Underwater Choo-Choo

by Anonymous

Summary:

Sebastian clears his throat, abashed. "...I'd like to propose to you a- a deal, of sorts. A mutual transaction, where we both get what we want. You know, like usual."

 

"Like usual. Okay." Sometimes you wish he'd stop using so many words and get straight to the point.

 

"I am currently going through a period of heightened arousal- an unfortunate side effect due to the numerous genetic strains I was mixed with. You've read my file; the whale, the fish, the shrimp- take your pick. In other words, a mating season. A heat."

 

You nod, seeing where this is going. You were quite the adventurous person before you were convicted for seven counts of first-degree murder, but safe to say you've never fucked a fishwhalesnake person before. Your dick twitches a little in interest. Down, boy.

Chapter 1

You scratch your head as you crouch in front of the vent. Did you get it wrong? You're pretty sure this is it.

 

"Sebastian?" You say into the vent. You can see the light behind it, hear the unintelligible crackling of the radio he always has in his makeshift shops. "Sebastiaaan?"

 

There's no answer. You shrug and elbow the vent open, the cover landing on the floor with a clang. 

 

You crawl into the vent, cursing as you bump your head. 

 

You pop your head out. "Sebastian-? Oh." 

 

The shopkeeper is leaning against the wall, tail stretched across the room. His lure light is off. The fluke of his tail flicks back and forth, and there's a flush on his irritated face as he gripes, "Did no one ever teach you how to knock?"

 

"Only if there's a door," you reply, shuffling out the vent. You unzip your diving bag, pulling out the stack of documents you have stashed inside. "I want a Blacklight. Have you got a Blacklight today?"

 

"No. Now get out before I lose my patience."

 

You blow a raspberry. "What is up with you today? You sick or something? Please don't die, baby, I don't know what I'd do without you!"

 

The flush on his face seems to darken. You might be imagining it, though. You did just encounter Chainsmoker a couple rooms ago. You know the smoke is some kind of fear inducer but you will always treat it like it's Mary Jane.

 

"Shut up," he says. "I don't have the time to indulge your... inane yapping. Leave, before I make you."

 

"Okay, damn," you say, gathering the documents and standing up. You collected a lot of files this run, and you don't want to risk angering Sebastian to the point that he just opts to kill you and take the data. 

 

As you readjust your diving gear, you spot a familiar purple glint on the upper-left side of his tail, near his waist- previously unseen to you while you were crouching. 

 

"You lying asshole!" You cry out, pointing at the Blacklight. "Wicked deceiver! Teller of untruths! Fucking mendacious bitch!"

 

Sebastian looks like he's about to bite you. "Get out."

 

You are going to die on this hill. "A reputable vendor cannot withhold perfectly serviceable merchandise from a paying customer with no due cause!"

 

"GET OUT!!!" He roars, charging forward.

 

"Fuck you, man!" You yell as you dodge the first swipe of his claws. You leap towards him, wrapping your arms around his tail, and grope for the Blacklight.

 

The second he feels you squeeze him, Sebastian goes limp and falls down on his hands; his lure light flickers on as he shivers violently.

 

You quickly back away. "Okay yeah no, what was that?" Is he going to explode or something? 

 

Sebastian just continues to shake. 

 

"I'm... just gonna go," you say quietly, making for the vent. Maybe he had a sesh with Chainsmoker and mowed a little too much grass.

 

"Stop," he says. "...let me see your penis."

 

"Huh?"

 

"Pull down your pants."

 

"Huh?"

 

"Let me see your penis."

 

"Huh?"

 

Sebastian snarls, head jerking up to glare at you. "Are you deaf or something? I said pull down your pants and show me your dick."

 

Bewildered, you pull the hem of your trousers down, tugging your boxers along with it.

 

Sebastian stares. You know how big you are- very well above average. It's gotten you your fair share of admiring whistles during your times in the communal showers. You're more than a little smug about it.

 

Sebastian is still staring. He looks a little dazzled. His tongue flicks out, tasting the air. Is he trying to smell your dick? You haven't bathed in days. You cough.

