Work Text:
The thing about being the prime suspect of the investigation, chained to the lead detective of this investigation, was that when the said detective was out of commission for any reason, it made Light out of commission by extension. And ever since chaining himself to the detective, Light didn’t really have a heat, which meant so far it only happened this way and not the other.
When he first willingly gave himself over for imprisonment it was decided that it would be too much of a security risk to let anyone into his cell to help out with his heat. And after the hell his father has risen at the mere notion of letting him spend his heat - alone or with the heat assistance - in front of L and the task force on camera, it was decided to eliminate the heat factor altogether. Ultimately it was his father who decided to pump Light full of suppressants for the duration of the imprisonment.
Except his imprisonment lasted way longer than anybody anticipated. It was fairly common knowledge that the prolonged use of suppressants was remarkably dangerous, especially for younger omegas whose cycles hadn’t had the chance to firmly develop.
So it was either suppressants or an inevitable peep show of a teenage omega contorting on the concrete floor of the basement, with nothing to make a nest from or seek release. Light doubted L would even care, but the task force must have put enough pressure to finally release him.
Regardless, the imprisonment lasted longer than he anticipated, and the suppressants, as predicted, fucked up his cycle. It wasn’t something he was too worried about. Lack of heats wouldn't affect his plan, as far as he was concerned it was rather convenient. He just needed to pretend to be an innocent little omega with no memories of being Kira, which he has done flawlessly. He managed to convince every alpha in the task force rather easily.
Except for one. But that one wasn’t even around right now.
Unlike Light’s heats, L’s ruts came in with clockwork precision. Not that Light counted. Or would ever need to - he was sure he could smell L getting close to his rut days before anybody else noticed. On more than one occasion - to his eternal mortification - the gradual deepening of the rich creamy scent forced Light to cross his legs to stop the escaping slick.
Light sighed, breathing in more of the lingering scent. He was laying on the bed in their shared room, where he would be confined for the duration of L’s rut. Whenever Mogi or Aizawa or any other alpha from the task force went on their rut leave the work continued as it normally did, with the absent alpha catching up on whatever they missed earlier. When it was time for L’s rut, the investigation went more stale than usual. The task force would continue to monitor and record any and all Kira-related activities, but Light wasn’t allowed to stay back and investigate without L. Which probably was a good call, but it still managed to get on his nerves.
It was the only time L unchained himself from Light. But while L was out satisfying every and any need an uncivilized alpha like him might have, he was stuck in their room with no electronics and with nothing to occupy his mind.
He buried his nose in the sweet-smelling pillow, cursing out the alpha. With nothing to do it was impossible to ignore the faint smell still lingering on the sheets. It was adjacent to L’s usual coffee-like scent, but a few shades darker as it usually got around this time.
He smelled it earlier, waking up to L crawling out of bed in the morning. His forehead was sweaty and some of his unyielding hair was stuck to one side. He was unlocking the handcuff from his arm.
“S’time?” Light mumbled, still pretty much asleep.
“Yes,” L turned his wrist around for a moment. “I will be back in a few days. I trust you to not kill anyone in this building while I’m gone.”
Denying he was Kira each time L threw a remark his way got boring pretty early into his confinement. He rolled his eyes just for the sake of it. There were about a hundred cameras in their room alone, and a pair of heavily armed “associates” wandering around the building. L said they were there for the fieldwork part of the investigation, but Light knew they also kept an eye on him. “You don’t trust me.”
L’s dark eyes were a little reddish around the edges, Light noticed intrigued. “I trust you to do the smart thing and behave while I’m gone.”
Light’s guts made a little jump at the wording. He outstretched on the bed nonchalantly, hoping the detective wouldn’t notice in his ragged state. “I will be on my best behavior.”
It didn’t escape him how L’s eyes flickered over his body. Light wouldn't be able to keep his scent under control if he wasn’t used to being watched constantly by the detective. “We’ll see. Give me your hand?”
