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It was a quiet afternoon in the Matsuno house. Most of the family was out for the day, leaving Choromatsu to stay home in peace. Having already got his usual masturbation session out of the way, he settled at the table in the living room to try and study his workbooks.
But the peace was soon interrupted by the sound of the front door slamming open. Choromatsu frowned and turned to the living room doorway, just waiting for one of his brothers to come bother him. Soon enough, the shoji was thrown open as Ichimatsu burst into the room. Red in the face and soaked in sweat, he looked like he ran twenty blocks to get here.
“Ch-Choromatsu, we've got a situation.”
The third eldest raised an eyebrow, and then noticed the cat carrier Ichimatsu was holding. “Did one of your cat friends get hurt?”
Ichimatsu shook his head and shut the shoji behind him. He knelt next to the table, and set the cat carrier on top of it. He took a shaky breath and turned to Choromatsu.
“Okay don't freak out. I'm already freaking out and I'm counting on you here, Choromatsu-niisan.”
Choromatsu nodded, steeling himself for whatever horror might step out of that box. The metal latch creaked as Ichimatsu pulled it back, letting the little door swing open.
Out walked a completely normal black cat.
It sat on the table and looked over at both of them in turn. Choromatsu looked at the cat, then at Ichimatsu, who still appeared to be stressed out of his mind. “What am I looking at here?”
“You don't recognize him?” Choromatsu shook his head. “It's— that's Karamatsu.”
“Ichimatsu,” he started, slowly, “Did you trade our brother for a cat?”
Ichimatsu spluttered, “No. This is Karamatsu.”
“Listen, I completely understand. I would trade Osomatsu for a goldfish if given the chance. But Mom will get mad at us, so you better go get him back.”
Ichi rolled his eyes, and turned his attention back to the cat. “Karamatsu.”
The cat looked at him intently.
“Stand up on your hind legs and spin around.”
The cat did just that, tottering on its little paws and doing a twirl.
“Sing that song we heard on the radio earlier.”
The cat yowled a short rendition of a tune that Choromatsu could vaguely recognize.
“Do something painful.”
The cat flashed him with sparkly anime eyes.
Choro gasped, then put his hand on Ichimatsu’s shoulder. “I'm sorry I ever doubted you.” He crouched down next to Karamatsu-Cat, Cat-Karamatsu, reaching out tentatively to… he wasn't even sure what he was trying to do. It might be weird to pet his brother. Though, admittedly, he made a cute cat. Karamatsu put his paw on Choromatsu's hand, looked him in the eyes, and smiled as much as a cat could smile.
With that out of the way, Ichimatsu explained what he thinks happened. He'd been walking home from pachinko (he was there with Osomatsu, who had ditched him for another parlor he thought was luckier without even telling Ichimatsu he was leaving) and he noticed this cat following him. He played with it a little, gave it some treats from his pocket (which it was hesitant to eat, but seemed to enjoy). But soon Ichimatsu had to keep walking, and the cat just wouldn't leave him alone. Pulling on his pant leg, weaving between his legs and trying to trip him, even trying to climb up his leg. Eventually, Ichimatsu picked it up and looked at it, figuring there must be something wrong with it. And that was when he looked in its eyes, and noticed it felt familiar. Then it meowed and it unmistakably sounded like “Ichimatsu”. That had him convinced.
Choromatsu followed this story with skepticism on his face, but Ichimatsu could tell he believed it too. It was hard not to. As he told the story, Karamatsu had climbed into Ichimatsu’s lap, curled up and purring. Choromatsu thought it was weird, but Ichimatsu just absentmindedly petted him.
“Shouldn't we do something about this?” Choromatsu said anxiously, “He can't stay like this forever… probably.”
“There’s gotta be a way to change him back. Who would know that… Dekapan, right?”
“Ah, good idea! You should call him!”
Ichimatsu nodded, then realized just what he was agreeing to. “...Me? Why do I have to?”
“Because it was your idea?” Choromatsu suggested, clearly not too keen on making a phone call.
Ichimatsu cursed under his breath. “But you're the oldest here!” He countered, “It's your responsibility!”
