Chapter Text
It has been three years since they’ve been together, and Sehun’s starting to think his professor of a boyfriend is an idiot.
(Lovingly, of course.)
“Hey, Kai, I’m going shopping. Do you want to come with me?” He scoops his keys from the dish on their entry table, side-eying his boyfriend who had a laptop perched on his lap in their living room’s loveseat.
Ask me where I’m going, ask me, Sehun stares at Kai, jangling his keys loudly to catch his attention.
It works- his alpha looks up, glasses reflecting a document on his screen, “Where are you going?”
“Out.”
“But where?”
Sehun smiles. “A baby shop.”
His grin is met with a frown.
“A baby shop? Is anyone we know pregnant?”
Someone you know is wanting to be, Sehun stops himself from saying the words on the tip of his tongue- instead swallowing them down, like lemon chasing tequila, “No. But I like to window shop for baby clothes. Aren’t they cute?”
“Yeah, I guess. Have fun, babe.” Kai says with no real enthusiasm, turning his head back down to his laptop.
Sehun’s eye twitches.
Just as he’s about to leave, Kai calls after him, “Oh, and if you’re out, mind picking up some milk on your way back?”
He can’t help but let the door slam behind him.
Here’s the thing: Sehun is bad with confrontation. Any sort of face-to-face, heart-to-heart discussion— he’s going to avoid it, no matter what. Kai is the same, apparently.
The only way Sehun was able to know Kai liked him was through Kai’s best friend! And wanting a baby? That’s one hell of a talk he doesn’t know how to start. He runs scenarios in his head:
“Hey Kai, do you wanna be a dad?”
Or, “You know you like babies. You know you like me. Why not have both?”
They sound stupid. They are stupid. Is there even an eloquent way of expressing the desire for a child? Perhaps Sehun can draw hints, like a serial killer leaving clues at the scene of a crime— though Sehun’s never even seen Kai victoriously finish a puzzle.
Regardless, how low could his chances of success be?
They’re lower than he could have ever imagined.
A week later after Sehun had gone window shopping (and bought a couple onesies), they found themselves at his holy grail: the grocery store.
Kai makes good money as a professor. Sehun, as his assistant, does not. And as Sehun hates the fancy whole-healthy food markets Kai frequents— in his eyes they’re all exorbitant and that the people who shop there are haughty, conceited dietician-wannabes. The couple has drawn a consensus, meeting in the middle.
Sehun loves the versatility of being able to pick up his birth control, buy a television, and buy a bunch of bananas all under one roof. It’s an allegory of humanity’s progress in his eyes.
“I don’t see the appeal,” Kai says as they browse the cereal aisle, “It’s all too convoluted for me.”
Sehun clicks his tongue, tailing Kai with the cart, “Ah, just for you. Think about it! You need to pick up groceries and some extra baby clothes. Where else could you go?”
He puts a package of granola in their cart, right next to sugar loaded berry cereal. His boyfriend turns to him, a ring of fluorescent store light haloing his shiny brown hair.
“Okay, well, you could always order clothes online. Besides, whose baby are you talking about?”
Ours, hypothetically. Sehun bumps the trolly against Kai’s hip, his voice flat, “It’s an analogy about convenience, asshole.”
He rolls his eyes, hoping he doesn’t sound too dismayed. As confirmation that he doesn’t, Kai laughs.
Ugh.
Flowers begin to blossom, and spring break draws to an end. Both Kai and Sehun find themselves back in University, Kai resuming chemistry lectures and labs, while Sehun buries himself in grading homework and planning tests.
Oftentimes Sehun gets so busy doing Kai’s work for him that he forgets to eat. Luckily Kai’s got the time to bring him food, occasionally- unless he forgets as well. Because of this, Sehun’s started taking a load of health supplements in order to fulfill his body’s needs. He has also tried to convince Kai to take them as well, but is met with resistance–
“I go to the gym, I don’t need pills!” Kai eyes the bottles on their kitchen counter, wary of all their different sizes and different colors. Sehun’s refilling his pill case for the week, it’s easier than opening fifty different bottles each morning before being late for work.
Sehun twists a fish oil container shut, “I work out too, idiot. But lifting weights doesn't give you the omega-3s you need, do they?”
“I’ve already got the omega I need.” His boyfriend grins toothily, comically winking at him.
Sehun deadpans and purses his lips.
