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We Call It Love (It's Natural)

Summary:

“'Shh,' Jaemin says soothingly. 'Nana will take care of you.' He kisses Jeno’s cheek softly. 'Be a good puppy for me, hm?'

Jeno nods without thinking too hard about it – he always wants to be good for Jaemin, no matter the context. 'Nono w-will be good.'

Jaemin smiles at that, kissing the corner of his mouth this time. 'I know you will,' he coos. 'My sweet boy.'”

Or: Puppy hybrid Jeno goes into rut for the first time and doesn't understand what's happening to him. Luckily, he has Jaemin, who's more than willing to teach him.

Notes:

(See the end of the work for notes.)

Work Text:

Cold, wet rain. Huddled in a box, shivering and whining quietly. Stomach aching. 

An unfamiliar voice. “Oh, you poor thing!” Wrapped in something fuzzy and warm, held in careful arms. “How could someone just leave you out here like this? You’re trembling so much, pup.” Whimpering. A fleeting kiss on the head. “Shh, it’s okay. You don’t need to be afraid anymore. I’m going to bring you home and look after you from now on.” 

A short walk. Warm air and bright lights. Placed on a comfortable pillow, petted tenderly. “You need a bath, food, and water. Which one first?” 

Stomach grumbling. A soft laugh. Scratched behind the ears. “Okay, food and water it is.” 

Meat in a bowl. Water in a bowl. Eating. Drinking. “Whoa, slow down a little. You’ll make yourself sick if you eat too fast.” A sad smile, more head pats. “You must have been out there for a while if you’re this hungry, huh?” 

Emptying the bowls. Looking into kind brown eyes. “Do you want me to bathe you like this? Or would you prefer doing it yourself in human form?” 

Nuzzling into a hand, licking tentatively. An affectionate cooing sound. “All right, I’ll do it for you.” 

Warm, soapy water. Peach scent. Scrubbed and washed by gentle hands, dried by a fluffy towel. Placed on a large bed. “There, you look so handsome now. Your fur is beautiful, you know.” 

Wagging tail weakly. A sweet smile. “You like being called handsome? You really are, pup, you’re such a gorgeous Samoyed. And once you’ve had a few good meals, you’ll look even nicer.” 

Breathing deeply. Then – 

“Oh!” The man sitting next to him on the bed startles as Jeno shifts into his human form, fully naked on the sheets. He looks away from Jeno hurriedly and points to a pile of neatly folded clothes at the foot of the bed. “Those are for you. I was worried that they might not fit you, but it looks like we’re about the same size, so I think you should be fine.” 

Jeno is surprised as he puts the clothes on. They must belong to the man, based on what he just said, which means that he was thoughtful enough to manually cut out a hole in the pants for Jeno’s tail. “Th-Thank you,” Jeno says, his voice hoarse from lack of use. 

“It was no problem,” the man says, his tone friendly as he turns to face Jeno again. He’s smiling now, and it’s a very pretty smile, Jeno thinks. It isn’t as if Jeno has been on the receiving end of many smiles in his life, but this one is probably the prettiest he’s ever seen. “Do you know where you are right now?” 

Jeno looks around, taking in his surroundings. “Nono is in a bedroom,” he finally says. 

“Nono?” the man asks, cocking his head. 

“Nono,” Jeno repeats, pointing to himself. “Jeno is Nono.” 

“Jeno,” the man says slowly. “That’s your name? And Nono is your nickname?” Jeno nods, happy that the man understood so quickly. “It’s nice to meet you, Jeno,” the man says, breaking into a smile once more. “My name is Na Jaemin. And my nickname is Nana.” 

“Nana,” Jeno says. He prefers that name, he decides. Jaemin is a nice name too, but Nana matches with Nono and Jeno likes that. “Nana saved Nono and brought Nono home. Now Nana is Nono’s master.” 

Jaemin’s smile wavers slightly. “N-No, I – I’m not your master, Jeno,” he says. 

Jeno’s eyes immediately sting with tears. He’s certain that he heard Jaemin say he was going to take care of Jeno from now on – did he do something wrong to change Jaemin’s mind? “Nono was bad? Nana...Nana doesn’t want Nono?” he asks, trying to hide his sniffles. Jaemin has been kind up to this point, but now Jeno can’t help but wonder if Jaemin will punish him for crying like his former master used to. “Nana will send Nono out again?” 

“No!” Jaemin says frantically, sounding even more distressed than before. “No, you weren’t bad at all! And I’m not going to send you out again, of course not! I didn’t mean – I just don’t want you to think that I-I own you or something. We...we can be friends, okay? Not master and hybrid, but friends.” 

“Friends,” Jeno says softly, awed. He’s almost twenty-one years old, but he’s never had a human friend before. “Nana is...Nono’s friend.” 

“That’s right,” Jaemin says, his smile reappearing as he relaxes. “We’re friends. And I’m going to make sure you never experience anything like what you did before ever again. I promise.” 