Choromatsu had no better excuses, so he conceded to make the call. He was probably the better choice anyway, he already knew how to make up a script for talking on the phone. He dialed the number and after a few rings, Dekapan answered. Choromatsu recounted the story, occasionally turning to Ichimatsu to check the facts before continuing on. By the end of it, Dekapan made a worried sound.
“Your brother did come in here earlier, dasu… He wanted to be more appealing to someone special, and asked if I could help. And of course I could.” There was a sound of glass bottles clinking as he seemingly looked through a shelf. “I gave him this— oh dear.”
“Eh? What is it?” Choromatsu asked, somehow more stressed than Ichimatsu now though he certainly wasn't that invested in Karamatsu's well-being.
“I must have given him the wrong bottle. I have the stable version of the medicine here… which means he took the unstable, experimental version, dasu.”
“E-Experimental? Will he be okay?”
“He should be fine, but the medicine will take some time to wear off… probably. For now, keep him safe indoors. You don't want him getting hit by a car, dasu.”
Choromatsu thanked him and hung up, then took a moment to let his tense shoulders relax. He may be the most proper of any of the brothers, but he was twice as anxious. He then turned to Ichimatsu (and Karamatsu, cradled in his arms) and relayed what he'd learned.
“Who were you trying to impress, anyway? Your ‘Karamatsu Girls’, I assume.”
Karamatsu just meowed at him.
Choromatsu sighed. “You know what? I don't care. I don't want to deal with this anymore.” He looked at Ichimatsu pointedly. “You’re the cat-lover here. This is your problem, not mine.” He stalked back into the living room and proceeded to ignore any move Ichimatsu made to get his attention. Seemingly defeated, Ichimatsu carried Karamatsu upstairs to their bedroom.
Ichimatsu shut the shoji behind him and set his cat-brother down on the floor before flopping down on the couch. Karamatsu hopped up beside him, his tail raised and curious, looking fairly pleased considering he was stuck in an animal's body. He rubbed his face against Ichimatsu’s hand until Ichimatsu started to pet him.
“So… impressing someone special, huh?” He chuckled, “I knew you loved grand gestures, but this is a bit ridiculous, isn't it?”
Karamatsu mewed and wriggled into his lap, already purring.
“You didn't need to do this. I already loved you as you were. Though… this does have its perks.”
He pet the soft fur on Karamatsu’s neck, feeling the rumbling in his chest. Who knew his brother would make such a cute cat? Ichimatsu almost couldn't handle it, like looking at him made him want to explode. He just couldn't keep his hands off of him, stroking his head down to his back, hugging him tightly, playing with his cute little paws, burying his fingers in his thick belly fur. Karamatsu took everything Ichimatsu gave him, pressing closer for more, purring like a motorboat. Though he couldn't speak, he slow-blinked at Ichimatsu, signalling that he was relaxed and happy.
Normally, Ichimatsu wouldn't mess with a cat that much. Cats could be very fickle, and he didn't want to miss the subtle signs that it wasn't enjoying itself. But that worry was far off right now, as he knew Karamatsu would never tell him to stop. Ichimatsu pressed his face into Karamatsu’s warm belly, nuzzling his nose into the fur. He was so happy he almost felt delirious. Perhaps without realizing, he murmured, “Mm, good boy, good boy… You're so cute, niisan…” Karamatsu mewled and licked Ichimatsu’s hair, squirming in his grasp.
Ichimatsu rolled onto his back, picked up Karamatsu, and set him on his chest before resuming his vigorous petting. He'd never gone all-out with his affections like this before, but it was so much fun, even with Karamatsu standing a little too heavily on his chest. He couldn't possibly mind, not with that happy little kitty face above him.
His hand traveled down Karamatsu’s back, scratching at the base of his tail. Karamatsu shivered in enjoyment. He chased the feeling when his brother’s hand withdrew, turning around to bring his rear closer to Ichimatsu’s hand and subsequently his face. Ichimatsu got an eyeful of feline asshole, and he couldn't help but laugh at the absurdity of their situation. Still, he scratched at Karamatsu’s tail again.