 

His head snaps back up at you with the look of a dog that'd just been caught going through the food pantry- guilty, and a little excited. 

 

Sebastian clears his throat, abashed. He turns away as you button your pants back up, but you catch him stealing another glance before you cover yourself completely. "...I'd like to propose to you a- a deal, of sorts. A mutual transaction, where we both get what we want. You know, like usual."

 

"Like usual. Okay." Sometimes you wish he'd stop using so many words and get straight to the point.

 

"I am currently going through a period of heightened arousal- an unfortunate side effect due to the numerous genetic strains I was mixed with. You've read my file; the whale, the fish, the shrimp- take your pick. In other words, a mating season. A heat."

 

You nod, seeing where this is going. You were quite the adventurous person before you were convicted for seven counts of first-degree murder, but safe to say you've never fucked a fishwhalesnake person before. Your dick twitches a little in interest. Down, boy.

 

"It usually lasts three to five days, but if I receive... assistance, the heat should be shortened, to about a day," he says. "If you help me through this, I'll give you that Blacklight you want, as well as a set of batteries, free of charge."

 

You hum, scratching your head. "Throw in three code breachers and I'm game."

 

If Sebastian had eyebrows, he would have raised one. "I don't believe you're in a position to negotiate. I'm already being very generous. I could simply ask the next Expendable that passes by."

 

You shrug. "Sure, but my dick is huge."

 

"I'm sure there must be some other prisoner of a similar size," Sebastian says. "But very well. I can agree to one code breacher."

 

"Yeah, no. If there's another dude slinging a schlong as mean as me, good luck finding them within the day. Three breachers."

 

Sebastian makes a low, threatening grumble. "Don't push it. One."

 

"I grow two and a half inches more when hard. Three."

 

"...Deal."

 

You smile, removing your diving gear. You figure the SCRAMBLER on Sebastian's back would stop it from popping your head. "How do you wanna do this?" You ask as you set the diving backpack and oxygen tanks against the wall. "I know a lot of good positions. But what I don't know is what equipment you've got, how long it takes for you to cum, and how long it takes for you to recover after cumming, cause if you've got no refractory period, let me tell you, we're gonna have to get creative cause I can't keep pumping immediately after I've bust a n-"

 

Sebastian snaps at you as he undoes the belt buckles along his tail. "I've got a slit, two retractable cocks and a shithole, like everybody else does. Just shut up, lay down, and get hard."

 

You raise your eyebrows at 'retractable cocks' (two, wowie!) but raise your hands in mock surrender and mime zipping your mouth shut. You take off the upper half of your uniform and fold it into a neat square, doing the same with your pants, leaving you in only your boxers.You kneel down and pile them on top of each other, laying the stack of clothes on the floor. 

 

Sebastian scoffs as you place your head atop the makeshift pillow, but ultimately ignores you as he unstraps the rest of the belts. You pull your cock out of your boxers, stroking it lightly as you imagine what that snakewhalefish pussy is going to feel like. Cold? Maybe. Tight? Hopefully. Slimy? Oh, you pray it is. 

 

It doesn't take long for you to get erect, and by the time Sebastian is finished removing all his little odds-and-ends, your junior is standing proudly at full mast: like a ship's flag, ready to explore the sea. You can taste the salt. 

 

As he slithers over to you, you say, "Ahoy, captain. Ready to set sail and explore the vast waves, I am!"

 

Sebastian is unimpressed. You look him up and down, unused to seeing him without all the bags and belts attached. He's taken his coat off and placed the SCRAMBLER nearby; leaving him in only his scarf, and a cream-colored undershirt with the weird ruffles along the collar. You briefly wonder where and how he got his clothes- but you snap out of it as he places his hands on your knees, spreading your legs. He slouches down, face coming closer to your cock. That forked tongue flicks out again, and this time he actually tastes it, deftly catching a drop of precum that had been beading at the tip. 

 

The moment he closes his mouth, Sebastian shudders. You can't tell if that's a good or bad thing. He shuffles forward till you're face-to-face, holding himself up on his arms. You peek down and see the slit he'd mentioned, two little nubs sticking out the upper edge, crotch hovering directly above your cock. His tail is curled up behind him, the fluke wiggling in anticipation. 