Given what the past few weeks of his life have been like – what his entire life up to this point has been like, really – Jeno knows he should probably be wary of Jaemin, who’s technically still a stranger. But somehow, between Jaemin’s thorough, meticulous care in the short time they’ve known each other and his sweet, pretty smile, Jeno finds that he believes him. 

~~~ 

“Nono, I’m home!” Jaemin’s voice drifts through the apartment, accompanied by the familiar sounds of him pulling off his shoes and placing his keys on the kitchen counter. Normally, Jeno would have perked up immediately as soon as he detected Jaemin’s presence, would have already been in front of the door the moment he heard the key in the lock. After all, Jaemin is his favorite person in the world, and him coming home after work is always, without fail, the best part of Jeno’s day. 

But today, Jeno can’t focus on any of it, because there’s something happening to him, to his mind and his body, that he’s never experienced before, and he’s been desperately waiting for Jaemin’s return so he can find out what’s wrong. After all, surely Jaemin – smart, kind, thoughtful Jaemin, who’s taken such good care of Jeno since the day he saved him from a life on the streets – will know what to do to get Jeno back to normal. 

“Nono?” Jaemin calls, sounding slightly confused now, and Jeno knows it’s because he hasn’t run out into the living room to welcome Jaemin home. “Jeno, baby, where are you?” In his heightened state of sensitivity, Jeno can’t help letting out a whine at his favorite term of endearment. That, apparently, is enough to give away his location, because moments later, Jaemin walks into the bedroom, looking worried. His expression only becomes even more concerned when he spots Jeno curled up on the bed with tears in his eyes. 

He’s by Jeno’s side within seconds, sitting on the edge of the bed and stroking Jeno’s hair. “Oh, sweetheart,” he says softly. “Why didn’t you call me earlier, hm?” 

“Nana,” Jeno manages to say, blinking up at Jaemin through his tears. “H-Hurts. Nono hurts d-down there.” In the six months since Jaemin took him in, Jeno has made significant progress in unlearning the childish way of speaking he was forced into by his previous master, but right now, his mind is too preoccupied for him to concentrate on avoiding it. 

"I know, baby,” Jaemin says, scratching behind Jeno’s ears now, and despite how uncomfortable he feels everywhere else, Jeno wags his tail weakly at Jaemin’s comforting touch. “I know it’s terrible, but unfortunately, it’s going to hurt for a while.” 

“Wh-Why? Why does it hurt?” Jeno asks, already feeling slightly relieved – just as he thought, Jaemin knows what’s wrong and can explain it to him. 

“Your rut is starting,” Jaemin says gently. “You’ve never had a rut before, have you?” 

Jeno shakes his head, sniffling. “What...what’s a rut, Nana?” 

Jaemin sighs, and he seems strangely tense now. Jeno wants to soothe him, but the throbbing between his legs is only growing more intense. “A rut is something that alpha puppy hybrids start having when their body is ready to mate,” Jaemin says. “Yours started a little later than usual because of everything that’s happened to you, but you’re going to have one every three months or so from now on.” 

“Don’t wanna,” Jeno says, frowning. It doesn’t make sense to him that he’ll have to experience this awful feeling so often. “Don’t like it.” 

“There are ways to deal with it so it doesn’t feel bad,” Jaemin says, squeezing his hand reassuringly. “In fact, it’ll actually feel pretty nice. But I’ll have to run out again and buy you some toys, and I’ll find some videos to teach you how to use them too...oh, and I’ll also need to double check that we’re stocked up on protein and water bottles, and –” 

“Why?” Jeno interrupts. “Why does Nana need to buy toys?” 

“These aren’t regular toys, Nono,” Jaemin explains. “They’re toys that’ll make you feel really good, okay? They’re going to help you through your rut.” 

Jeno cocks his head, pouting slightly. “Nana...Nana can’t help?” 

Jaemin inhales sharply. “Baby,” he says carefully. “I can’t. A rut happens because your body wants to breed someone, usually your mate. Do you understand?” 

“Nono understands,” Jeno says, tears starting to roll down his cheeks. And he does. He knows exactly what Jaemin is saying, but he still doesn’t get it – why doesn’t Jaemin want to help him? “Nana d-doesn’t want Nono to breed him or, or to be Nono’s mate?” It’s a devastating thought, considering Jeno has known that he wants Jaemin to be his mate for at least three months now. 

“That – that’s not – Jeno, I –” Jaemin stammers, looking flustered all of a sudden. Jeno doesn’t think he’s ever seen Jaemin blush so hard before, and under any other circumstances he would have admired how pretty Jaemin looks like this, but right now, the sight just makes his lower half hurt even more. 

“Please,” he whimpers, and he’s fully crying now. “P-Please, Nana? Nono will be good, Nono will breed Nana so he’s full of Nono’s pups, please –” 

“Fuck,” Jaemin whispers. “I can’t.” 

Jeno has never seen the expression that’s currently on Jaemin’s face before. Jaemin’s eyes are dark, his pupils blown wide, and Jeno squirms in place on the sheets, moaning softly. He wants Jaemin’s hand stroking his hair again, wants Jaemin to touch him down there too – and as soon as that thought crosses his mind, he feels like he might die if Jaemin doesn’t. 

“Nana,” Jeno hiccups. “P-Please touch Nono. It h-hurts.” 

Jaemin places a hand on Jeno’s face and strokes Jeno’s cheek with his thumb tenderly. “I know,” he says, sounding a little broken. “I’m so sorry I didn’t explain it to you sooner. I didn’t think...I figured that monster did what he did to you because he wanted an omega hybrid, but I thought he would’ve at least taught you something after you presented...I’m really sorry, sweetheart.” 

Jaemin does this sometimes – blames himself for things that are solely the fault of Jeno’s former owner – and it always upsets Jeno to hear it. “Not Nana’s fault,” he says with as much conviction as he can in his current state. He turns his head and nuzzles into Jaemin’s palm, pressing a tiny kiss against it and inhaling Jaemin’s familiar comforting peachy scent. “Nono j-just wants Nana. That’s it.” 

And that apparently breaks Jaemin’s resolve, because he exhales shakily, his expression serious. “Jeno, are you sure?” he asks. “Absolutely, one-hundred percent sure?” 