“I’m glad you were able to find me,” he said musingly, “It would be terrible if you got lost outside. Better to be safe at home.”
He tried not to stare directly at his brother’s hole, but it was just right there, as were his furry little balls. Feeling a sick sort of excitement, Ichimatsu grasped Karamatsu’s tail, holding him in place for just a moment.
“It's a good thing you weren’t picked up by animal control, huh? They’d have snipped these right off.” He poked at Karamatsu’s testicles, earning a small squeak. “What a waste.” He leaned forward, slightly uncomfortably but he didn't care, to nuzzle his junk. Even back here the fur was so soft and pleasantly warm. His tongue darted out of his mouth to give Karamatsu a little lick.
He hardly paid attention to what the other end of Karamatsu was doing, not until he felt a paw pressing against his crotch. Fuck, when did he get that hard? Shame finally caught up with him, and his cheeks burned. He suddenly shoved Karamatsu off of him, and sat up with his knees pulled close to his chest.
Karamatsu bristled as he tumbled unceremoniously to the floor. He didn't seem to take it personally— Ichimatsu hadn't really meant to push him that hard— and he hopped back up onto the couch looking a little confused. Without language, he couldn't ask why Ichimatsu had pushed him away. All he could do was rub up against his legs and try to climb up over his knees, even if the process of it left Ichimatsu’s sweatpants full of pinprick holes. Perched on his brother’s knees, he peered at his unnerved face and meowed questioningly.
“Go away, Shittymatsu,” Ichimatsu grumbled, making no effort to remove him, “I need some space, go bother someone else.”
Karamatsu leaned forward to nose at Ichimatsu’s face, but he lost his footing and slipped down into his lap. Ichimatsu grunted, the sudden weight on his erection a little painful. He let his legs uncurl so the cat rolled off of him. Karamatsu sprang to his feet, victorious. He strutted back to his rightful spot on Ichimatsu’s lap and placed a paw on the tent in his pants.
“N-No, don't touch that—” Karamatsu pressed more insistently, making Ichimatsu groan under his breath. He had to know what it meant, right? It wasn't just that it was Karamatsu, but that he looked like this… He'd long since come to terms with this particular fantasy, but he never intended for Karamatsu to find out. That was just too embarrassing! His brother-boyfriend couldn't know he was such a degenerate pervert!
He pushed the paw away, gently. “I can take care of this myself, alright? You don't have to do anything, Karamatsu. I- I can wait until you're you again, just leave it alone.”
Karamatsu’s head drooped, sulking. He meowed something that was clearly an attempt at words, but Ichimatsu couldn't make heads or tails of it. Carefully, he stepped around Ichimatsu’s crotch and propped himself on his hind legs, his forepaws resting on Ichimatsu’s chest. He licked at Ichimatsu’s cheek, maybe an apology? Or a kiss of sorts. Ichimatsu smiled and gently pet his side, glad that Karamatsu understood.
Until one of those hindpaws clumsily stroked his bulge. Ichimatsu groaned at the touch, and went to push Karamatsu away again. But his feline brother dug his claws in— through fabric and into his skin, even— determined to stay put.
Defeated, Ichimatsu grit his teeth and let Karamatsu have his way. He'd never seen a cat look so smug, and that was saying something. As soon as Ichimatsu relaxed, he retracted his claws and turned his attention to his brother’s cock. With careful paws, he kneaded the bulge in his sweats.
Ichimatsu leaned his head back against the back of the coach. He didn't want this to be happening, but he didn't have it in him to put up a fight. At least Karamatsu couldn't outwardly judge him when he couldn't talk. His paws worked him clumsily, but there was a charm to it. Ichimatsu let out a shaky breath, way too into this. He was so hard and Karamatsu’s touch was so teasing… He wanted to know what that sandpaper tongue would feel like on his cock. Bad, probably. But he wanted it, he's always sort of wanted it.
“Karamatsu… Is it— would it be okay if I… you know…” He hooked his thumb into his waistband.
Karamatsu immediately understood and hopped out of the way. His eyes sparkled with expectation.