 

He shifts downward, supporting himself on his elbows instead of his palms. As he does this, his slit makes contact with the head of your cock, and you tense up. It's a little cold- and weirdly smooth, but most importantly, it's sopping wet. It's like a slip-n-slide. That mating season thing is no joke, huh?

 

You glance at Sebastian, but he isn't looking at you, instead focused on the point where the two of you are touching. His third hand hovers a few inches away from your cock. He seems unsure. A little hesitant.

 

You want to tell him you've never been more ready to have sex in your life, but if you open your mouth you'd probably just end up with a mouthful of his hair; instead, you just grab the base of your dick and drag the head along the line of his slit, searching for the entrance. 

 

Sebastian jolts, the light at the end of his lure flickering in surprise. "H- hold on," he mumbles, third arm grabbing lightly at your wrist. "Just, just give me a-"

 

Your other hand sneaks up behind him and places itself in the center of his back, fingers splaying. In one quick movement, you lift your hips and your cock eases inside, sliding in a quarter through. 

 

You bite your lip. Fuck, he's tight. And warmer than you thought. 

 

Sebastian shrieks, ears fanning wide and tail flicking to the side, sending items flying across the room. You hope the Blacklight isn't damaged. 

 

His third arm grabs the wrist of your hand still curled around your cock. His grip (on your wrist, but you guess it could apply to your dick too) is so tight you can hear your bones creak. "I told you to wait," he hisses, tone promising danger. But you can feel his hole squeezing you like a vice, so you don't take it too seriously. 

 

Your hips rock against him gently. Sebastian groans, head dropping down beside yours onto the floor. His grip on your wrist loosens.

 

"I'm just trying to help," you say soothingly. "Don't you want to get this over with as quickly as possible?" Your hands settle themselves on Sebastian's waist. Slowly, you pull him down, maintaining a slow, subdued rhythm as you grind into him. 

 

He twitches with every inch that goes into his cunt, letting out little clicks as you mumble quiet reassurances into his ear. He relaxes, and his elbows slide out from under him. Without his arms carrying most of his weight, you're unable to prop him up, and his hips drop, pressing yours down along with him. You wince as your tailbone hits the floor.

 

His crotch slams against yours with a dull slap of skin, and you bottom out completely. Sebastian lets out a long, filthy moan. You feel something sliding against your belly, spurting out a hot gush of liquid. That must be the double cock.

 

"Did you come?" You ask. Your tone is a little teasing.

 

"Shut up and fuck me," he mumbles. 

 

It's kind of hard to move your hips when you've got 300-something pounds of snakewhalefish (man, you have got to come up with a shorter name) hybrid slumped on top of you, but somehow you manage. You begin to roll your hips again, setting a steady, moderate pace that sends Sebastian squirming. Your current position leaves a lot to be desired, what with the miniscule space you have- you're just grinding against him, basically- but winners don't quit, and like the pirate you are, you're going for the gold. Arrr.

 

Sebastian realizes your predicament and shakily hefts himself back up on his elbows. 

 

Now we're talking, baby. You hike your knees higher and brace your feet against the floor; beginning to piston in and out, hard. Sebastian lets out a set of chirps, clicks, and moans, interspersed with the occasional expletive as you fuck him. As you pump your hips you wonder if he's swearing in fish language too. What would that even sound like? What's whalespeak for "Fuck, yes, harder!"

 

Whatever it is, Sebastian is definitely saying it, because his third hand slips itself under your lower back and begins urging you upward with each thrust, adding a lot more oomph to your bang. You start to feel a little like a toy, but whatever. Sebastian is tight, wet, and warm around you- definitely within the top ten of your sexual escapades. Maybe even top five. He somehow manages to be tight enough to turn coal into diamond, and completely soaked. Top five for sure.