“Besides, why would I need to take-” Kai leans in and squints, reading the label of a bottle near the edge of the table, “ - Acl? Acetyl l-carnitine? Isn’t that for people who wanna get pregnant?”
Huh, I wonder who that could be. Sehun narrows his eyes at his boyfriend, hoping the silence gets the message across, I want to get pregnant! I do!
Kai just blinks at him.
“It’s a great antioxidant.” Sehun answers curtly, turning his head back down to his pill case to finish counting.
“Aha! I know!” The infliction in his boyfriend’s voice makes Sehun swivel his head back up, hoping a lightbulb has been lit above Kai's head.
The alpha nods, the gears in his head churning, “It also helps with cholesterol, right? D’you think I should take it too?”
And the lightbulb promptly burns out. Sehun sighs, his shoulders drooping, “If you want to.”
He’s dying. Like, literally dying.
It’s been a really exhausting day full of labs, and Kai’s having to drag his feet to his front door. He smells like copper sulfate, his hair’s messy, and his sweat is forming a cast over his body, making it feel as if his clothes were stuck to his skin.
Sehun told him not to wear a suit, especially not the gray one- his favorite suit, at that.
“It’ll smell.” Is what Sehun warned. Kai faintly recalls arguing, “But a lab coat and apron will save it!”
He imagines the smirk on Sehun’s face when Kai’ll tell him he was right. As he pushes the house key into the lock, the door suddenly whips open to Sehun, who’s looking as disgruntled as a cat woken up from a nap. His hair sticking up in four different directions, his shirt and jeans wrinkled and ruffled, and Kai’s exhaustion dissipates into a sort of fondness; something amongst the lines of aww, how cute.
“Hi baby,” He coos, “How was your day?”
Sehun grumbles, an unfamiliar glimmer in his eyes burning holes through the alpha. Whatever cutesy feeling Kai was feeling is replaced with a hot, churning sensation in his chest when Sehun reaches out and yanks him inside, immediately covering Kai’s mouth with his own.
He kisses Kai like he hasn’t seen him in years, fervently pushing the older man against the back of the door, pretty much manhandling him. A warm, powdered-milk like scent bombarding his nose.
Kai groans, “Fuck,” And grabs Sehun’s waist, pulling his boyfriend closer, slipping his tongue past Sehun’s lips. When was the last time Sehun greeted him like this?
One thing leads to another, Kai’s belongings long forgotten by the door.
Kai pauses for a moment as he trails his palm over the grooves of Sehun’s spine, hiking his shirt up in the process, watching his boyfriend wither beneath him.
“You– you’re nesting.” He observes, his knees digging into the soft plush of mismatched sheets and pillows, his suit pants chafing against the back of Sehun’s jeans. The omega has one hand on the bed, holding himself up, and another hand working on unbuttoning and unzipping his pants.
Sehun exhales, “Thank you for noticing, dear boyfriend. Mind helping me out here then?”
He arches his back a little further, pressing his ass into Kai’s crotch. The warmth of Sehun’s heat practically melting through his clothes.
Kai’s hands reach under Sehun and he yanks his jeans down mid-thigh in one swift motion, catching Sehun by surprise and causing him to balance himself using both his hands. The off-guard moan the omega lets out flusters Kai– not as much as his underwear does, which is lacey and colored a pretty blush pink, embedded with hearts.
Placing his two hands on Sehun’s hip bones, he ruts his hips forwards, grinding his crotch against Sehun’s ass, savoring the low groan that comes from Sehun’s lips.
“Kai, please,” He huffs, his head down and pressed against the wall of pillows in front of the bed’s headboard, his knuckles turning yellow from fisting the sheets. Heat pools in his abdomen amid the friction, and Kai feels his dick stiffening from the contact- and he groans– he wants more, so much more.
“Please what, baby?” Kai’s thumbs rub circles over Sehun’s hips, “What do you want?”
Sehun’s answer comes in the form of him turning around on his back so Kai can see his flushed face. But instead of the wanton expression Kai is familiar with, Sehun’s got his eyebrows furrowed and his lips stitched in a tight line. Though his arms are on his side, Kai can imagine them crossed over his chest.
He’s holding himself up on his elbows, his silk shirt drawing tight against his chest, his nipples indenting the fabric. The irritation clear on Sehun’s face is not doing much to quell Kai’s horniess, unfortunately. Is it weird for Kai to admit it’s making him hornier?
