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Bakugou drifted quietly through the reef shallows, his eyes darting this way and that, searching as ever for his next meal. His appetite was insatiable, with the spring so near he hungered every second, his body seeking vital sustenance to ensure that he would be a strong desirable mate for any of his kind who passed his way.
He snapped up smaller fish in his jaws, his spines catching those who came too close and paralysing them, creating easy prey wherever he went. It was almost too easy, to be the largest and strongest creature in the area. He wanted more. Longed to feel the thrill of the hunt again before he finally claimed a mate and built them a strong home nest to settle in.
Further and further he swam, tail lashing behind him, growling at those creatures that weren’t worth eating, standing off briefly against a wide mouthed shark who drew too close but decided to back away rather than fight him. He was almost ready to turn back and return to his favourite cave when a scent caught his nose that he had never smelled before.
His mouth watered, pupils widening as the sweet heady fragrance filled his lungs and overtook his mind. He didn’t know what it was, but he knew that even from that first scent that he desired whatever had created it.
He followed his nose though the shallows, drifting towards the scent with all else forgotten until finally he saw its source.
Swimming in gentle circles was a creature not too unlike himself. Small and delicate with fine fins and pale skin, scales in red and white striping across his tail and wide mismatched eyes. He was perhaps the smallest member of the finned folks that Bakugou had ever seen, assuming that he was fully grown as the lean muscled torso suggested. And whilst Bakugou was all spines and spikes, this creature looked soft. Fragile. Delicious.
Bakugou knew immediately that he had to have him, and the hunt was on.
He dropped into the high weeds, his hands all but trailing the ground as he wove through every shadow that he could find, approaching his so far unaware prey. There was a growl rising low in his throat, blood rushing in his ears the closer he drew.
It was only when he was so close that he could have leapt forwards and ended the matter with a single strong bite that his prey startled, looking up with those pretty eyes so wide, a breath hitching his chest before he turned and darted away from the patch of sun that he had been languishing in.
Bakugou only chuckled, after all, there was no fun without a little chase. He followed after the swiftly retreating tail, the long silklike fins always whipping just out of sight, the delightful scent of his quarry drawing him onward. Faster, harder, his spines straining as he pushed on and on, weaving around rocks and crashing through shoals of fish that would usually make for an easy snack.
There was nothing but the mer ahead of him. No creature could possibly satisfy him now that scent was in his nose, the sweetness marred with a tang of adrenaline and fear that drove Bakugou wild. Lust and bloodlust mingled into one powerful sensation in the core of his chest as he gave chase.
They swam for hours, and at times Bakugou was certain that he could see the mer ahead of him starting to slow, his gills straining from the exertion of fleeing so fast for so long, until finally he dove, deep into a crevasse in the water that Bakugou had not previously seen, perhaps intending to go so deep that his predator would not be able to follow. But Bakugou was born in the deep places of the ocean and that rumbling laugh rose in his chest as he dove, down and down into the dark, until they were in the bottom of a ravine with no place left for the little fish to run.
Bakugou surged forwards, his hands striking the rock either side of the retreating merman’s back, his claws digging into it and spines fanning forward to lock the man in place. He wasn’t trembling, wasn’t sobbing or begging or any of the other things that Bakugou’s lesser prey had often resorted to. He just remained pressed to the rock, mismatched eyes holding Bakugou’s firm, a hard expression contorting his beautiful face, his head canted to one side to show the soft frills of his upper gills.
It would be natural to strike, to unhinge his lower jaw and take what the merman was presenting to him, but as their eyes met a new feeling surged up in Bakugou’s chest. To bite, but not to kill. To claim.
To keep.
To mate.
“You’re mine,” he growled, the sound low and terrible.
“I am nobody’s,” the mer replied, as though stating a simple fact. “Kill me or don’t, but do it quickly.”
There wasn’t a single trace of fear in his voice and Bakugou shuddered. He was so much larger – a predator by every definition – but this delicate little merman wasn’t afraid of him. The look in his eyes was one of strength, resolution.
And instead of taking the bite that he had so desperately wanted only moments before, Bakugou leaned in close, so close that their tails were brushing together, showing his teeth and letting the venom drip from them.
“Are you afraid of me, Peppermint?”
“No.”
“You should be.”
He closed the distance between them, licking a stripe over the gently fluttering gills with a groan. The taste was everything that he had imagined, and he closed the man even tighter against the wall.
“What do you want from me?” The merman asked, the smallest tremble in his voice that only made Bakugou desire him more.
“Everything,” he muttered, bringing a hand down to hover above the merman’s waist, not quite touching him. Not yet. “What do you think, Peppermint. You could be such a pretty fucking mate for me.”
He was so close, aching to just take the thing that he wanted, as he had always done. He could easily have the man whether he wanted him or not, but his taste was intoxicating whilst afraid, he could only imagine how much better it would be if he was truly receptive. Slick and sweet and begging .
“I don’t need the protection of a mate,” the peppermint merman huffed, but his hands came up to Bakugou’s chest, not shoving away, just sitting there, as though testing him. Feeling across the thick muscle, teasing around the edges of the scales and drawing up another growl.
Bakugou caged him in closer, letting his lips fall to skin again, taking another small taste of his prey. He would have him either way, as mate or meal, the choice he would leave to the other. And whilst he made that choice it couldn’t hurt to have another taste.