“Yes,” Jeno says without hesitation. “Nono is sure. Nono wants Nana to help.” 

“Okay,” Jaemin says, swallowing hard. “Okay, baby. Nana will help you.” He leans in and kisses Jeno’s forehead gently. “Just give me a few more minutes to prepare everything, and I’ll be back before you know it. Can you wait just a little longer for me, pup?” 

Jeno nods. “Nono can wait,” he says as confidently as he can, and Jaemin smiles at him, which makes him feel even more sure of himself. No matter how much it hurts, Jeno can hold out for as long as Jaemin needs him to, now that he’s certain that Jaemin is going to help him feel better very soon. 

True to his word, Jaemin is gone for no more than fifteen minutes before he returns to the bedroom. Jeno watches through teary eyes as he places a box filled with water bottles and protein bars next to the bed before joining Jeno again. He’s changed into sweats, Jeno vaguely registers, and the ends of his hair are a bit damp, like he washed his face hurriedly. He looks even more soft and cuddly than usual – Jeno wants to press himself against Jaemin and nuzzle into his neck and have Jaemin touch him where he’s throbbing between his legs. 

“Hey sweetheart,” Jaemin says in a hushed tone, cupping Jeno’s cheek again and kissing his nose. “You definitely still want me to help you?” 

“Nono wants it,” Jeno says, determined. “Nono wants Nana to be his mate.” Jaemin’s breath hitches, but Jeno doesn’t dwell on that – he’s already guiding Jaemin’s free hand down to where it hurts most. And when Jaemin’s hand makes contact there for the first time, Jeno lets out a sound he didn’t know he was capable of making, bucking his hips up in an attempt to feel the intense spike of pleasure again. 

“More, m-more,” he pants, feeling dizzier with each passing moment. “Nana, please, please, i-it feels –” 

“Shh,” Jaemin says soothingly. “Nana will take care of you.” He kisses Jeno’s cheek softly. “Be a good puppy for me, hm?” 

Jeno nods without thinking too hard about it – he always wants to be good for Jaemin, no matter the context. “Nono w-will be good.” 

Jaemin smiles at that, kissing the corner of his mouth this time. “I know you will,” he coos. “My sweet boy.” Jeno whines quietly, his skin burning where Jaemin kissed it, only to let out a startled moan when Jaemin climbs on top of him and kisses his lips a moment later. 

Jeno tries his best to kiss back, placing his hands on Jaemin’s waist. He’s never kissed anyone before, but he wants it to be enjoyable for Jaemin, so he follows Jaemin’s lead. When he feels Jaemin’s tongue gently but insistently trying to part his lips, he obediently lets Jaemin lick into his mouth, whimpering when Jaemin sucks on his tongue and grinds himself against Jeno’s lower half. It’s such an overwhelming, wonderful sensation that something unexpected happens – his hips buck up involuntarily as the pressure that’s been building between his legs momentarily lessens, and something releases inside his pants, leaving them wet and sticky. 

It felt good – really, really good – and Jeno’s head is clearer than it was before, but Jeno isn’t sure if it was supposed to happen or not. “Nana,” he says uncertainly. “It...it’s wet.” Jaemin sits up and looks down at Jeno’s pants, his expression unreadable. Jeno suddenly feels like hiding – what if he did something wrong and made Jaemin upset? “Nono is sorry!” he blurts out before Jaemin can say anything. “Nono d-didn’t mean to.” 

Jaemin looks taken aback for a moment before his face softens in understanding. “Sweetheart, it’s okay, you didn’t do anything wrong,” he says. “That was supposed to happen. It felt good, right?” Jeno nods shyly, and Jaemin smiles, leaning in to kiss Jeno again. “It’s called an orgasm,” Jaemin explains when they pull apart. “You’re going to have a lot of them while you’re in your rut, so don’t feel bad, okay? It’s a really good thing, I promise. It – it means that your body is doing what it needs to so that you can breed your mate.” His cheeks are dusted with pink again as he says the last part, and Jeno thinks that he’s surely the most beautiful person in the world. 

“What made my pants wet?” Jeno asks, eyeing the dark spot that formed on his crotch when he had his orgasm. 

Jaemin’s cheeks flush even darker. “That’s your, ah, your cum,” he says. “After you put your cock inside your mate and come, that’s what you, um, fill them with so that – so you can give them your pups.” 

Jeno thinks about it for a moment. “I’ll put my cock inside Nana and fill Nana with my cum,” he concludes. “And then you’ll have my pups.” 

“Um,” Jaemin squeaks. “I mean, that’s not exactly –” 

“Nono is a good puppy,” Jeno says, determined. “I can fill Nana with lots of cum so you can have lots of pups.” 

“Fuck,” Jaemin says breathlessly. “Okay, y-yeah, baby. You can.” He bites his lip, looking slightly nervous – Jeno watches him do it and decides that he wants to be the one biting it instead. 

“Can we kiss more?” Jeno asks. His cock is starting to hurt again, and he wants nothing more than to feel Jaemin rutting against it. “And – and can Nana touch my cock?” 

Jaemin makes a soft little sound, and Jeno can feel something hard in Jaemin’s pants pressing against his stomach. “Of course,” Jaemin says hoarsely. “Nana will kiss you and touch your cock as much as you want.” 

This time, when Jaemin leans in for a kiss, Jeno experimentally nips at Jaemin’s bottom lip like he just imagined doing. The effect is instantaneous – Jaemin gasps, the hardness in his pants seemingly growing even stiffer. It encourages Jeno to try tugging on Jaemin’s lip with his teeth, and Jaemin moans into his mouth, which has Jeno’s cock throbbing. 

“Nana,” Jeno mumbles against Jaemin’s mouth. “P-Please touch me.” 

Jaemin immediately lifts his hips slightly before sliding his hand between their bodies and slipping it into Jeno’s pants. “Nono,” he breathes as his hand curls around Jeno’s cock. “It’s really, it’s – your cock is so big.” 

“Is...is that good?” Jeno asks tentatively, whining softly as he tries to thrust his hips up and pull Jaemin’s hips down at the same time. 

“Yeah,” Jaemin says, his grip on Jeno’s cock tightening as he starts stroking it. “Yeah, baby, it’s really, really good. It means you’re, you’re going to fill me so, fuck, s-so well.” 