“What?” He asks again innocently, running his hands along Sehun’s side in an attempt to soothe his boyfriend.
“‘What do you want?’” Sehun echoes, face aghast and voice shrill. It seems that Kai’s attempts are met with dismay, so his hands freeze by Sehun’s waist.
Kai smiles nervously. “Yeah, babe. I’m tryna be sexy.”
If Sehun were in heat, Kai would probably be balls-deep in him by now.
Instead Sehun tilts his head and rolls his eyes before pinning him with an austere, dumbfounded look- “We’re mated. I’m nesting. Kim Kai, what do you think I want?”
The alpha stares at his boyfriend, scraping the corners of his mind of an answer that would satiate his omega and his own dick. Kai opens his mouth to reply but Sehun doesn’t let him utter a single word- leaning up from his nest, Sehun instead takes the alpha by surprise and tugs Kai towards him by his tie.
“I want a baby, you dumb fucking alpha. I want your baby.” He hisses as if it should be obvious.
And god, it should have been. All the mentioning of babies, the shopping, the probiotics; it’s all glaring gold in Kai’s mind now. His eyes widen, and he’s suddenly all too aware of the scent- his scent- mandarin and jasmine permeating throughout the bedroom. His dick twitches at the prospect of baby making, and Sehun seems to feel it too- his exasperated facade is broken by a small smile.
There’s a thousand things Kai wants to say but the only thing he can compute is mixed between a weak whimper and a groan:
“Hng- Oh my god, of course.”
Sehun pushes his head back into his nest, now only in his underwear as Kai works his way up his body, mouthing against his skin, licking a stripe from his belly button to his nipple, taking an erect nub in his mouth. Sehun’s breath hitches, his hips rising of their own accord, his nails pressing into Kai’s shirt.
It’s no longer mid-day, and the night shines through the open window beside the bed– the two of them are too busy with each other to pay any mind to it.
Even though Sehun isn’t in heat, he’s in distress, groaning, “C’mon asshole, do something.”
Kai’s mouth catches on his nipple, sucking as if there’s any chance of milk while he simultaneously tugs Sehun’s panties off, groping his ass in the process. Leaning back, he throws Sehun’s underwear behind him, dragging his eyes all over Sehun like a panther on the prowl.
Satisfaction brews deep within him as his gaze latches on the patches of red blooming on his boyfriend- his mate’s skin. This time it’s his turn to answer Sehun, and before he can open his mouth to dispute the lack of touch, Kai presses his palm against Sehun’s balls, dragging his touch to his pre-cum leaking cock.
His hand is only there for a few seconds- but it causes the omega to buck into his touch, his back arching and thighs squirming as Kai pries them open even further.
Whatever Sehun was going to quip is replaced with a high-pitched whimper when Kai’s head dips back down and takes the omega’s dick in his mouth, his tongue sliding over the head, down to where it’s sensitive, with a free hand fondling his balls. When the alpha adds suction to the mix, Sehun throws his head back into his nest, a thigh on each side of Kai’s head and calves crossed over his back.
He can’t help but jerk into Kai’s mouth, chasing the caldity coiling like rope in his abdomen, his balls tightening. But right before he’s able to come, Kai pulls his head back, letting a small string of saliva connect Sehun’s dick to his mouth.
Kai doesn’t even give Sehun a moment to catch his breath before slipping two fingers past the omega’s slicked up rim. Sehun’s breath hitches, the heels of his feet pressing into the alpha’s back.
“”M gonna fill you up, babe,” Kai mouths against his thigh and trailing up his body, up to his neck, and Sehun feels the words against his skin more than he hears them. “You always take me in so well, god, you’re gonna look so good full with my baby.”
All the omega can do is exert Kai’s name through a breathy moan, his hole contracting around Kai’s fingers as they move in tandem, stretching him out, making him feel so full. His hands go from clawing at Kai’s back to his own body, pulling his asscheeks apart to give his boyfriend more leverage.
The alpha’s cock splurts out precum, pulsating on the prospect of being buried deep with Sehun’s tight hole, and Kai inclines his hips ever so slightly that his dick is flush against Sehun’s ass– the tip catching against his puckered hole.
“Please,” He begs again, eyes glossed-over and his pretty face a peachy-pink. He is completely and utterly undone, unraveling beneath Kai’s fingertips, and the sight surfaces a raging, feral desire within his abdomen, making him lean in toward Sehun.