He kissed and licked up towards the mermans finned ear, teasing it with his teeth and enjoying the gasp that it drew from his peppermint prey, the way that his pupils dilated a little at the feeling, hands gripping his chest just a little tighter.
“So what’s it to be,” he whispered, lips against skin. “Will you be mine, or are you just another delicious morsel for me to consume?”
“That-ah, isn’t exactly a fair choice.”
“Perhaps not, but it’s the only one you have.”
The merman turned his head, one hand coming up to rest against Bakugou’s cheek. Seconds stretched long between them as he looked for something in Bakugou’s wild eyes, and then he gave the smallest nod, bringing their lips together.
Bakugou leaned into the kiss, nipping at the plush bottom lip, swiping his tongue across it demanding entry. When the lips parted he groaned, feeling a slim tongue flick over his, the kiss deepening every second. The merman’s hands were in his hair, his finally met the tiny tight waist, pulling them closer, so that their bodies were pressed flush together there in the dark crevasse.
“Shouto,” the peppermint mer panted when the kiss parted. “If you’re going to mate me, might as well know my name.”
“Katsuki,” Bakugou rumbled in return, before slamming their lips together again, using all of his strength to lift and press Shouto into the wall behind them hard and rough, his hands gliding over every patch of skin and scale that he could reach, learning the form of the man that he was desperate and determined to claim.
When his fingers dipped lower, finding the softening slit where skin met scale he grinned, licking into their fervent kiss, pressing that finger deeper and groaning when he found not a growing cock but a deep receptive slit, already wet with slick, the bud of a clit slowly rising.
“Perfect,” he groaned, pressing kisses down Shouto’s neck and shoulder, delving that finger deeper and feeling walls suck and tug against him. “Who would have thought that so pretty a creature would have such a needy cunt, and all for me.”
“Ah, fuck -”
“And a dirty mouth to go with it,” Bakugou grinned. “Perfect, pretty prey.”
He slammed their mouths together again, crooking his finger inside Shouto and running his thumb over his tentacle the moment it wound free, drawing delicious whimpers and moans from his partner that only drove him more wild.
A second finger slipped in quickly after the first, stretching and delving, spreading the slick that Shouto was creating in excess, pumping in and out until the smaller mer was wailing, head thrown back against the rock, tiny claws digging into Bakugou’s shoulders until they drew blood.
“That’s right,” Bakugou whispered. “Sing for me, beautiful. Let the whole ocean hear what a pretty whore you are for me.”
“Katsuki- I, I!”
“Don’t hold back on me now, cum on my fingers, Peppermint.”
Shouto shook in his grip, cries and whimpers getting louder, thick tears welling up in the corners of his eyes, clinging as bubbles to long wet lashes, walls sucking and squeezing Bakugou’s fingers so tightly that he couldn’t pull them back when he finally fell apart.
It was the most beautiful thing Bakugou had ever seen, and he leaned in to gently kiss Shouto, rumbling his approval.
“Are you ready for me now, my perfect mate?”
“Yes, please yes.”
He didn’t have to be told twice, hands sliding down to rest on Shouto’s tail. Lifting him away from the wall so that he was perfectly aligned with Bakugou’s aching dicks. With one long stroke he sunk in, the larger bottom tentacle sliding into Shouto’s hole as though it was made to be there, walls hugging so tight against him that his eyes rolled back into his head. Shouto looped his arms around Bakugou’s neck, clinging to him, whining, aching for more sensation.
“Fuck you’re so tight,” Bakugou groaned. “Never going to be able to fuck you full of both my cocks. So good for me.”
“Katsuki, I need-”
Bakugou moved, drawing back with one long slow deliberate slide before punching back in, setting a brutal pace that had them both clinging to one another. He braced his hands against the wall for more leverage, slamming his lower dick into Shouto over and over whilst the upper slid against his tentaclit.
He could feel the pressure building in his gut, tight and hot and desperate . He wasn’t going to last but it didn’t matter, he would have time to make it up to his mate over and over once they were properly mated that first time.
At the last minute, when he couldn't hold on any longer he leaned forwards, pressing his lips to Shouto’s shoulder, using his hand to guide his mate’s face to his own, and then when the pleasure overtook him he bit sinking his teeth deep, jerking and cumming harder when he felt Shouto do the same. Hard deep bites that would mark and scar, showing the world that they were a pair, bound together forever.
They remained there, licking the marks that they had made, clinging to one another until Bakugou’s cocks began to retract.
“Shouto,” he rumbled, a deep satisfied sound, nuzzling the man in his arms. “ Mate. ”
“Mate,” Shouto whispered back, the smallest hint of a smile in his voice. “I can’t believe you tried to eat me.”
“In my defense,” Bakugou huffed, “you are absolutely delicious, my pretty peppermint prey.”
He found himself pulled into a kiss, long and slow, all of the desperation gone.
Without another word Bakugou pulled Shouto up into his arms, holding him as he swam up from the bottom of the ravine, nuzzling the neck of his chosen as he swam towards what he hoped would be their shared home. The cave that he had coveted and protected for so long, finally ready for two.
They curled together there when night fell, his fingers running through red and white locks, a happy rumble in his chest when he saw the already mark on Shouto’s neck.
Making a silent vow to give his peppermint prince anything he ever wanted.