Just moments ago, Jeno had believed that there could be nothing better than the feeling of Jaemin grinding against his clothed cock – but now he knows even that pales in comparison to how it feels to have Jaemin touching it directly, his hand moving back and forth along Jeno’s shaft. Jeno writhes under Jaemin, tears filling his eyes as he feels the same tightening sensation in his gut that he experienced before his first orgasm. “Nana, please, please, I want – I n-need –” he babbles, cutting himself off with a loud moan as his cum splatters all over his shirt and Jaemin’s hand. Vaguely, he notices that Jaemin seems to be shuddering in his hold too. 

“Good boy,” Jaemin coos, kissing Jeno messily before pulling away, his eyes dark. 

Jeno watches in fascination as Jaemin brings his dirty hand up to his mouth and licks some of the cum off his fingers. “You can lick it?” he asks curiously. 

“Some people like to,” Jaemin says, and it seems like the blush on his face is going to be a permanent fixture throughout Jeno’s rut. Not that Jeno is complaining – he thinks Jaemin is stunning like this, and his cock seems to like the view very much too, if the way it’s starting to swell again is any indication. “If they find it sexy, or their partner does. Or both.” 

Jeno thinks he can understand that – Jaemin definitely looks sinfully attractive with traces of Jeno’s cum on his lips. He wonders if Jaemin would like it if he tasted the cum too. “Can I try?” he asks. 

Jaemin makes a quiet noise in the back of his throat. “Sure, pup,” he says. “If you want to.” Jeno opens his mouth expectantly, assuming that Jaemin will just hold out his hand for Jeno to lick. But for some reason, Jaemin pushes his hand into his own pants instead, and when he pulls it out again, it’s even messier than it was before. 

“Is...is that Nana’s cum?” Jeno asks, his eyes wide as a thought strikes him. “Does that mean you could give someone your babies too?” 

“Well, um, I do technically have the ability to put a baby in someone,” Jaemin says slowly. “Most people who have a cock do, but I, uh, I’m not really interested in that.” As he speaks, he brings his hand up to Jeno’s lips, and Jeno sticks out his tongue to taste the cum. It’s salty and also a little sweet – not the best thing Jeno has ever tasted, but definitely not the worst either, and he likes it enough that his cock hardens completely as he laps the rest of it up. In the meantime, Jaemin’s cheeks glow pink as he continues, his voice a little softer, “I-I would really rather have someone put a baby in me instead.” 

Jeno licks the last of the cum from his lips and beams up at Jaemin eagerly. “I can do it!” 

“That’s right, you can,” Jaemin says, kissing Jeno tenderly. “But before that, we have to prep my hole, because otherwise your cock might hurt me.” 

“Because my cock is big?” Jeno asks, remembering what Jaemin said earlier. “Is your hole too small for it to fit?” 

Jeno feels something in Jaemin’s pants twitch as he says it – he realizes that it must be Jaemin’s cock reacting to Jeno’s words. “I hope not, pup,” Jaemin says with a slight smile. “You can help me prep, if you want. Would you like that?” 

“Yes!” Jeno says, nodding enthusiastically. “I want to help.” 

“My sweet boy,” Jaemin says indulgently, pressing a few kisses to Jeno’s lips and jaw before climbing off Jeno’s lap so he can remove both his and Jeno’s pants. Jeno watches with interest as Jaemin’s gaze grows hungrier the longer he stares at Jeno’s newly-freed and fully erect cock. “Nono,” Jaemin says, his voice a little hoarse, “I...I really want to suck your cock. Will you let me?” 

It takes less than a second of consideration for Jeno to agree. He already knows how good it feels to have Jaemin rut against his cock and stroke it, so he can only imagine how mind-blowing Jaemin’s mouth will be. Just as Jaemin is about to move closer, though, Jeno remembers what Jaemin’s original plan was. “But what about your hole?” Jeno asks, concerned. “I don’t want my cock to hurt you.” 

Jaemin thinks for a moment before his eyes light up with an idea. “You can eat me out,” he says brightly. Jeno cocks his head, puzzled, and Jaemin clarifies, “You can use your mouth and tongue to make my hole loose and wet, sweetheart. That way you’ll be prepping me and I’ll be able to suck your cock at the same time.” 

“Okay!” Jeno says eagerly, his cock throbbing. He’s not quite sure what to expect, but since it involves putting his mouth on Jaemin and having Jaemin’s mouth on him in return, he’s sure that he’ll enjoy it. 

Within a few seconds, Jaemin repositions himself so that he’s straddling Jeno’s face instead of his hips, and Jeno stares in awe at the view before him. He can clearly see Jaemin’s cock, which is cute, pink, and somewhat smaller than his own – Jeno thinks he would love having it in his mouth too – and Jaemin’s hole, a puckered little ring of muscle that Jeno is immediately transfixed by as it flutters and twitches invitingly. He brings up his hands to pull Jaemin’s cheeks wider apart, brushing a thumb over the hole in fascination and relishing the soft moan Jaemin lets out. 

“Play with it as much as you want, pup,” Jaemin says breathlessly, his hand encircling the base of Jeno’s cock. Jeno whines at the sensation but doesn’t beg for more, allowing Jaemin to keep talking. “Be a good boy and fuck me with your tongue so I can take your cock after, okay?” 

And Jeno wants nothing more than to give Jaemin what he wants, so he doesn’t hold back any longer. He leans in and licks a broad stripe across Jaemin’s hole, tasting him for the first time, and it’s something he immediately knows he won’t be able to get enough of. Letting out a pleased little sound, he settles in and presses his tongue into Jaemin this time, just as Jaemin wraps his lips around Jeno’s cock. 

Jaemin’s mouth is like nothing Jeno has ever experienced – warm, wet, and tight – and Jeno moans against Jaemin’s hole, thrusting with his tongue and bucking his hips up simultaneously. He licks deep into Jaemin and whines as Jaemin takes Jeno all the way down his throat, sucking hard while his tongue traces the vein along Jeno’s shaft. It’s messy and sloppy and depraved, but Jeno doesn’t care about that, lost to the sheer bliss of having something tight around both his cock and his tongue. 