Observing the detective closely in kind, he lifted his hand lazily. It was fascinating seeing L like this. He looked rough and more tattered than his usual self. The bags under his eyes got impossibly darker. How was he supposed to get through his rut like that?
Slim fingers circled his hand lightly, centimeters away from the scent gland on his wrists. He unlocked his cuff way too quickly. It would take just one turn of his hand to rub his scent over the detective.
An inelegant whine formed in Light’s throat at the memory. With one touch he could be sending L away to get through his rut with Light’s scent all over him. Would he be smelling the lingering scent like Light is doing right now? Was Light’s own smell even alluring at all to the detective? Was he thinking of Light, rutting into his own hand?
He pushed himself up on his elbows, frustrated at the weak scent. It was only a few hours since L was gone, but the bed now mostly smelled like Light. He scanned around the room.
Surely enough - because his roommate was a slob - there, in the corner of the room laid a crumpled up white t-shirt.
He picked it up, acutely aware of the cameras monitoring his every move. After a brief consideration, he shrugged off his own shirt, deciding that hey - if L didn’t want him to steal his stuff, maybe he shouldn't be leaving him alone.
He pulled it on, immediately engulfed in that delicious dark-roast scent. But this time he could smell it to his little omega’s heart content.
He got back under the covers, gathering up the fabric of the collar and pressing his nose into it. Another embarrassing sound escaped his throat, as the scent of dark coffee and spice, and something unmistakably smelling like L filled his nose.
He might not have gone through a heat in a couple of months but that didn’t stop him from being fucking horny. He slipped his hand under the covers and under his boxers to rub a finger along his wet folds. If L can have a little fun, why can’t he?
Was the detective using toys? Or did he use the rut assistance? Did he have a list of pretty omegas in one of his private cell phones, ready to jump on his knot wherever he called? How hard would it be to learn their names, with Misa in the headquarters?
Light huffed, cursing out his stupidity. It’s not like anybody could enter the headquarters, least of all some random omega to assist the lead detective of the murder investigation. And even if there was, killing them after filling the room with the scent of a needy omega, still dressed in L’s shirt, would not put him in a great light. Overall stupid idea. He gave himself a pass on that one because thinking about L in a rut only ever led him to produce stupid ideas.
He kept caressing himself lazily, nosing along the collar, letting himself be swallowed by the rich scent.
He must have gone under pretty deep, barely noticing the door opening when it engulfed him with the light from the hall.
He startled, pulling his hand back. He squinted at the brightness, finding an outline of a familiar figure entering the doorway.
Light sniffed at the air, and oh the shirt had nothing on the scent wafting off its true owner.
The owner who looked like he was about to eat him.
He pulled himself up, kneeling on the bed before the detective. He smelled divine but looked absolutely rough, and not quite like himself.
“L?”
L’s inner alpha was an absolute asshole.
He would know seeing as he was the one stuck with the guy and, more often than not, at the brunt of the misfortune caused to him by the mindless beast.
Case in point; no matter what he did, his stupid alpha could not get off.
He pulled out of the whining omega underneath him, once his knot deflated, but he felt more frustrated than before.
He was hot and angry. He hated surrendering himself to this animalistic side of him. It was undignified and most importantly - a waste of time. Each time at least two days were taken out of his life, all to indulge a part of him that preferred thinking with his dick and not his brain.
Still, despite the FOMO crawling up his throat each time, he was only human. He couldn't deny that these few days of his cycle weren’t completely unenjoyable, especially in the right company. Most of the time he was able to call the rut services, sweat and fuck through the week and move on-
-just not this time.
He pulled at his hair in frustration, feeling his dick go back to hardness.
He had a feeling this one would be a bad one. That’s why when he called for the rut service he requested both of his usual picks. Both girls assisted him with his previous ruts.
It’s not that he wasn’t attracted to them. He picked them out himself. They were usually more than enough to guide him through the worst of it and leave both of them satisfied at the other end.