A sick smile pulled at Ichimatsu’s lips despite his effort to suppress it. He pulled out his cock, and a visible shiver went through Karamatsu's little body. Ichimatsu never knew a cat could look so sultry. Leave it to Karamatsu to know how to swing those feline hips just right. He sauntered back over, planted his paws on Ichimatsu’s thigh and leaned in toward his cock. Ichimatsu wondered if his senses were heightened, what might it smell like. Judging by his expression, it must have been good.
Karamatsu rubbed against him with his wet little nose, his soft furry cheek, his plush gentle paws. It was difficult, but he managed a few decent strokes by grasping Ichimatsu’s shaft between his paws, slowly and inefficiently jerking him. Still, Ichimatsu was already leaking like a broken faucet, harder than he'd ever been, red-faced and unable to stop grinning in a way that made him look and feel like a disgusting creep. Karamatsu didn't seem to mind that, or maybe he was just used to it. He purred as he worked, his tail twitching playfully.
And then suddenly the first rough lick, sending shudders through Ichimatsu’s body. It was painful but warm, just a bit wet, and so small. He couldn't cover the area that human Karamatsu could, and Ichimatsu wouldn't expect to be fitting inside his mouth (and definitely not with those sharp teeth) but the experience is new and exciting. His tongue passed over Ichimatsu’s tip, swiping through the precum gathered around his sensitive slit, and Ichimatsu groaned and bucked his hips. Karamatsu dug his claws into his brother’s thighs to keep from being thrown off, earning another moan.
Ichimatsu’s hand settled on the cat’s back, petting him slow and firm. As his hand slid back up to Karamatsu’s head, he grabbed at his scruff, not pulling him away but just holding, his dull nails digging into the skin. Karamatsu’s eyes rolled back for a second but he dutifully kept licking and nuzzling his cock. His hips raised up instinctively and his tail curled back, as if his body was asking Ichimatsu to mate with him. Ichimatsu shivered at the thought, his cock twitching.
He wouldn't dare do any of this with a real cat— that would be cruel, and he could never be cruel to an animal, least of all a cat. A human sure, he had no qualms about that. But never a cat.
But Karamatsu wasn't a cat, not really. His human mind was still conscious, piloting this feline body. He was licking Ichimatsu’s cock of his own volition, out of the love they share. He understood. Better still, he apparently wasn't judging Ichimatsu for getting horny over a cat. What a good brother he was, such a good boyfriend.
“K-Karamatsu, stop.”
Karamatsu stopped and looked up at him questioningly. His little pink tongue was sticking out of his mouth slightly. God, he's so fucking cute like this, Ichimatsu nearly spilled then and there.
“I wanna do it on your face, o-okay?”
Karamatsu nodded, climbed off of him and laid on his back on the couch cushions so Ichimatsu could lean over him. He was so cute, Ichimatsu just couldn't get over it. And now he could see his little nipples, pinkish grey against the black fur. Ichimatsu’s eyes traveled a bit lower, down to his cock peeking out of his sheath. Fuck, he’d fantasized about this view more than anyone really should. Wasting no time, he wrapped his hand around his cock, and in just a few pumps he was coming, splattering that pretty black fur with white. Most of it made it onto Karamatsu's face, some even landing in his open mouth. The rest dirtied the thick fur on his chest like a collar.
Sated, Ichimatsu slumped back onto the couch to rest for a second. He watched Karamatsu idly as he cleaned himself, taking advantage of his new feline flexibility to lick up most of the cum. Ichimatsu only needed to help a little, cleaning off his face with some tissues.
He leaned down and kissed his kitty brother, heated breath against those unmoving furry lips. Karamatsu couldn't kiss back very well, but he licked at Ichimatsu’s lips with his rough little tongue. Ichimatsu pet his soft belly, rubbing purposefully against his nipples to make him mewl and squirm. It must feel odd to suddenly have more than just two, Ichimatsu thought. He buried his face in Karamatsu’s soft belly, taking a moment to just enjoy the warm fur, before he tilted his head and wrapped his lips around a nipple.