Just as Jeno is starting to think he would be happy to stay like this forever, his face buried between Jaemin’s cheeks and his tongue in Jaemin’s hole, Jaemin hums around his cock and does something with his tongue that makes Jeno see stars. He comes without warning, and enough cum fills Jaemin’s mouth that Jeno can feel it spilling out even as Jaemin tries to swallow it all. Spurred on by Jaemin grinding down on his face, Jeno does his best to make Jaemin come too. He licks insistently and pushes his tongue as deep as he can, over and over, until Jaemin suddenly shudders on top of him and his hole starts clenching as his cum spurts onto Jeno’s chest. 

Jeno is in a daze as Jaemin climbs off him on shaky arms and legs before turning around, pressing himself along Jeno’s side and kissing him languidly. Jeno moans into the kiss, tasting his own cum on Jaemin’s lips, and Jaemin gathers some of the cum on Jeno’s chest with his fingers, pressing them into Jeno’s mouth too. Jaemin’s cum tastes better than his own, Jeno thinks faintly, but regardless, it’s a dizzying combination that has Jeno’s cock swelling yet again. “Nana,” Jeno whimpers, trying to rut against Jaemin’s hip. “W-Wanna put my cock in your hole.” 

“You can,” Jaemin murmurs against his lips. “You need to drink some water first, but then you can, baby. You were so, so good, making me come with your tongue, and now you’ll do it again with your knot, won‘t you?” 

“I’ll make Nana come again,” Jeno agrees immediately, accepting the water that Jaemin hands to him and drinking it greedily. After the bottle is empty and he sets it aside, he pauses, confused by the rest of Jaemin’s question. “I have...a knot? I thought I was supposed to use my cock.” 

To Jeno’s surprise, Jaemin giggles and peppers a few kisses on his face. “You’re so precious, sweetheart,” he says affectionately. “All alpha puppy hybrids like you have a knot. Once you come, it’ll swell at the base of your cock to keep your cum inside so, um, so the chances of it taking are higher.” 

Jeno nods in understanding. “So I can make sure I put my pups inside you,” he says, and Jaemin kisses him again. 

“Exactly,” he says, climbing on top of Jeno and straddling him once more. Jeno’s cock slides between his cheeks, the head catching on the rim that Jeno was just licking moments ago, and Jeno whimpers needily at the sensation. “Okay, Nono,” Jaemin says breathlessly. “I’m going to ride you the first time. It’ll just be me doing everything so you can get used to how it feels. Then you can start going at your own pace once you’re more comfortable.” 

Somewhere in his mind, Jeno is grateful for how methodical and thoughtful Jaemin has been in introducing him to all of this. But the larger part of him is desperate to put his cock inside Jaemin as soon as possible, and Jaemin seems to sense that, because he laughs softly before carefully reaching down to line up Jeno’s cock with his hole and sinking down slowly. 

“T-Tight,” is all Jeno can say at first. It’s even better than Jaemin’s mouth, he thinks dizzily, and he desperately wants to buck his hips up so he’s surrounded by more of the tight heat, but he keeps them still because Jaemin said he was going to do all the work this time. “Nana – it feels so, so – I need –” 

“I know,” Jaemin pants, pausing when Jeno’s cock is fully sheathed. “F-Fuck, baby, your fat cock fills me so well. You – you’ll breed your Nana, won’t you, my sweet puppy?” 

“I’ll b-breed Nana,” Jeno agrees readily as Jaemin starts rocking his hips in a slow, steady rhythm. “Wanna fill Nana with my cum.” He whines as Jaemin lifts himself almost fully off Jeno’s cock, only to let out a choked moan when Jaemin slams himself back down. And the longer Jaemin repeats those same actions, the more Jeno thinks he must look like a mess with how much he’s drooling and sobbing. But he doesn’t care, really, because all he can focus on is how nothing has ever felt as right as Jaemin’s hole around him. 

“That’s right, sweetheart,” Jaemin coos as he bounces on Jeno’s cock. He brushes the tear off Jeno’s cheeks and leans down to kiss him sloppily. “Such a good pup, letting Nana use your cock. Just look at you, crying so prettily because it feels so good, hm? My sweet boy, you want to come, don’t you?” 

“Y-Yes,” Jeno sniffles, gazing up at Jaemin through watery eyes. “Nana, I need – p-please, wanna fill you, wanna be a good puppy – l-let me –” 

“Go ahead,” Jaemin whispers, increasing the speed of his ministrations. “Come for me, baby, stuff me full and plug me up with your knot.” 

Jeno has already been on the edge as it is, and now, with Jaemin’s encouragement, he lets himself go, spilling inside Jaemin with a choked sob, his body trembling from the force of his orgasm. He can feel something swelling where his and Jaemin’s bodies are still connected – his knot, he realizes – and Jaemin groans, his hole clenching hard around the knot as he draws it inside him. 

“Does...does it feel good?” Jeno asks, feeling a little nervous all of a sudden. “W-Was I good?” 

Jaemin smiles and leans in to kiss him thoroughly. “You were perfect, sweetheart,” he says warmly, and Jeno learns that he can start growing hard again even when his knot is buried inside Jaemin. “The best puppy. And your cock feels amazing.” Jaemin rolls them onto their sides then, pressing himself against Jeno’s chest, and Jeno takes the hint – he wraps his arms around Jaemin and pulls him closer. 

“Can we do it again?” Jeno asks, ready for another round already.  

“So eager,” Jaemin says, an amused smile on his lips as he strokes Jeno’s ears gently. “We will, baby, I promise. But we have to wait for your knot to go down first.” 

Jeno whines a little at the thought of waiting, but when Jaemin kisses him a moment later, he melts into it without complaint, content to lazily make out with Jaemin until his knot finally deflates. When it does, he slides out of Jaemin carefully, transfixed by the cum that dribbles out along with his cock. He pushes some of it back inside with his finger, watching it disappear into Jaemin’s loose, puffy hole. “I don’t want it to leak out,” he says, meeting Jaemin’s eyes imploringly. 

“You’re about to put even more in me, silly,” Jaemin says, pressing soft kisses to Jeno’s jawline. “So don’t worry about it leaking out, okay?” Jeno nods, still pouting a bit, and Jaemin kisses his protruding bottom lip with a giggle. “Come on, you can choose how you want to do it this time. I can be on top again, or you can put me on my back, or you can take me on all fours. Whatever you want.” 

“I want to see you on your back,” Jeno decides. “Can I?” He can already picture it – Jaemin’s pretty blushing face under him, his eyes glazed over with pleasure as Jeno thrusts into him – and he’s overcome with a need to make it a reality. 

