish woman, Undyne, dressed in her own smooth one-piece swimsuit, was somewhat thankful she had been late if it meant witnessing such a scene before her daily swim.

Slowly, Undyne took to stretching a bit. Once satisfied with that, she gave a nod, sprinting full-tilt towards the water, but suddenly stopping short when her foot kicked up something that... definitely wasn't sand. Slowly, she treaded back, examining what looked like some discarded clothing. It only took her a few seconds after shaking out the sand to recognize it looked a lot like Alphys' current pair. But why would... "Oh, no."

Undyne didn't know a whole lot. The surface world wasn't like anime at all. Violence hadn't solved all her problems, much as she wanted to try. But, if there was one thing she DID know, it was Alphys. This wouldn't be the first time that cute dino would hide underwater to surprise Undyne. But... how late was she? How long would Alphys have been under? Without further thought, she quickly bolted for the water, not even wasting time to slip her own swimsuit off, as she normally would.

"...."

"..........."

"....Ghup!"

The dino suddenly jolted awake from her stupor, her eyelids, once drifting, now bolted wide open to bare her shrunken pupils again. Her first gulp of water had sent a burning sensation down her throat, straight into her tired, empty lungs, setting them ablaze with that salty sting. Her hands flew up to her neck, her body instinctively curling as she went into a coughing fit, forcibly expelling the water and what tiny air bubbles lingered in her lungs.

Her lungs now emptied, her chest gave a sharp pull, forcing more water down her throat, past her tight grip on her neck. "GURP! GLUP!" It burned so bad, but it felt so good. She could feel her lungs filling more and more with water. Her legs began to kick out, her grip releasing on her neck as, on instinct, she began desperately scrambling for the surface. But, it wasn't getting closer! She gulped again and again. Slowly, her struggling died down. Slowly, her panicking died down. Her blue lips slowly curled into a soft smile as her lungs filled entirely with water. Oh, god, why did it feel so good every time?

"Gurg... Ghup... Nnnguhghl." Alphys gladly took deeeeep gurgling breaths, letting her tongue again roll out of her mouth as she brought her arms in, her hands gingerly running over every inch of her now incredibly tender body. By now, the burning had left her lungs, leaving her with a euphoric, dizzying tingly feeling within her, spreading from her slowed, cloudy mind, to the tips of her wiggly, entrapped toes.

Slowly, she slipped again into a euphoric bliss that would've become a drowned sleep had she not felt a tapping at her chest. Her eyes blinked open, vision blurred, but she could swear she could make out the figure of... "Uglndyblglne?" Before the dino could get any more out, her fishy lover locked lips with her, pulling her nude form close and trying to blow air into her lungs. Alphys, however, refused, closing off her throat, shaking her head and wiggling from Undyne's grasp.

Slowly, she pulled her arms up above her head, pulling her breasts out a bit and slowly releasing the air Undyne had given her in a long, bubbly stream, the sight especially arousing with how blue her whole face had become. The fish lady was easily enticed, slipping out of her swimsuit to bare her own nude body to Alphys before swimming up to her ankles, quickly inspecting the work she'd done. And, indeed, it was incredible work. Seemed the dino was just as good at tying herself up as she'd ever been.

Satisfied with her work, and with the sound of her lover's euphoric gulps, Undyne got herself to work warming up the dino. First, she reached down to the many stalks of seaweed, grabbing a particularly long strand and swimming face-to-face with her drowned lover. Her eyes drooped, blinking rapidly. Her tongue hung loosely out of her mouth, panting like a dog in heat. "Gu-Guggl. Glup, gulp. Nnnngl."

Undyne let low moans out at the display, feeling so hot and horny from watching this, her eyes wandering all over that deep, deep blue face before wrapping and tying the strand of seaweed over Alphys' eyes, giving her cheek one last lick before doing tying her hands behind her back with the same strand. She now had a bound, helpless, and blue princess that, should memory serve, she had two minutes to play with before she'd pass out.

There was no more foreplay to be done. Undyne wrapped her arms around the dino's waist, squeezing those soft cheeks of that nice, round bubble butt. She ducked her face between those two legs, sliding her tongue out and slowly dragging it along the dino's folds, causing a very audible moan to slip from her drowned lungs. The fish lady suddenly speared her tongue deep into those folds, spreading them out and forcing more moans from Alphys, her aquatic panting speeding up, growing into louder gurgles as her own tongue began taking on a purple shade, her whole body shuddering with each breath, with each masterful, sensual lick inside her pussy, causing it to wobble and contract in preparation of another powerful orgasm.

Undyne bobbed and speared, her tongue occasionally sliding out of those folds to flick at the dino's clit, her whole body jerking each time, her moans growing louder, more gurgled. Before long, she was ready to cum, and Undyne knew it. She finally pulled her tongue out of Alphys, giving her clit one last, loooooong lick. It drove her absolutely wild, her legs and head thrashing about, shouting and gurgling loud enough for the whole ocean to hear as her love juices sprayed all over her fishy lover's face, showering her and the surrounding ocean with her passion.

The dino, finally, fully spent, let her eyes drift closed. As Undyne savored in the final moments of her orgasm, Alphys let her eyes drift shut beneath the blindfold, giving a last few gurgles before her senses finally left her.

Alphys would eventually come to wake, naked, in bed, nestled up to her lover. She couldn't remember if the events that were making her so horny thinking about were real or a dream. Perhaps she'd ask in the morning. For now, she snuggled up close to Undyne, and let her eyes drift shut, her consciousness doing the same soon after.