Except for this time. The room was starting to spin. With each orgasm he pumped into the girls, he felt more and more disconnected from his head.
The younger omega, a short-haired Takada, stepped in place of her friend and presented prettily before him. She wiggled her ass in a silent hurry-up gesture.
He was feeling numb as he entered her. He didn’t understand what was happening to him. His dick was wrapped in a nice, tight heat, but he almost felt like it belonged to someone else.
And they smelled fine. There was nothing wrong with their scent, it was just there. In all honesty, L could take it or leave it. It was not something he paid that much attention to before, but recently-
-recently, he began longing for something sweeter .
But of course, anything from “before” was thrown out of the window once he started to share his bed with his main suspect.
Main suspect, who was undoubtedly a serial killer, but also a beautiful, sweet-smelling omega that he couldn’t stop looking at. It was his job though, so it was fine. He needed to be watching him at all times, right? Even when he laid there, sprawled across L’s bed each morning, looking and sounding like a treat.
He pulled out mid-fuck. Ignoring the confused sounds coming from the girls he slipped into the bathroom.
If they couldn’t help him, he would have to do it himself. He squeezed his cock like he was reprimanding it. It was miserable, but technically an alpha could spend the rut with his own hand. He could at least try to take some of the edge off and then he could go back to work.
He stroked his cock, but eventually, the leftover slick rubbed off and his strokes started to feel painful. He stepped into the shower, turning on the water to help with friction.
As the sound of running water filled the room, he stopped hearing the girls rummaging outside. As he kept moving his hand up and down his dick, his mind started to supply him with images of a different omega, sweet and charming, and smelling like the most exquisite of treats.
Shit. There wasn’t enough blood flowing through his brain. The water worked as a shitty lubricant, making him let out pathetic mewls as he stroked his dick raw. He pushed his face into the tiled wall, keeping up a harsh pace, hurting all over.
When he opened his eyes, he was back on their shared floor.
Right in front of-
In front of their room.
The door was open - somebody opened it? - and he was staring inside the dim-lit room.
The figure on the bed shifted, catching his attention. When he stepped inside, he was met with a wall of thick sweet-smelling scent.
The alpha inside him growled in his chest.
“L?”
He was pulled closer by the voice like the dumbest of sailors are pulled toward the siren’s song.
Get out, the last sane thought sparked through his brain, that’s how the sailors die.
But by then L was close enough to notice the white shirt wrapped around Light’s frame, and the last sane thought left his brain without a goodbye.
“L, are you okay?”
He pushed Light back on the bed, withdrawing a gasp from his elegant throat. He wasted no time burying his face in that beautiful delicate neck, and god, Light was smelling like the most delicious pastry, like something too sweet to eat if you’re not L and used to living off sugar and-
-he smelled like omega.
L let out a growl, pinning Light down, opening his mouth to lick a stripe down his throat.
Light’s surprised gasp morphed into a whine, as L continued to suck on the delicate skin, breathing in more of that dizzying scent.
He pulled at the shirt - his shirt? - stretching it to expose Light’s beautiful collarbone. He dipped his head lower, to scent him down his chest.
“W-wait,” gasped Light, catching his head between his hands. “Did you finish your rut?”
A question. A question should be answered, and L knew the answer.
If only his muddled brain could focus, but no-
When Light brought his hands to his face, L was met with the most delicious smell.
“What are you- Oh!” he let out when L sucked his fingers into his mouth, tasting the syrupy slick. The flush on Light’s face took a dark fever-like shade.
From there, L might as well be a spectator in his own body. The asshole alpha escaped from his insides and took the wheel like the bastard he is.
Slim fingers caressed the inside of his mouth, and across his teeth, feeling the protruding canines.
He growled when Light withdrew his hand back. “You’re not. You are still in the rut, you have to- you have to get back to your room.”
“This is my room,” he managed to growl out, lowering himself further, catching a whiff of the source of the delicious smell.
Light pulled himself up the bed. “Then I will go. I will go okay? You’re out of your mind-”
L pulled him back by the legs. Light yelped, but recovered quickly, kicking him in the chest.