“Of course you can,” Jaemin says indulgently, rolling onto his back and spreading his legs invitingly. Jeno’s heart leaps at the sight – Jaemin’s cock is half-hard where it lies on his stomach and his hole is fluttering and wet with Jeno’s cum. Jeno is momentarily tempted to push inside right away, but then an idea strikes him. 

“Nana, can...can I take off our shirts?” Jeno asks tentatively. “I-I want to see how my cum fills your tummy.” 

Jaemin’s cock visibly twitches as Jeno says it. “Y-Yeah,” Jaemin says, clearing his throat as his cheeks turn pink. “Go ahead, pup.” 

Jeno eagerly strips them both bare, and his breath catches as he drinks in the sight of Jaemin in all his naked glory – his cock erect, his thighs parted, his nipples peaked – spread out on the sheets before him. “Pretty Nana,” Jeno says in a hushed tone. Suddenly nervous, he swallows and shyly adds, “My pretty Nana.” 

A brilliant smile blooms on Jaemin’s face. “Yours,” he says immediately. “All yours, baby. Always.” 

“My Nana,” Jeno repeats, and he’s so happy about it that he can’t help how fiercely he’s wagging his tail. “Wanna suck your nipples,” he blurts out a moment later. It isn’t what he meant to say, but it is true – and Jaemin giggles and leans up to peck Jeno’s lips, so Jeno doesn’t feel as embarrassed about it. 

“Well, they’re right here for you,” Jaemin says, arching his back slightly so the bulkiness of his chest is even more pronounced than usual. “Enjoy, pup.” 

Pleased to have been given free reign, Jeno provides his aching cock with relief first. He presses the tip against Jaemin’s hole and pushes in, amazed by how easily the puckered rim accepts Jeno’s girth. Jaemin moans as Jeno bottoms out, and Jeno pauses, unable to tear his eyes away from the little bulge that appears in Jaemin’s stomach – it’s formed by his cock, he realizes dazedly, and he thrusts experimentally just to see it move inside Jaemin. 

He remembers what else he wanted a moment later, and he leans down to latch onto Jaemin’s left nipple, sucking on it happily while Jaemin pants and writhes under him. It’s hard for Jeno to focus, because on one hand, being inside Jaemin somehow feels even better this time as he thrusts into him at a steady pace, and on the other, having Jaemin’s nipple in his mouth is making his mind go a bit fuzzy. 

He switches to Jaemin’s other nipple as he feels himself drawing closer to another orgasm, sighing in contentment as he sucks greedily. For a moment, he imagines what it would be like if Jaemin were already carrying his pups and he could draw milk if he sucked hard enough. “Mm,” he hums weakly, a little dizzy from the thought of it, and his hips stutter as he comes, filling Jaemin again. 

“N-Nono,” Jaemin gasps as Jeno continues sucking, threading his fingers through Jeno’s hair and tugging lightly. “Nono, f-fuck, ngh, gonna come –” Right as he says it, he trembles under Jeno and his cum spurts onto Jeno’s chest and his own. 

Jeno finally pulls away from Jaemin’s nipple so he can see Jaemin’s whole body again. He isn’t disappointed – with his glassy eyes and flushed cheeks and tummy slightly swollen with cum, Jaemin is an absolute vision. “Nana,” Jeno whispers, brushing a hand over Jaemin’s stomach in awe. “It...it’s like I already gave you my pups.” Jaemin laughs softly, and Jeno kisses him before leaning down to lick a few drops of Jaemin’s cum off his chest and meeting Jaemin’s eyes afterwards with a bashful smile. 

“You’re so cute, Nono,” Jaemin says, sounding a little tired but still fond. “How can you be so cute when you’re licking my cum off your lips?” 

Jeno doesn’t have an answer, but he blushes slightly as he laughs. “It’s just like how you look so pretty when your tummy is full of my cum,” he says, and Jaemin beams at him before tugging him in for another kiss. 

As they wait for Jeno’s knot to go down, they both drink water and eat a couple of the protein bars before losing themselves in another round of kissing – they get so into it that by the time his knot deflates, Jeno immediately starts getting hard again. He decides that he wants to see Jaemin on all fours next, and Jaemin obediently gets into position without hesitation. The image of Jaemin on his hands and knees triggers something primal in Jeno, and he starts pounding into Jaemin with abandon right away. It takes him even less time to come than it did when Jaemin was riding him, because now Jaemin is gasping and moaning and writhing in his hold so alluringly that Jeno finds himself knotting Jaemin much sooner than he expected. Jaemin doesn’t come, but he’s clearly spent, because he collapses face first onto the pillow with his ass still in the air as his arms give out. 

The next round is fairly similar to the previous one – the only thing Jeno does differently is keep Jaemin’s head pressed down so he can’t move as much. Jeno knows he likes it, though, because he comes before Jeno for the first time, and his sobs are mixed with pleasured moans as Jeno shoves his knot inside him once more. He gathers Jaemin in his arms afterwards and shifts their positions so that Jaemin is sitting on his lap, his back pressed against Jeno’s chest. They split another bottle of water, and then Jeno moves them again so that they’re lying down and he’s spooning Jaemin. He holds Jaemin close, nuzzling into his neck with a possessive hand splayed across Jaemin’s stomach as his knot goes down and his cock slips out of Jaemin’s dripping hole. 

Jaemin turns his head to kiss Jeno’s lips sweetly before drawing back with a smile. “Baby, listen to me,” he says, and he sounds exhausted but sure of himself. “I’m probably going to fall asleep soon, but you’re still in rut, and you’re going to need to keep knotting me. So you have permission to do whatever you need to while I’m sleeping, okay? You can use my hole or my mouth or any part of me however you want, even though I’m not awake.” 

Jeno blinks. “It won’t hurt you?” he asks, just to be sure. He hopes it won’t, because his cock is already stiffening at the idea of sinking into Jaemin’s pliant body again. 

“Not at all,” Jaemin says, kissing Jeno once more. Pink blooms on his cheeks as he admits, “I actually, um, I would love to wake up with your cum leaking out of me o-or your fat cock fucking me open.” 