Their chests slide together now, the bed beneath them soaking in the sweat, slick and Sehun’s desperation.
Kai kisses the tears brimming in the corner of his eyes away right as he pushes into Sehun, his cock and fingers expanding him, straining against the all encompassing heat of his hole.
All the muscles in Sehun’s body go slack as Kai bottoms out. His legs quiver with over-exertion as Kai folds him into two, shoving his cock in as deep as it can go, edging his prostate. Slipping his fingers out, he brings them up to the omega’s mouth, pressing them against his bottom lip, watching through low lids as Sehun sucks on them, his tongue swirling between his digits.
A rhythm falls between them with Kai bucking his hips in and out, in and out. His knot doesn’t take too long to form, and by then, Sehun’s found himself on top, feeling the drag of Kai’s cock inside of him with every rise and fall of his hips. His alpha holds him steady, his own head cushioned by the nest’s pillows.
Pleasure begins to crest within him, a deep coiling and curling heat, tightening and tightening until he lurches forward, seeing white behind his eyes and spilling come all over his abdomen.
Overcome with his orgasm, he presses his palms against Kai’s chest, clenching his hole and gasping as his alpha’s knot makes its way up his hole, swelling inside him.
Kai thrusts upwards as he chases his own release, rutting his hips into Sehun’s ass until a heat wave consumes him, swallows him whole- his knot bursting, come dripping from under his omega’s thighs.
It takes them a long while to catch their breaths. Kai can’t slip out of Sehun until his knot fully deflates so Sehun drapes his completely limp body over his alpha.
Sehun pants like he’s just ran a mile, and Kai wordlessly traces patterns down his omega’s back. “Are you on birth control?”
“Yeah. But I’ll get off of it.”
Kai mutters, “I can’t wait to get you pregnant.”
The omega blubbers nonsensically before lifting his head up, resting his chin on top of Kai’s chest.
“All my attempts, and what do I get? ‘Of course.’ Of course?! Do you know how hard I tried to get you the least bit interested in having a baby?! Kim Kai!” Sehun whines.
The alpha laughs, his voice rumbling within his chest, sweat glistening on his high cheekbones. He envelops Sehun into his arms, maneuvering them so they’re on their sides, face to face.
“I’m sorry, my love. Thank you for being patient with me.”
Flustered under the intensity of Kai’s gaze, Sehun blushes.
“Shut up, asshole.”
Well, apparently his chances of success have always been pretty high.
The school year is ending, and it’s a dash to the finish line. One more week of finals remain, though he doesn’t have to go on campus, he does have to grade final exams- that he can do from the luxury of his own house. Sehun just wants to get it over with so he can finally relish the tropical summer sun.
However, he’s been feeling under the weather lately. Sick with something unfamiliar to his body.
Unbeknownst to Kai, he wakes up in the morning, when the sky is still a sapphire blue, to throw up last night’s dinner in the toilet. And he’s been moody, too. He wrote some passive-aggressive notes in the margins on his student’s exams. (Which he’s covered with white-out because his reputation of being the nicest TA cannot and will not be tainted ) There’s also his weird cravings- like corn on ice cream and spam musubi with Italian pasta–
Food poisoning? No way.
Parasite? Ew, gross, and no.
Influenza? Nope.
“Oh my god, no— no way!” Sehun gasps, covering his mouth with his palm. The two little lines on the test are all he’s ever wanted- and now there're three little rectangles giving him the same sign: he’s pregnant.
When Kai comes home that night, Sehun forgoes the intricate puzzle he had planned in order to tell Kai he was going to be a dad. It’s probably because he saw Kai- his gorgeous boyfriend, all frazzled from a long day’s work, and he didn’t want to stress him out even more.
The words somehow just slip out of Sehun as he opens the door, “I’m pregnant!”
Kai’s keys clatter on the floor and his messenger bag slips off his shoulder as his eyes widens and his lips part– but he doesn’t utter a single thing.
Sehun’s smile falters and his hands fall limp by his sides. “Kai?”
His boyfriend steps forwards and takes him in his arms, burrowing his face in the crook of Sehun’s neck. The omega feels something wet- and with the shuddering breath Kai takes, he realizes that the alpha is crying.
“Oh, Kai,” He runs his hands over the older man’s back soothingly.
Even though Sehun’s just recently been struck by baby fever he can’t forget how early on in their relationship Kai expressed fondness over families, gushing about his nieces and nephews every chance he got.