He snarled, partially irritated at the attack, and partially delighted to have such a playful omega. After all, part of every alpha’s nature was the chase.
He could stay put and watch his omega try to get away, but the tightness in his belly was starting to become too much, and every instinct in his body was telling him to fuck and breed. He could have some fun with the omega after he knotted him a few times.
In a burst of swift reflex, fueled only by desire, he grabbed the pair of handcuffs hanging on the bed frame and locked one of the cuffs on omega’s wrist.
His omega’s eyes went wide and he pulled at the cuff, trying to get it off his hand. L locked the other end on his own arm.
His omega dropped from the bed, but couldn't get far, not with the chain linking them.
He slipped from the bed to approach the fearful creature, but Light backed away, as far as the chain let him.
“You’re not yourself, L,“ sniffed the little omega. “Let’s just call Watari, he will know what to do-”
“No.” No alphas. He couldn’t let another alpha anywhere close to this sweet little thing.
He kept a tight hold on the chain, not allowing the omega to back away an inch further as he got closer. He got on his knees before him and lifted up his chin to see that gorgeous face.
It was wet with tears. “Please, L. It’s me,” breathed the little omega. “It’s Light.”
Yes. Of course he was. L wouldn't be here if he wasn't.
“Light,” whispered L, before surging forward to capture his soft, wet lips.
He smelled so sweet but tasted like salt. That just wouldn't do. L let go of the chain to gather him onto his lap. He brought his arms around his waist and stroked slowly at his sides. He moved lower to lick at his neck, allowing the omega to take little fearful gasps of air.
He purred into the column of Light’s throat. The vibrations spooked the omega at first, but when nothing more happened, his body started to lose some of its tight tension. L continued to purr unhurriedly, nipping and kissing at the exposed skin until he felt the omega’s breath steady. When he calmed down enough, L's hand began to wander lower.
He slipped his hand under Light’s underwear, petting the soft skin he found under there. His fingers brushed by the little pucker in the crevice of his cheeks but it was closed and dry. He would have to fix that later. The omega shuddered on his lap. He moved on from the tiny hole to investigate lower.
His hand slipped down until he found what he was looking for. And it was absolutely drenched .
“Baby,” He dragged his finger between the wet folds, pulling a sharp inhale out of the omega. “This little thing for me?”
Light dropped his head on L’s shoulder, folding around him nervously. L held him up, giving himself more access to Light’s crotch. He caressed him slowly, encouraging more slick to pour out of his opening.
After a few moments of stroking the omega’s back and pussy, L pushed in a single digit, dipping into his hole. Light’s muffled whine went straight to L’s aching dick.
He indulged Light for a few moments more, letting him hide his flushed face in L’s neck. L continued to pump his finger in and out of the wet hole until the tightness in his stomach felt like it was about to snap.
He pulled down the underwear to Light’s tights, before guiding the omega to kneel up, so he could get rid of the thing altogether. When it was gone, L wasted no time pulling Light back down and unceremoniously burying himself inside.
Light threw his head back, steadying himself on L’s shoulders. L groaned into his collarbone.
That is what he was missing. The tight heat around him felt right for the first time this evening. No, it felt better. Like something L has been missing for a long time.
The hurried act of it all made his insides feel like cotton candy. The knowledge that Light was just there, waiting with this lovely wet hole between his legs, perfect for L to bury his cock into.
He grabbed Light’s hips and started to guide him up and down, fucking him at a leisurely pace. Light’s face was scrunched up and his mouth fell open. L could feel the pressure building up in his belly.
Light felt divine around him, bouncing involuntarily on his trembling legs, up and down.
“L…”, the little thing panted.
“Shh…” L caught his lips with his own. “I’m gonna make you feel so good, little omega.”
With no real leverage, the omega swayed, squirming on L’s lap. He watched where their bodies connected with wide glossy eyes.
