Stucky Geek Events and @intotheomegaverse present: Mermay 2025🐚🌊
For fic, art, moodboards, or whatever else you want to create!
We're teaming up with our sister server @intotheomegaverse for 5 days of mermay-inspired Stucky prompts—featuring sea monsters, myths, romance, and wreckage. Whether you’re a fanfic writer, fanartist, moodboard maker, gif creator, or video editor, this event is for you!
✨ Unless you're participating through Into the Omegaverse, your creations don't need to include A/B/O dynamics.
👉 If you're participating through Stucky Geek Events, please keep your content focused on Stucky.
👉 If you're participating through Into the Omegaverse, you’re welcome to go multiship and multifandom, as is the norm for their events.
Each day has 3 prompts—mix, match, or mash them together however you like.
There are only five days, but you're welcome to take the entire month to swim through them at your own pace.
🪸 If you're participating with Stucky Geek Events, tag us @stuckygeekevents and use #sgemermay2025 so we can share your deep-sea masterpieces!
🐧If you're participating with Into the Omegaverse, tag us @intotheomegaverse and use #itomermay2025 so we can share your deep-sea masterpieces!
🧜♀️ No pressure. Just Stucky, sirens, and saltwater kisses.
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🐠 Rules (short & simple):
No pressure! Create what you want, when you want.
All fanworks welcome—fic, art, edits, playlists, moodboards, etc.
Late posts? Totally okay! Take the whole month if you want.
Tag @stuckygeekevents and use #sgemermay2025.
Be kind, be weird, be wet. 🐬
Share your story/art in our collection!
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🧜♂️ Day 1 – Beginnings & Bargains
He drowned for love and woke up changed.
The sea asked for a price—and Steve said yes.
"Don't open your eyes beneath the tide."
🩸 Day 2 – Hauntings & Hunger
The wreck still sings his name.
Scales slick with blood and memory.
Bucky doesn't remember being human. But he remembers Steve.
👑 Day 3 – Myths & Monarchs
He rules the deep in silence.
The crown is made of teeth.
Atlantis was built on bones—and Steve's voice shakes its foundation.
🌒 Day 4 – Devotion & Descent
Every full moon, Steve walks into the sea.
"If you love me, you'll follow me under."
A shrine of barnacles and broken hearts.
⚓ Day 5 – Rescue & Ruin
The surface doesn't want them. The sea always does.
A sailor and a monster fell in love.
Together, they sank the fleet.
Check out the Stucky Geek Events community on Discord - hang out with 64 other members and enjoy free voice and text chat.
Check out the Into the Omegaverse community on Discord - hang out with 67 other members and enjoy free voice and text chat.
Someone asked for merman Steve and I was like, FUCK YEAH.
So after the bullshit with season three, Steve wakes up one morning and hops into the shower to get ready for work, only things quickly go sideways. As soon as the water hits his skin his legs give out, causing him to fall into a pained heap at the bottom of the shower. He tries to get up but freezes as he watches his legs merge and become a fish tail.
He promptly freaks out.
He flails around for a few moments, trying to get out of the damn tub, splashing water all over the damn bathroom as he new tail wiggles about. He finally manages to flop onto the floor, dragging himself to his room and near his phone so he can call Robin or Dustin. Because honestly, he has as no idea what the hell to do right now.
As soon as he hand hovers over the phone it rings. Steve picks it up and is bewildered to find out it’s his mom, who sounds both utterly bored and stressed. Before he can ever start talking she askes him if he’s had trouble with water lately and when Steve doesn’t answer she just starts explaining.
She was a mermaid who married a human for business reasons. Acting as a envoy for the mermaids and making sure they got their share of profits form the humans. She didn’t think Steve would inherit her side of the family but if he did, it would show up now. She explains that every time he comes in contact with water now he will shift until he gets old enough to control it. With that brief explanation she tells Steve not to get caught and promptly hangs up.
At this point Steve is just sitting there dumbstruck on the floor, very much human now that he’s dried off
Of course he tells Robin and Dustin about his predicament and the two promise to help him keep his secret safe. However Steve’s luck is shit and the sheer amount of ridiculous times he suddenly gets splashed with water is bewildering, causing shenanigan's to ensure between the three as they try to keep Steve’s secret safe.
can I have all those fat merman Steve thoughts? 👉👈🥺
I love him and your writing and this AU is so good it needs to be shared!!