“You want to wake up to me f-fucking my pups into you,” Jeno clarifies. The vulgar word feels unfamiliar on his lips, but the prospect of it has his tail wagging in excitement. 

“Yeah,” Jaemin says, biting his lip like he’s trying to hold in a moan. “I – I hope I’ll be stuffed full of your pups by the time I wake up.” 

“I’ll be really good,” Jeno promises. “I can stuff you full of my pups like a good mate.” 

Jaemin smiles. “The best mate,” he says, his words slurring slightly as his eyes start to flutter shut. “My sweet boy, filling me up with his cum. I know you won’t waste a single drop.” 

Jeno wants to prove Jaemin right, doesn’t want to waste anything – but as he watches Jaemin drift off, he’s also still a little worried about hurting him. So as much as his cock would love for him to fuck into Jaemin immediately, Jeno holds back and decides to use his hand first. It’s significantly less satisfying than Jaemin’s hole or mouth – it isn’t even as good as Jaemin’s hand, really – but he manages to clumsily jerk himself off until he comes, releasing all over Jaemin’s bare ass. Keeping Jaemin’s words in mind, he gathers as much of it as he can with his fingers before pressing them inside Jaemin’s hole. There are still some traces left when he pulls them out again, so he decorates Jaemin’s lips with the rest of it. 

As he starts working his cock again a short while later, it quickly becomes clear that his hand isn’t going to be enough anymore. Swallowing hard, he hesitantly moves closer to Jaemin until his chest is flush against Jaemin’s back and his cock is nestled between Jaemin’s thighs. “It’s okay,” he reminds himself as he starts rutting slowly, whimpering at the friction between his cock and Jaemin’s skin. “I’m allowed, Nana said I-I can use him however I want.” His movements become increasingly less refined as he draws closer to another orgasm, and he manages to press the tip of his cock against Jaemin’s hole right as he comes. He holds it there as steadily as he can while his cock pulses, coating Jaemin’s rim with cum and trying to belatedly push inside to paint his walls with it too. 

It sates Jeno more than his hand did, but he finds that he still needs more. Jaemin said he could use his mouth too, and Jeno is intrigued – it seems like it could choke him, but, Jeno reasons, he wouldn’t have mentioned it if he didn’t want it. So Jeno positions himself in front of Jaemin’s face this time and moans as he rubs his cock against Jaemin’s lips before carefully easing it into his mouth. Jaemin doesn’t stir even slightly, so Jeno begins rocking his hips, keeping his thrusts shallow and gentle – but even with his cautious approach, the familiar wet warmth brings Jeno to the edge quickly. He’s scared to fill Jaemin’s mouth with cum, though, so he pulls out in time to come all over Jaemin’s face instead before leaning back to admire his handiwork. 

The cum on Jaemin’s lips isn’t a waste, he decides, because Jaemin will probably like to taste it later – but the rest is, even though Jaemin looks very pretty with his cheeks and eyelashes dripping with cum. So he laps it all up and moves down to Jaemin’s hole, where he presses his tongue inside to add it to all the other loads he’s already left there. He spends a little longer eating Jaemin out, licking and kissing and sucking on his hole while fondling Jaemin’s cock a bit too. Eventually, though, the throbbing between his legs grows too painful to bear any longer, and Jeno finally accepts that the only way he’s going to get true relief is by fucking and knotting Jaemin properly. 

He slides his cock into Jaemin with care, doing his best to not disturb Jaemin’s sleep. Jaemin’s hole is just as tight and warm as it was during their previous rounds, and it’s easy for Jeno to lose himself in the feeling of it, wrapping his arms around Jaemin and pressing as close to him as possible as he thrusts into him with urgency. “Nana,” he pants, littering tiny bites and kisses on Jaemin’s shoulder and neck. “Nana, s-so tight, gonna – gonna fill you with my cum and give you my puppies.” 

His knot swells a moment later as he spills inside Jaemin, and he bites down on Jaemin’s shoulder, sucking a mark there reverently. When Jaemin wakes up, he thinks, he’ll ask Jaemin if he wants Jeno’s mating bite – he hopes the answer is yes, because his heart is already leaping at the thought of Jaemin proudly showing off Jeno’s claim on him. “You’re my Nana,” he murmurs against Jaemin’s skin. “And I’m your Nono.” 

The next two rounds find Jeno much less frantic as he bucks his hips lazily into Jaemin’s heat. Jaemin is hard too, even though he’s asleep, Jeno discovers, and he strokes Jaemin’s cock in time with his own thrusts until he feels Jaemin’s cum splatter onto the sheets. He brings some of it up to his mouth, savoring the taste – it must be growing on him, because he likes it even more this time. 

Jaemin starts stirring shortly afterwards, just as Jeno is ready to knot him once again, moaning softly as his eyelids flutter. Jeno presses a delighted kiss to his lips, and even in his drowsy state, Jaemin returns it. “Hi, baby,” he says softly, his eyes meeting Jeno’s. He still looks a little sleepy, but he licks the traces of cum from his lips and clenches around Jeno’s knot as he continues, “Seems like someone has been enjoying himself, hm?” 

“I didn’t waste any cum,” Jeno says proudly. “I was good for Nana.” 

“Of course you were,” Jaemin says, kissing Jeno’s nose. “My sweet puppy is always good for me.” He smiles coyly as he adds, “Are you going to breed me again now that I’m awake?” 

The answer is emphatically yes, of course, and Jeno demonstrates just how much he means it by knotting Jaemin five more times, eating him out and sucking him off once, and fucking his mouth twice. Jeno likes it best when he can see Jaemin’s face, with Jaemin either on his back or riding Jeno, but Jaemin seems to enjoy being on all fours a lot, so Jeno makes sure to vary their positions as much as he can. 

He’s lost track of how much time has passed and how many orgasms he’s had by the time he starts to feel a bit wiped out after going nonstop for so long, with only the occasional break to eat and drink a little. “Tired,” he mumbles, his head tucked into Jaemin’s neck and his cock still inside Jaemin. “‘M sleepy, Nana.” 

“You can sleep, baby,” Jaemin says, stroking his hair soothingly. “You must be so exhausted. You were so good, knotting me so many times. Now you should rest for a while.” 