L buried himself once and deep, drawing a whimper from Light, and pulled out.
Light looked at him confused, before getting thrown back on the bed. L followed, turning Light on his belly and settling himself behind him.
“Don’t worry, honey,” he slurred. “This way is much more comfortable.”
He guided his cock back into Light’s wet hole and pushed.
Light’s arms gave out and he fell on the mattress. A few thrusts later his legs and knees followed the suit.
L growled, pinning Light down. This would also work. His baby clearly didn’t know how to present to an alpha properly. But not to worry, L would teach him. And for now, he didn’t mind doing most of the work.
He kept moving his hips at a quick pace, each thrust filling the room with an unmistakable slippery clapping sound.
Light mewled under him, face smushed into the pillow. The white shirt rolled up his shoulders, still undeniably L’s. The inner alpha at the wheel of L’s mind burst with possessive feelings at the sight of how owned Light looked.
There was no universe where he could last long for this first knot. Not when Light felt and looked so delectable. Unable to present, but still so good and wet.
He nipped at Light’s neck, starting to feel himself swell up.
“Baby omega…” he murmured lowly. “You feel that? You feel my knot stretching your little pussy?”
Light stuttered, looking back at him with wide eyes. “K-knot?”
“It means I’m gonna come. You’re gonna make me come, sweet thing.”
Light lifted his face from his hiding place in the pillows. “Not inside, don’t-”
L groaned around the mouthful of Light’s skin. He felt his knot expand and release his seed deep into omega.
Light tried to pull away, resulting in a painful tug where they were locked together. L grumbled, catching his omega by the waist and pulling them both into the upright position.
Light yelped when he was seated on L’s lap, forcing more of L’s cock into him. L encircled his abdomen, holding him still as he pumped more come into the omega.
He caught one of his hands and brought it lower where they were locked together, so Light could feel his twitching cock. “Feel that? It’s me. Filling you up. You like to be filled up, sweetheart?”
Light shook his head, staring down with wide hazel eyes. “Please, pull out- I don’t wanna get pregnant.”
L groaned, pumping more cum into the omega. “You will look so good pregnant.” He scraped his teeth against Light’s shoulder, clearing his mind for a second to release more of the calming smell into the air. He rocked their hips together. “You will look so good all round and glowing, carrying my pup.” Swollen and big because L planted his seed into Light’s flat belly. ”You’re so gorgeous, honey, you would make such a pretty pup for me.”
Light’s sob turned into a moan when L brought their joined hands to rest on Light’s belly and pushed. “The prettiest little omega, making me a pretty little pup.”
Light squeezed around him, L barely catching him as he tumbled forwards. He moved his cock inside Light rhythmically, holding Light through his orgasm.
He spent the remaining time waiting for his knot to go down petting Light’s soft skin and murmuring filthy praise into his ear. It didn’t take long. He was an alpha in a rut, holding the most precious, wet omega in his lap. He went back to full hardness inside Light.
Light gasped when he started to move again, holding him close to the chest, as he rutted into the tight little heat.
He yelped when L brushed his fingers over the little button between his legs.
“Agh… L…,” he continued to thrust into his pussy and rub his clit at a matching pace. “L!”
“Does it feel good? Does my little omega mate feel good?”
“I-I- agh!” stuttered Light at a particularly hard thrust. “Feels- feels good-”
“Good,” he flicked his clit making the omega jump in his lap. “Because you feel so good, your pussy feels so good.”
He rambled, brain clouded by the feeling of Light squeezing around his cock. “Such a good mate, letting me in so easily, presenting so well. You were just made for me, little omega, huh? You were, you fit so well around my cock.”
The incoherent sounds coming from Light matched L’s incoherent train of thought as he fucked into the omega in his lap. He moved his hips at a mid-pace, each thrust reaching deep into Light’s insides.
His other cradled Light’s stomach, moving up and down with the omega’s ragged breaths, feeling every tremble. He caressed the soft belly, drunk with the knowledge that just centimeters away, his seed was making its way deeper into his omega’s womb.