❤YOU SURE FUCKING CAN ❤
Warnings for VERY self indulgent content below the read more cut including: unbeta'd, extreme weight gain, belly kink, immobility, merman × light-house-keeper stucky AU, some kind of plot (spooky and also incredibly rare here), etc.
Backstory for everyone but us two lunatics 🤣:
This AU idea sparked from a conversation between Dumpling and I about belly kink awakening content from our childhood's. I opened the conversation with the book The Very Hungry Caterpillar by Eric Carle and then later re-disovered another picture book I read that Made Me Feel Things lmao
That second book was about these mermaids, little girls, who decided to not listen to their father and go talk to humans. Their Dad warned them that, hey, humans are bad and will trick you. Don't. But they didn't listen! And the two mergirls make friends with two human girls on the shore. These human girls then introduce the mergirls to human food (among other things) and they hang out everyday for a few days, swimming home in time to not get in trouble every time except-! Eventually, the human girls bring tons and tons of different food to give the mergirls rather than splitting half of their picnic lunch with them as they had before. And the mergirls eat all, all of the food. Eating and stuffing their faces until they're so heavy that they can't swim home. And they have to sleep on the shore for the night, returning in the morning to their ocean kingdom. The mergirls are then "punished" for endangering themselves with the humans as well as for their gluttony.
I never knew why I liked it so much as a child, reading and rereading, until I suddenly remembered it and connected my love of it to, well... the content on this entire blog 🤣🤣
But yes yes yes, personal backstory aside, now time for the AU backstory:
Bucky is the lighthouse keeper.
He lives alone on his little island with supplies and a few animals, mostly a bunch of birds he feeds, the flock depends on the season. Also though, he has a cat, Alpine. She hunts mice occasionally (when they become a problem) but otherwise she sticks to her fancy wet food. The little princess.
There's a boat or two dragged up from the dock at the rocky island shore to the land. He has to have some way to get back to the mainland.
And while the island is little compared to, like, fully established island nations, it is more than big enough for a lighthouse, garden, and plenty of open space.
Bucky loves his garden and grows all that he can- there's not a lot to do but cook and clean. He mostly cooks a lot before a trip back to the mainland when he drops all his treats off with friends and family.
Picture this Bucky:
(Personally I'm thinking modern-ish era but... eh, either way, 1940s or 21st century, choose your own adventure)
And STEVE
Merman Steve!
This Steve is pre-serum looking, very thin, petite, his ribs sticking out everytime he breathes in deep, underwater or on land. He's the "runt" of the pod of merpeople he's apart of and on top of that, this winter has been hard... its been Extra difficult to find food.
But, Steve,, Steve's eyes are hypnotizingly blue. As are his scales, his tail so so blue, the webs between his fingers blue tinted, scales at his elbows, the edges of his fan shaped ears, etc. His skin is so pale that it's nearly see-through. He probably, definitely has freckles... when you look close enough at least. Otherwise he's too pale for anyone to notice them. And Steve's hair is so, so blond. Underwater it looks platinum blond with the sunlight and water reflecting but above water it's wheat-golden, the longer hair at the top of his head juuust long enough to fall into his eyes.
Enough backstory! Onto the story-story!
Steve is no match for the late winter storm that centers over that patch of ocean one night. He gets bashed up against the rocks at the shore of Bucky's island. Getting bruises and thankfully only minor cuts. Mostly he's just confused as to where the fuck he is, currents pulling him this way and that. When Steve finds a smooth wooden surface to cling to instead of rocks... he stays put.
That surface is Bucky's modest dock.
And that same winter storm night Bucky feels his house tremble and shake around him. The lighthouse attached to his home is fine but... he feels as if he'll blow away in the wind! Alpine spends the night weaving nervously in and out of his legs as he walks around his home, heating up soup for dinner, taking a shower while listening to the rain batter the sides of his home and the howling of the wind beyond.
In the morning, the storm clears.
Bucky goes about the island ensuring everything is in one piece and investigating what might've been blown ashore in the night.
He finds Steve.
And...
Maybe it's the cabin fever talking; a result of being alone for so long on the island but... coming along just in time to watch this shaking, trembling creature (beautiful creature) crawl up onto his dock, battered and bruised, thin enough that Bucky might be able to snap him with his bare hands, Bucky feels the urgent need to help him.
Bucky has never seen a mermaid before.
Steve has never seen a human before.
"Are you okay?" Bucky asks.