It was so strange to hear the familiar sounds of a cat in heat, while knowing that he was the cause. He felt almost dizzy, deliriously horny and so, so happy. He didn't even care how much fur was in his mouth right now. All that mattered was the little teat between his lips. He teased it with his teeth, rubbed and pinched at the others with his hands. Kara twisted and squirmed, his tail thrashing. He hooked his front paws on Ichimatsu’s shoulders, pressing and almost digging his claws in, his hind paws batting at Ichimatsu’s chest, but he wasn't nearly strong enough to push Ichimatsu away even if he wanted to.
Once he felt he'd sufficiently played with Karamatsu’s nipples, he moved lower. Karamatsu’s cock was fully erect now, small and bright pink. Below the pointed head were a few rings of small barbs, which Ichimatsu regarded carefully. How sharp were they, he wondered. Would they hurt him if he tried to suck him off?
He ran his finger down from the tip, over the smoother side of the barbs. In his fantasies, he purposefully forgot this aspect. They're more intimidating than he thought, and he's glad they won't be going inside him. The tip leaked a little as he rolled it between his fingers.
“I don't know if you, uh, investigated down here yet.” Karamatsu's ears perked up as he was spoken to.
Ichimatsu chuckled, “This is probably the most intimidated by you I've ever felt.”
Karamatsu awkwardly sat up, staring down at his cock. It was much more foreign to him than the fourth eldest, since he didn't previously take such an interest in cats. Little sounds spilled from him as Ichimatsu toyed with his cock, but he couldn't buck up into his touch when he was prone on his back.
In the back of his mind, Ichimatsu worried that if he tried to lick him, his tongue would be hooked on those little fish hooks. But he wanted to— no, he needed to know what it tasted like.
“H-Hold still, niisan.” He wrapped his hands around Karamatsu’s middle, feeling the dull vibration of his purring that told him everything was okay and he was free to continue.
He scooted down on the couch, leveling his face with the cat’s crotch. The smell was strong and strange, so unlike Karamatsu's natural scent but alluring all the same. He took a deep inhale, grinding himself against the cushions. Though he just came, he had perked back up in record time, unsurprisingly. He could just as easily get off like this, shamelessly humping the couch and nuzzling his nose into Karamatsu’s furry balls. He licked over them, making Karamatsu squirm again. He hissed something about staying still, to which Karamatsu meowed apologetically.
Finally, he slid his tongue down Karamatsu's cock, over the smoother side of the barbs. He teased the tip with his tongue, to coax the precum into his mouth. It was musky, salty, definitely not good but Ichimatsu moaned at the taste anyway. He couldn't not, he'd fantasized about this for so long.
Perhaps against his best judgment, he took Karamatsu into his mouth. Try as he might, it was impossible to avoid the barbs, but at this point he hardly cared. They tore at his tongue, ripping a whine from his throat. Pleasure bloomed in his gut all the same, and he ground down on the cushion beneath him.
Soon Karamatsu came, yowling as he spilled in Ichimatsu’s mouth. There wasn't much, and Ichimatsu wouldn't dare spill a drop. He savored the thick flavor of it on his tongue, the strange texture as it slipped down his throat. Karamatsu panted, his mouth hanging open, his whole body limp.
Ichimatsu sat up, surveying his work. “Are you alright? Did it feel good?”
Karamatsu nodded and purred weakly. He was tired, but would recover soon enough while Ichimatsu gently pet his head. When he decided he was finished, he rolled onto his feet and pressed himself against Ichimatsu, purring and nuzzling him sweetly. Ichimatsu guessed he was having a good time.
“There is, er… one more thing, you know,” Ichimatsu suggested, gesturing to his erection, “If you're up for it, of course.”
Karamatsu cocked his head to the side, and Ichimatsu could practically see the gears turning in his head. It seemed that he wasn't any smarter as a cat. He was so innocent sometimes, it was endlessly endearing. And then he realized what Ichimatsu had meant and immediately bristled, his tail puffing up into a bottlebrush.
It sure looked silly, but it spurred Ichimatsu to backpedal, flooded with shame. “We don't have to! I- I shouldn't have even brought it up, j-just forget about it, okay?”