 

His lure light flickers with every thrust, and you're getting the vibe that you're in a nightclub, except Sebastian's the DJ and you're the record player. Or are you the DJ? And instead of EDM it's just Sebastian making his snakewhalefish (and maybe shrimp?) noises while occasionally going, "Oh fuck, oh yes, yes, fuck, fuuuck... I'm gonna- I- ah- aanngghhh!"

 

Oh, he came again? Damn, what is this, Ejaculation Any Percent?

 

Sebastian collapses on top of you with a low whimper, his entire body a twitchy mess. Is he done? What? You haven't even come yet. You bought your ticket and boarded the Kraken®, but you haven't even gotten past the first loop. What kind of SeaWorld experience is this? One star!

 

You vocalize your customer complaint. "Hey, are you done already?"

 

Sebastian lets out an unintelligible mumble. You take that as a "fuck off."

 

As you slowly extricate yourself out from under him. Sebastian growls, grabbing your wrist. "Where the fuck do you think you're going?"

 

"Man, I thought we were done."

 

"Did you not hear me say to wait a moment?"

 

"Human ears, human frequencies, bro. If you said something it was on a level I could not fathom," you say, standing up. "But alright, let's do this. Round two aboard the underwater train. Do you wanna try being the one on the bottom this time? My thighs are starting to burn."

 

Sebastian grumbles but flips over, the movement of his tail flinging another set of items against the wall with a loud crash. You wince, mentally crossing your fingers. Please don't be the Blacklight, please don't be the Blacklight.

 

Sebastian looks up at you with lidded eyes as you take your boxers off entirely. You'd gone a little soft, but seeing him stare at you like that brings you back up to full hardness again. You straddle him, sitting down a couple inches below his slit. 

 

Grabbing your cock, you position the head against the entrance and sink in. Sebastian bites his lip. His scarf had unraveled somewhere along the ride, and you see the gills on his neck flutter as you slide the rest of your cock in. 

 

Once you've fully sheathed yourself inside, you take a moment to imagine yourself as a captain on the edge of his ship, surveying the open seas. 

 

"Yeehaw, matey," you say, and place your hands on his lower abdomen for balance. Sebastian's face twists with confusion, but as you begin to piston your hips at a faster pace than last time, it quickly shifts into one of extreme arousal, his mouth dropping open. 

 

Sebastian's hands immediately grab your hips, claws digging into your skin as he makes you bear down with each thrust. 

 

"Y- yes, yess," he hisses, "So good, hhn, ffhh, fuhh- fuckk," he sobbed.

 

Alright, you can't lose to him in the speaking section. You resist the urge to dirty-talk him in a pirate accent. "Yeah, you like that?" You say, slowing down and fucking him with longer, dragging thrusts. "You're moaning like a whore. You like it that much, huh?"

 

Sebastian just whimpers, letting out a pitiful trill. You smile, feeling a bit mean. Your cock pulls out with pop, and you laugh at the mournful sound Sebastian makes. The hands on your hips pull you down, trying to get you to fuck him again. 

 

You grab your cock and slap it against the upper portion of his slit, right on the spot where his hemipenes emerge. Sebastian jolts with a gasp, cocks twitching, spurting a small load of liquid on his belly. "Answer me," you say. 

 

Sebastian shakes his head. "Just, just put it back in," he says. 

 

"That's not an answer," you chide, rubbing your tip teasingly against his hole. 

 

"I'm not gonna answer your stupid fucking question, so just- hnnah?!"

 

Your hand stings from how hard you just smacked his slit, but it was worth it. "That's not an answer."

 

"You- you, you perverted little fu-" You slap him on the slit again. "Fffuckk!" He squeals.

 

"Answeeer," you sing-song, two fingers massaging the skin around his slit. They form a V-sign and push the folds together, a glob of slick trailing out his hole as you apply pressure.

 

"Yes! Yes, I like it, I like it," he stammers, desperate and embarrassed. "Are you happy? Just put it in already!"

 

"Very happy," you say, sliding your cock back in. "Here's your reward."

 

"Ahh? Oh- ooohh," he moans as your hand curls around his hemipenes, the two lengths rubbing against each other as they're encased in your grip. 