Steve... Steve pauses and for a moment Bucky is pretty sure that he doesn't speak English but then- "I... I dont know."
"Can I help?"
Steve nods.
Bucky helps by telling Steve to stay there while he runs home to fill his bathtub with sea water since when he asks if salt or fresh water matters, Steve cocks his head and says he doesn't know what fresh water is. Isn't all water fresh? Bucky runs back and forth from the shore to his house, dumping buckets of sea water into his tub. Then-
Bucky gets a wheelbarrow, originally for his gardening needs, and easily lifts Steve up into it, rolling him home.
"What's your name?" Bucky asks, rolling him over the grassy meadow back to the lighthouse.
"Steve."
"Steve, hi, my name is Bucky."
"Bucky? Is that a common human name?"
"Not particularly, it's a... a modification of my middle name."
"Your middle name? You have a beginning and ending name too?"
"Yeah, kind of, I have a first and last name too. James Buchanan Barnes. Bucky comes from the middle name, Buchanan. Buchanan is waaaay more common then Bucky."
"I'm just Steve."
"Well, okay, I like the name Steve."
Then-
At home, with Steve now resting in his sea water filled bathtub, Bucky cleans up the worst of his cuts and bruises with antiseptic after using some soap to scrub off the mud and seaweed- "are you sure this is helping?!" Steve asks, whining,"it hurts!"
"I promise it helps."
Steve might complain about the ache of cleaning his wounds but he does the exact opposite when Bucky feeds him afterwards...
Tail splashing water as he flicks it every now and again, first Bucky has him try some leftover but reheated cooked fish with lemon and garlic butter. Steve wolfs it down so fast and so eagerly (three whole big fillets!) that seconds have to be in order afterwards! Bucky cooks too much for himself anyway and just looking at how thin Steve is, Bucky wouldn't mind cooking more just for him. He can have more than three fillets. Seconds are a few homemade scones slathered in jam. Thirds are plenty of strips of smoked ocean salmon. Fourths are more scones on account of Steve's request.
But by the time he's done eating everything Bucky gives him, barely taking enough time to mutter a thank you before tearing into whatever it is, the meal (or meals rather) are visible on Steve.
Visible in how his stomach pushes out from his ribs harshly. Unnaturally almost- so large and round that Bucky thinks about asking if merpeople have stretchy stomachs before he reels himself back in. That's a rude think to ask. In human culture but also probably merperson culture.
Either way, Bucky keeps looking, hiding in plain sight of just being a curious human. His belly... it's so stretched. Pink and taut.
Steve stretches out, sloshing some water over the side onto the floor, and moans. "God, if I could eat like this all the time, I would! And I'd never swim again..." he chuckles, "I'd sink like this I think," he slaps a hand over his stomach, forcing a burp out of himself.
Bucky laughs to cover his own moan but can't help continuing to stare at how Steve's webbed hands rub his swollen stomach. And without another actual thought, beyond ohohohohoh Bucky adds, "i-if you can't swim tonight, that's okay. You can stay here. If. Uh. If you want to. I'm not- not trapping you here. You are free to leave but if you want to-"
"Oh, yes, thank you-" Steve murmurs, still rubbing his own impressively large stomach, eyelids drooping as he turns his head to look at Bucky.
Bucky stares back and puts his foot in his mouth again, asking, "do you want help?"
Fuck. Oops.
"With what?"
"That-" he chokes out after a moment of stuttering, eyes flicking to his tortured, bloated stomach.
"Uh, I guess, how'd you be helpi-?"
"Like this," Bucky interjects to lay his hands on his skin, fever hot and thin, stretched over the rock-hard mass of food inside him.
Steve moans. He struggles to lift his hips up into the touch too.
Bucky has never felt more- more electric. Since the moment he first spoke to Steve he knew he was special and he liked him but touching him... fuck. Bucky is pretty sure he's in love with him. He's beautiful and smart and-
Full.
(Bucky later jokes to Steve that if he had known better and been more guarded he might've thrown Steve out with accusations of him being a siren, not a normal merman. Or maybe he wouldn't've... he might've been too hypnotized.)
But... it goes on like that, Steve lives in Bucky's bathtub, eating as much as Bucky will feed him. Probably even more than Bucky would've give him, if not for his asking for more. But sometimes Steve gets into a fit of feeling like he's too reliant on Bucky for everything or whatever and will ask to be put back into the wheelbarrow and taken back to the ocean. They say goodbye but he never really leaves. He stretches his fins in the ocean for a while. Staying low enough that Bucky can't see him from the shore or lighthouse but never returning to the ocean depths. Eventually, sheepishly, Steve turns up back on Bucky's dock.