This was met with a hiss, a flick of his tail, and then an affectionate headbutt. Ichimatsu couldn't decipher the meaning for the life of him. He allowed the cat to climb into his lap again, and held his paws while he stretched up toward him for a kiss. He wondered if Karamatsu really got anything out of it, or if he only offered out of habit. This train of thought was derailed completely when Karamatsu pressed his ass against Ichimatsu’s erection.
“E-Eh? You want to?”
Karamatsu nodded.
Ichimatsu broke out into a wobbly smile, his face bright red. “K-Karamatsu… I love you so much.”
Karamatsu meowed, and it sounded a lot like ‘I love you too’.
Ichimatsu gave him an affectionate scratch behind the ears, before setting him to the side so he could go find the lube. Him and his disgusting horny brothers seemed to have hidden stashes of it all over the house, especially in the bedroom. Ichimatsu found one in no time, probably Choromatsu’s since he was the worst at hiding it. After retrieving the little bottle, he undressed and kneeled on the couch.
“I’ll try to make it not hurt, but tell me if it does.” He patiently guided Karamatsu into the proper position— crouched, with his hips raised and his tail curled to the side. Ichimatsu stroked the base of his tail, making a visible shiver go up his spine. God, he was so cute. Ichimatsu leaned down and gave his little pink hole a lick, resulting in a small yelp of surprise. Karamatsu tensed up at first, but as Ichimatsu kept licking him he relaxed and even pushed back against his tongue.
While he kept Karamatsu busy with his tongue, he blindly lubed up his fingers, letting the cold liquid warm to his body temperature. He could feel his brother’s hole begin to ease up, allowing the tip of his tongue to push inside. Despite the discomfort he was surely feeling, Karamatsu purred all the while. Ichimatsu could feel the vibration of it on his tongue. He pushed further inside, drawing lovely sounds from Karamatsu as he worked him open.
When he seemed loose enough, Ichimatsu replaced his tongue with a finger. Karamatsu bristled a little as it entered, but he stayed in his position.
“That's it, good boy,” Ichimatsu praised him quietly. His free hand stroked his back, as a sort of distraction. He opened him gently, carefully, slower than he ever has. He didn't quite know what his body can take, and didn't want to push his limits more than he already definitely is. His cock ached, but he refused to rush even a second of this. His fingertips mapped the contours of Karamatsu’s feline insides, testing the stretch and slick softness. He'll never experience this again, he wanted to feel all of it. He poured a little more lube over his hand as he slid another finger inside.
Soon enough, Karamatsu was slowly fucking himself onto his fingers, and making strange sounds Ichimatsu had never heard from a cat, as close to human moans as he could make. Ichimatsu scissored his fingers and stretched him wide, Karamatsu whining and leaking onto the couch cushions all the while. He was a little surprised at just how much it seemed he could take. Even with four fingers stuffed inside, he didn't struggle at all. Well, it was Karamatsu, after all. Ichimatsu smiled to himself.
“I think you're ready...” he said, his voice breathy from how turned on he was, “Can I put it in? Do you want that?”
Karamatsu craned his neck, tossing a look back at Ichimatsu as the most debauched meow fell from his lips. Ichimatsu took that as a yes.
He pulled his fingers out of the cat, and carefully coated himself in a frankly excessive amount of lube, so much that it was dripping down his legs. He wanted to be extra prepared. He loomed over Karamatsu, watching him shake his hips and presenting himself to his boyfriend. Ichimatsu rested his hand on the cushion beside him, the other guiding his cock to press up against that loosened hole. Heat was coming off of Karamatsu in waves, and the purring sent a dull vibration through Ichimatsu’s dick. He took a deep breath to steady himself, then began to push inside.
It was tighter than anything he'd ever felt, almost impossible to get inside. Ichimatsu scrabbled for the discarded bottle of lube and squeezed more over himself and Karamatsu’s hole. That eased it a bit, and he slid inside a little more. He doesn't expect to fit inside fully, but just a couple inches would be amazing. He sighed shakily as Karamatsu’s inner walls attempted to strangle his cock.
“How… How are you feeling,” he panted, his free hand coming up to stroke Karamatsu's back.