“Nana can stay on my cock,” Jeno slurs as his eyes drift shut. “Y’can keep using it.” 

He must have fallen asleep immediately after saying it, because the last time he was aware of his surroundings, they were lying on their sides, but now Jaemin is on top of him, his hands on Jeno’s chest, his head thrown back, and his pink cock bouncing as he fucks himself on Jeno’s cock steadily. Jeno notes that his own cock is clearly hard, but he doesn’t feel the incessant need to come like he did before – he assumes it means that his rut is coming to an end. 

“S-So big,” Jaemin sighs as he speeds up his movements. “Such a fat cock, fills me, ngh, fills me perfectly. Like, mm, like it was made just for me.” 

“It was,” Jeno says, his voice a little hoarse. “Was made for my mate.” 

Jaemin meets his eyes then, his expression both awed and slightly nervous. “You really want me as your mate, baby?” 

“Yes!” Jeno says earnestly, before ducking his head bashfully. “I actually wanted to ask you before if – if you want my mating bite.” 

“Yes,” Jaemin blurts out, breaking into a wide smile. “Of course I do, sweetheart! I-I would love to be your mate.” 

Jeno’s heart feels like it could burst out of his chest. “Can I give it to you now?” he asks hopefully, and Jaemin wordlessly rolls them onto their sides and leans close, baring his neck to Jeno. 

“Please,” he whispers, and Jeno would never deny him anything, but definitely not this. He was never taught where the bite goes on a human, but he must subconsciously have an instinct for it, because he finds a spot that feels right somehow and sinks his teeth into it. The moment he does, his knot swells, and he spills yet another load inside Jaemin, who moans contentedly as Jeno licks soothingly over the mark afterwards. 

Jeno is filled with pride when he leans back and sees the physical proof that they belong to each other now. “My pretty mate,” he says happily. “All mine.” 

Jaemin smiles and nods, looking entirely blissed out and satisfied. “All yours.” 

They kiss languidly for a while, and when Jeno’s knot finally goes down, he’s relieved to find that at last, he’s completely sated. It’s only then that Jeno fully registers the state of the bed and their bodies. The sheets are entirely drenched in cum and sweat, and both of them are covered in it too. Cum is gushing out of Jaemin’s puffy, sore hole as well, and whatever isn’t leaking out is still inside Jaemin’s swollen tummy. 

Upon taking it all in, Jeno suddenly feels like he needs to clean Jaemin up and make him comfortable immediately, like he needs to provide something substantial for Jaemin to eat right away – but when he tries to get up, Jaemin tugs him back and doesn’t let him leave. “You don’t need to do anything now, baby,” he says, cupping Jeno’s cheek tenderly. “You’re instinctively trying to take care of your mate, but I promise you that the only thing I want right now is to lie here with you. We can deal with everything else after.” 

“Okay,” Jeno says, snuggling closer to Jaemin now that he’s placated by Jaemin’s reassurance. “Nana, a-are my pups really in there?” he asks a short while later, his eyes fixed on their hands lying one on top of the other on Jaemin’s stomach. 

“It’s possible,” Jaemin says after a moment of consideration. “The fact that I have an alpha hybrid’s mating bite now makes it possible for me to carry children. But it’s pretty rare for male humans to get pregnant on the first try.” 

“Oh,” Jeno says, and although he does feel a fleeting stab of disappointment, he supposes it’s a good thing, because in all honesty, they aren’t really ready to raise a litter of pups right now. 

“Don’t worry,” Jaemin says with a smile. “You’ll still be the best puppy, even if you didn’t manage to give me your pups this time.” 

That appeases Jeno, and they lie in comfortable silence for a while, Jeno feeling safe and content with his arms wrapped tightly around Jaemin and his head on Jaemin’s broad chest. There’s something lingering in his mind, though, and he finally decides to break the silence. “Nana?” he asks, suddenly feeling a little shy as soon as he speaks. 

Jaemin must detect the uncertainty in his tone, because he looks at Jeno curiously as he asks, “What’s wrong, baby?” 

“We...we’re going to do this again, right?” Jeno asks carefully. “For my next rut? And I can try again?” 

“Sweetheart,” Jaemin says fondly, a smile blossoming on his face. “We’re going to do this for all of your ruts from now on.” He leans closer, his voice dropping to a purr, “And you can even try when you’re not in rut, if you want.” 

Jeno’s tail wags eagerly as his heart rate picks up. “I can breed you whenever I want?” he asks, already excited for it. 

“As long as I’m in the mood for it too,” Jaemin confirms with a soft laugh, scratching Jeno’s ears affectionately. “And I’m pretty sure I usually will be.” 

Jeno beams at him, feeling warm all over. “Thank you, Nana,” he says happily, kissing Jaemin enthusiastically. “I love you!” It’s the first time he’s said it, and he doesn’t think he’s ever seen Jaemin’s smile look quite so radiant before. 

“You never have to thank me, Nono,” Jaemin says tenderly. “Not for this. Because I want it just as much as you do.” He presses sweet kisses to Jeno’s neck and cheeks and lips, and his tone is nothing short of adoring as he finishes his thought boldly, confidently, like he wants the whole world to know. “Because I love you too.” 

Notes:

Hi everyone! Puppy Jeno fic is finally complete!! I think this may actually be the filthiest thing I've ever written (and I wrote 5Jenos!!) but I hope that it's enjoyable! I tried to keep it as non-repetitive as possible but there's only so many ways to describe nsfw acts ksfkjdshf so hopefully it doesn't get boring or tedious!

Just a disclaimer that like in my Royalty A/B/O series, in this universe, a rut is entirely physical -- ie, Jeno's judgement isn't clouded or anything, it's sort of just like he's Mega Horny and wants relief. So everything is entirely consensual for both parties!

Title is a lyric from ANL by NCT Dream, which I feel is fitting because nomin did go at it all night long in this (and all day long too)!!

If you liked this fic, please consider interacting with the promo tweet to spread it to more people! Thank you so much for reading, and feedback and comments are always welcome and appreciated! I hope you all enjoyed! :)

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