They don't make comments on how or why he's back. Bucky is simply happy to have him back.
Steve gains weight.
It usually doesn't hit Bucky, how Steve is changing, until he takes him from the shore back to his home with him after his adventure alone. He stops looking for the signs of his changing body when he's always in the tub, day after day...
He really does change though. First, he gains enough weight that Bucky can no longer spot and count each of his ribs but instead looks healthy. Then he looks a little husky... some of the weight goes to his muscles, sure, but calories seem to favor becoming fat when in his body. Then he's chubby. His stomach rounds out first, a little pot belly that grows larger until its a gut, but subtlety, all the while, his hips and tail catch up to his gut by filling out wider and wider with blubber. His pecs fill out too. Little chubby tits that match his swollen tummy and his thick tail. He gains weight until he looks so soft that Bucky kind of wants to either grab him and sink his fingers into his blubber or he wants to bite him. To feel how soft he is.
He gains and gains, stuffing himself with human food and hardly swimming. Just sitting and plumping up in Bucky's tub. Waited on hand and foot (tail?), stuffed with more food than he could ever hope to catch.
And Steve. Well, Steve just eats and responds to Bucky's prompts or questions or general conversation between bites. Bucky leans against the bathroom wall or the side of the tub and talks between his trips to the kitchen. He never gets tired of feeding Steve or talking to him.
Somewhere along the way, they also become Bucky and Steve. Getting together. Bucky doesn't really know when or how that happens. He's very glad it does though...
Once, when Steve genuinely wants to stretch his fins and isn't pretending to go back into the wild, Bucky struggles to lift him up. He's truly fat now. He forgets how fat he's gotten. It seems like that stick-thin, angular merman is so far away. Besides, Steve looks much more like himself fat. Its hard to describe but fat Steve looks more like Steve than a half-starved, haunted merman.
Steve gets into the wheelbarrow with Bucky's assistance, he swims for a hour or so (only an hour?? he felt like it was so much longer... has swimming always been that exhausting?!), then returns to the tub and, oh-
He doesn't fit very well in the bathtub anymore.
Fat belly. Fat tail. Fat tits. Fat arms. Fat. Fat. Fat. Steve is fat. Too fat for Bucky's bathtub, evident by the tight feeling of his big body pressed against the cold porcelain. Too fat to swim away from sharks or predators but also too fat too catch fish in the ocean. He's no longer slim, no longer slipping quickly through the water. He lumbers now, especially on land. Clumsy and fat.
😳😳
Both Steve and Bucky pause, staring at each other. Steve wedged in the tub. Bucky bent over him, looking down at the mountain of blubber he makes. His tummy especially.
Fuck.
It's been an entire year since they've known each other now, winter melting into spring, hinting at summer all over again, and Bucky promises that come spring and summer, he'll begin digging out an in-ground pool for Steve to live in. Something he can't outgrow.
"I'll have my own zoo then, huh? A live-in zoo with my pet whale. All to myself to spoil and play with, yeah?"
Steve squirms where he's wedged. His blush works down from his forehead to his soft chest. His nipples are hard. His belly has had time to digest from his swim and he aches to have Bucky stuff him full again. He wants to be rock-hard under his layer of blubber. Bloated and stuffed so full that Bucky can press down with his fingers and feel it.
He wants to be fed so big that Bucky won't be able to pick him up. Outgrown the tub and wheelbarrow...
By the time the pool is dug and water is rushing into it, ground water and salt water and rain, near the end of summer Steve really can't fit himself in the tub. His fat sides squish out over the edge. His tail is about as wide as the tub and sticking his ass down into the tub, then moving, creates suction. So much so that he almost can't shift in the tub without help. His gut and incredibly intensely stretch mark-ed sides are always dry, sticking out of the top lip of the tub. He is huge. A whale. Not a little mermaid, slim and svelte as he was when he first showed up. Now he's covered in bubbler and stretch marks and fat and rolls and he has trouble swimming. He has trouble moving, with or without Bucky's help. When swimming, Steve can't really dive, his blubber makes him too buoyant. But he can float on his back, like an otter. Belly to the sky.
His belly is his biggest part of him. To the point that he looks SWOLLEN. Pumped full. Strained around the constant snacks and meals and desserts.