Karamatsu turned his head, just barely enough so he could see Ichimatsu from the corner of his eye. His face was scrunched, in pain or concentration, but he made an effort to make a reassuring meow. He wanted Ichimatsu to continue.
The longer he was inside, the more Karamatsu’s small body grew to accommodate him. The muscles inside him relaxed, allowing Ichimatsu to delve deeper, and soon thrust slowly in and out. Some of the tension in the cat’s shoulders released, and he began to make sounds of enjoyment along with his brother.
Almost embarrassingly quickly, Ichimatsu found himself getting close. He could hardly call it a surprise— his dream is coming true right before his eyes, and kitty Karamatsu’s ass is better than he could have ever imagined. As much as he'd like to release inside him, he thought better of it.
“K-Karamatsu, I’m gonna—” He started to pull out, but Karamatsu hissed at him.
“Huh? B-But Karamatsu, you're—”
Karamatsu hissed again, baring his fangs. But he was still purring. The meaning came across.
Was it even possible? Would it hurt him? Ichimatsu was barely keeping himself together, but the last thing he wanted to do was hurt his brother. But Karamatsu seemed to know what he was doing… and it was his body, after all. Admittedly, Ichimatsu couldn't wait to see his cum dripping from that abused little hole. He grunted, “Here it comes, niisan.” Then he tumbled over the edge.
With a gasp, he came inside Karamatsu. Those tight kitty walls milked him for all he was worth, spasming as Karamatsu released all over the couch cushion beneath him. The yowl that escaped him could shatter glass, but it was sweet music to Ichimatsu’s ears.
He slumped back against the arm of the couch, sliding unceremoniously out of Karamatsu. The cat remained as he was, catching his breath, allowing his younger brother a precious moment to admire his handiwork. His gaping hole, the slow trickle of white oozing out of him and matting his fur… When he looked back at Ichimatsu, his eyes were still hazy and unfocused, but Ichimatsu could have sworn he was smiling.
Suddenly, there was a puff of white smoke. Ichimatsu coughed and tried to fan it away with his hands, before he became aware of the extra weight on the cushions. Karamatsu— human Karamatsu was lying there, apparently back to normal. He was still sweaty and naked, still leaking cum, but most certainly human.
Ichimatsu would have wished to have him as a cat for a little longer, but he was rather relieved to have him back. He draped himself over his older brother, and sweetly kissed his cheek and then his lips. God, he missed these human lips that could kiss him back.
“I missed you,” he mumbled into the kiss.
“I didn't go anywhere, brother. And it seems my predicament helped you, er, fulfill a particular desire of yours.”
“Heh, you could say that.”
“Never before have I been showered by such love! Such gentle yet rigorous touches! The way I felt when you pet me like that… I shall never feel that way again.”
Ichimatsu gave a performative wince. “Painful,” he chuckled, “You were much quieter as a cat.”
“You would wish for me to be quiet? But then how would I profess my undying love for you, brother? How would I detail exactly how it feels to have you inside me?” He lowered his voice as he looked Ichimatsu in the eye, “Don't you want to know exactly how it felt? To be fucked like that? No ordinary cat could report on it.”
Ichimatsu burned with embarrassment and buried his face in Karamatsu’s neck. “Don't say it like that,” he said, half-laughing.
“Eh? But you want to hear about it, don't you? You're into that?” He ruffled Ichimatsu’s hair playfully. “I won't judge you, my honey. I let you do it, didn't I? It's not exactly surprising, coming from you.”
He was quiet for a moment, then said, “I’m not exactly opposed to… to doing it again…”
Ichimatsu’s head shot up, wide-eyed and red-faced. His rather intense stare made Karamatsu blush and stammer, “If you want to, of course! I just— You seemed to really like it, a-and I like doing things that you like…!”
He somehow looked more flustered than Ichimatsu, and the fourth eldest couldn't help but crack a smile at that. “Maybe someday,” he said, “But right now, I want to enjoy you like this.” He leaned down to kiss his brother, feel his hands on his waist and the back of his neck. In their absence, he suddenly appreciated all the uniquely human aspects of Karamatsu. He would need to take his time and reacquaint himself.