 

You grunt as he tightens up even more, and lean forward on your other hand to brace yourself as you fuck him with harder thrusts. His cocks are leaking a steady stream of fluid as you stroke them up and down, as wet and slippery as the rest of him. 

 

"Don't, don't stop," he pleads, his walls squeezing spasmodically. "I- I'm close, I'm so close, I-"

 

His lure light flickers as he throws his head back, spine arching up so quick that you almost fly off. His penises squirt out a gush of cum, while his hole pulses around you. He slumps down, hands sliding off your hips.

 

You don't give him time to bask in the afterglow- you continue to fuck him, in harsher strokes than before. Sebastian shudders with a startled moan, claws digging into the floor.

 

"Wait!" He says, trying to sit up. "Nnhh, wh, waiih- wait, I just came, so, ah, soo-!" he squirms, tail thrashing back and forth as his instincts war between swatting you away like a fly or laying there and taking it, begging for more. 

 

"I haven't even cum once," you huff, "Don't be so selfish, man. I gotta get my money's worth."

 

"I'm the one paying youuuu," he wails, shaking his head back and forth. He starts to shake erratically, as if trying to buck you off, but you remain steady and fuck him even harder, hand still pumping his cocks. You're getting close. "Aaa- aa- wait- something is-!" he sucks in a deep breath, lure light growing brighter and brighter. "Something- I- I- waitwaitwaitwait-"

 

You're so close. You let go of his cocks and brace both hands against the floor, ramming into him like you're Pandemonium and he's the meaty little EXR-P you just spotted scrambling into a locker. 

 

Sebastian seizes up and screams, a deafening, guttural screech that echoes across the room and sends all the lights flickering for a good five seconds. He slams his hands down on the ground, clawing the concrete floor apart, and orgasms. His cocks spray a bout of fluid that's a thinner consistency than the last, almost like water. He clamps down on your cock, walls pulsing erratically like he's milking you for all you're worth.

 

That's what sends you over the edge, thrusting forward one last time before you fill his hole with a rush of seed. You're no chef, but you're sure even Gordon Ramsay would vigorously applaud the creamy fish pie you've just pulled out of the oven. 

 

You slouch down, resting your head against Sebastian's heaving chest. You take a moment to catch your breath, sweat dripping down your temple. 

 

You startle as you feel hands wrap around your waist. You sit back up, shivering as the movement causes your dick to twang with oversensitivity. 

 

Sebastian looks up at you, his hair a mess, eyes glowing a bright, bright blue. There's drool trailing down the side of his mouth. 

 

"Again...♡" he says breathily. 

 

You chuckle nervously. "Let's, um- SeaWorld is closed momentarily, so let's head over to the seafood buffet for now, okay?"

 

-

 

The door slides open with its usual mechanical whirr, metal slamming against metal.

 

EXR-P A207 beckons her teammates forward, turning her flashlight on. 

 

"This room is pretty big, but same as usual," she orders. "Check every nook and cranny for any documents and vials. I heard a dweller a couple rooms ago, so D489, guard the door and keep an eye out."

 

D489 nods. Just as the other prisoner begins to move, a low, raspy noise echoes from one of the vents. A light seems to emanate from behind it. 

 

While the other prisoners freeze, A207 relaxes. "It's alright, it's just the shopkeeper-"

 

Another noise echoes, a higher-pitched groan that sounds like several aquatic creatures meshed together.

 

"Nevermind, everybody out. Move, move, move," A207 says, sprinting to the next door. 

 

"I thought you said it was-?"

 

"I was mistaken! Whatever that is, I don't want to be there when it comes out! Come on!"

 

"We need a keycard-"

 

"I have a code breacher! Let's fucking go!"

 

The door slides open. The prisoners dash out of the room like fire's at their heels. 

 

As the last one leaves, he hears an oddly familiar voice trill, "Harder... harder..."

 

The prisoner bolts.

 

 

Chapter 2: + art

Notes:

Got some things wrong, so I might want to delete it later.

:D

Notes:

I regret nothing.

Series this work belongs to:

• Part 1 of pressure ss fics