Everyday when Bucky finishes cooking breakfast, he greets his boyfriend by humming, "good morning, whale," and every time it makes Steve shudder inside, hot for it.
He might already be a whale but he's seen bigger whales. He wants to be bigger.
The move from tub to pool is extremely slow and strenuous. They have to stop twice to get Steve snacks before they're done. Bucky jokes that it's unfair that he's so hungry because it means that he's heavier for the rest of the journey to the pool 😤
Not that Bucky doesn't want him bigger or heavier, of course.
Steve loves his pool (other than the part where he has to swim more often but don't worry, he just starts eating more and he gets some muscles under all of that fat)!! He gets to feel the sunshine and breeze and he keeps getting all the same amount of food too. It's lovely. He's even happier. A little ball of lard. Endlessly round with roll after roll, stacked up around his dome of a gut. He's more fat than anything else, spending his days in the shallow end of the pool with Bucky feeding him until he literally can't eat another bite, moaning and surrendering.
Bucky climbs on top of him like that, Steve so fat that he's held down to the bottom of the pool, even in a few inches of water, heavy, and straddles his tail. Rutting his dick against his blubber-thick tail and burying his face in Steve's obscenely round belly (his arms have to be spread wide to reach the ground around his round gut). Stuffed, PACKED full of his love in food form.
Bucky gasps and moans and works himself into a frenzy on top of him. And all the while Steve simply enjoys, drunk on food and arousal, wet with burning hot desire but... again, he's food-drunk, body slugging through all the fat and grease and flavor, so he can wait while Bucky gets himself off.
Bucky could fuck Steve, his slit gets wet and would hold the shape of him sort of like a vagina but usually he can't wait. Bucky needs it now.
Bucky mouths at his soft fat over his hard, packed tight belly, and humps him. Splashing water all over. About to come and muttering, crazed, about how big his whale is. His prized whale... whining about how blubbery and huge his trophy whale is. Bigger than everyone else and yet he's still going to get bigger. A growing, greedy whale. Bucky keeps going, winding himself and Steve up by promising that he's going to go to the town on the mainland next time and buy everything he can, every type of food, and stuff all of it into him so he can make more blubber. Get bigger. His whale. He loves his big, fat, huge whale. Fat enough and full enough that he can't even swim. He can't move. All he can do is get bigger, fatter, larger. His whale.
Bucky comes, splattering messily over Steve's gut. The part of his whale he's made the largest. Steve moans because as crazed as Bucky is for this, Steve is more. He's the one who's put on so much weight that he's unrecognizable. He is the one still opening his mouth.
Requsted by: @ mrsdeanwinchester19 Steve x reader mermaid soulmate au
You swim as quietly as you can through the deserted halls of the castle, your tears mixing with the salt water. If only a sailor could find you now, they’d kill for but one of your tears. You’d be just as much a prisoner to a sailor as you were in your home.
Beyond the walls of the castle, you feel a weight lifting off of you. Out here you were free. Not tied down by ancient rules and prophecies. Not betrothed to a prince you had never met.
You square your shoulders, determined to leave it all behind. You swim until the early morning sun lights up the water around you. Finally, you make it to a group of caves that traveling merpeople frequent. You speed up, your eyes trained on the caves ahead of you.
“Woah! Watch where you’re going,” A breathless voice yells as you slam what feels like a wall of coral.
You lift your eyes and are met with a stunningly beautiful merman. His cheeks flush as he looks you up and down.
“I- uh- I’m so sorry, Miss,” he stutters.
You laugh softly and his returning smile takes your breath away. “That was on me, no need to apologize-”
“St-Grant! My name is Grant.”
You laugh again and say your name back to him. He repeats it with a reverence that warms you to your core.
“It’s nice to meet you, Grant.”
“Likewise, milady.”
You raise your eyebrow at the formality and pray that he hasn’t recognized you. His cheeks flush again and he ducks his head. “Sorry, force of habit.”
“Habit?”
“I lived in a palace until very recently.”
You look at him closely, trying to place his face. You know it’s not one you would soon forget. “Which pack were you apart of?”
“King Joseph and Queen Sarah.”
You breathe a sigh of relief. “It’s nice to meet another palace escapee, then.”
He gives you a bright smile. “You too?”
“As of yesterday, yes.”
“If you ever want to talk about the woes of palace life, you know where to find me.”