Now he finally gets to have a baby of his own- so of course he’s going to be overwhelmed.
“I love you, Sehun.”
When Sehun shows Kai his secret stash of baby clothes, Kai’s mouth nearly meets the ground. He doesn’t know whether to be amused or exasperated- so how about a mix of both?
“How much did you buy?”
“Enough for the first six years of our baby’s life!” Sehun says all too happily.
Kai sighs and shakes his head but with a soft smile on his face.
When the school year starts, Sehun’s already entered his second trimester. His bump has yet to interrupt his routine, hardly noticeable under his sweater vests and collared shirts, but Kai is totally obsessed with it.
“How’s my little baby?” Kai coos, rubbing a hand over Sehun’s midsection. “Are you giving papa trouble?”
It’s six in the morning and Sehun grumbles and turns around, throwing his arm out over Kai, “No, but his dad is.”
“His?” Kai raises an eyebrow. “What if he’s not a ‘he’?”
Sehun’s eyes snap open and he turns his bleary sight towards his boyfriend.
“Well, we’d have a daughter. But you’d love our baby no matter what, right?”
The alpha looks scandalized, “I can’t believe you’d even ask that!”
Sehun groans, lifting himself so his back is propped up against the headboard, “Just making sure, professor.”
He bats his lashes and gives Kai a sultry, suggestive look. Well, I’m up early, Sehun thinks, biting his bottom lip. Might as well make the most of my time.
One of the alpha’s hands travels down to Sehun’s waistband, his fingers drumming against his skin.
“Professor, huh? I like the sound of that,” But before Kai could rile him up any further, a sharp pang in his abdomen tears a sharp gasp from his mouth.
Kai immediately sits up, alarmed, “What happened? Are you okay?”
There’s a fluttering feeling, and Sehun looks down at his belly, placing a hand where he felt the tap.
The doctor had said that around eighteen weeks he should feel the baby kick around. Lo and behold, “The baby kicked! Do you wanna feel?”
Nodding like an enthusiastic little boy, Kai lets Sehun guide his hand, stretching his fingers over the expanse of Sehun’s lower abdomen.
Kai wheezes when the baby moves again.
“Woah! That’s so cool!”
To think he’s a professor in his thirties.
Right after new years, in the midst of a lecture, Sehun feels a slight pop in his abdomen and takes no heed of it, continuing to talk about basic stoichiometry– until he hears one of his students exclaim, “Mr. Oh! I think your water broke!”
He looks past his belly and sees his sweatpants soaked, a clear fluid puddling around his feet. It then registers: he’s going into labor. He shuts his notes and smiles at his class.
“Oh. Okay then. Class dismissed!”
A couple of students jump out of their seats to help him, one of them asking if they should call his partner to pick him up. He waves his hand nonchalantly as he grabs his belongings, “No, it’s just Professor Kim. I’ll head to his office.”
“Breathe in and breathe out. That’s right, honey, you’re doing fine.” Sehun pats Kai’s hand as the alpha hyperventilates, “You can always wait outside.”
A sharp contraction careens him forward, and he squeezes Kai’s hand so hard his knuckles turn white.
“No! I need to be with you!” Kai winces as Sehun’s squeezes his hand again.
The omega’s chest heaves with heavy breaths, sweat glistening on his forehead, dampening tendrils of hair that Kai gingerly pushes away.
His voice is low and soft as he comforts Sehun, “We’re going to get through this together.”
Their daughter is born midday, and both of her parents are in awe when she is introduced to the world.
She is red and screaming, but once she is wiped down, Sehun reaches for her, cradling her in his arms. She stops wailing- instead she looks up at him with eyes identical to Kai’s hazel-green ones.
“Meet your daughter,” Sehun whispers, handing her off to Kai- who anxiously looks back and forth between his daughter and his mate.
Sehun reassures him, smiling, “C’mon, say hi.”
He takes her in his arms, extremely tentative, and promptly melts as she wraps her tiny, pruny hand around his pinky.
She knows he’s her dad, and god, does it kill him.
“What should we name her?”
“Yuri?” Comes a suggestion from Sehun.
She has yet to develop her features, being only a couple of hours old, but Kai can already see the best of him and the best of Sehun within her. A tender feeling swells deep within him, and he croons,
“Yuri-ah, you’re killing me.”