With his other hand massaging Light’s clit, it wasn’t too long before he felt the omega tense. He pushed L’s hand into his crotch, rubbing against it furiously, squeezing around L’s dick in the process.
L moaned into his neck, teeth scraping that delicious swollen little spot in the crook of his neck. Not stopping his ministrations on Light’s clit he fucked into him harder, holding the omega through the shakes of his orgasm.
He hummed lowly in his chest, rocking the omega until his breath became steadier. Then he carefully pulled out and he spread them both on the bed, allowing them to stretch out their legs.
He pinned Light down, cock nestled into the crevice of Light’s cheeks. He moved the chain out of the way, leaving nothing between their bodies, as he cradled Light close. He stroked his hair, breathing in the heavy divine smell of a content omega.
“So good,” he whispered into Light’s matted hair. “Such a good omega, coming twice on alpha’s cock.”
Light was too dazed to catch the embarrassed whimper escaping from his chest. L rutted between his cheeks. “I’m gonna make you come so many times, sweetheart, knot you so many times.”
He rutted into the slick crack of his ass. “By the end of the night, your belly will be swollen with my cum.”
He bent over to kiss the faint whine off Light’s lips. He pushed out more of the comforting smell, shushing the omega into submission.
Placing one last pacifying kiss on Light’s face, he raised onto his knees.
“Have you ever presented for an alpha, sweetheart?”
Light looked back at him with the sweetest expression. With his red face wet from extortion and pushing it into the pillows, he looked like the epitome of debauchery. He shook his head slightly.
The asshole alpha roared in his chest, forcing him to bend down and put his mouth around Light’s mating gland. His teeth scraped over the gland, making Light shudder under him. He licked at the patch of skin, gathering his instincts and forcing himself to calm down.
As much as he could in this state.
“Baby omega,” he rasped finally. “Never presented. Never gave up this sweet little hole for anyone, huh?”
Light shook his head, pushing his ass into L’s rutting dick.
“Never presented. You don’t know how.” L purred low in his chest. “No need to worry honey. I will teach you. I will show you how to present for your alpha.”
When L lifted his head, Light eyes were wide. “L, I-”
“Shh, omega. Up, up.”
When Light, dazed and a little stupid, made no move to get up, L prompted him up, carefully but firmly. He guided him onto his shaky hands and knees.
He nuzzled into his back, praising quietly. “So good for me.” He nudged his arms to guide him down on his elbows. Keeping his hands on Light’s hips, he pushed his ass up. “That’s how you present, honey. Offer your alpha your holes and not worry about the rest.”
Light breath hitched when L pushed his hand down his back until Light’s chest brushed the mattress. With his other, he pushed his ass flush to L’s crotch.
He stroked his back firmly, caressing the beautiful deep arch he formed in this position. His cock massaged Light’s folds between them. “How does that feel, honey? Does it feel good?”
Light nodded feverishly. “S’good…”
“Feels so right, huh?” He dragged his cock over Light’s pussy a few more times, before positioning himself in front of his hole. The wet thing dripped on both their crotches. “You know why that is, sweetheart?”
He pushed into Light with no resistance. Light moaned around him as his slick opening stretched around the girth of him.
Groaning, he buried himself to the hilt. The daze clouding his mind only grew heavier. Light felt like heaven come earth around him.
He gripped Light’s hips and thrust into him hard. “You wanna know why? It’s because you were made for this. ”
Light cried out as he dragged his cock in and out of him at a right angle. His mouth fell open under the force of L’s thrusts. L wondered how it would feel around his cock.
He bent down, to lick a stripe of sweat dripping down Light’s back. His scent was dizzying. “Doesn’t it feel right? Weren’t you made to get your sweet little pussy fucked by a real alpha?”
The jerk of Light’s hips was all the answer he needed. “But you never knew a real alpha, sweetheart, isn't that right? Not before me.”
Light shook his head and L rewarded him with a particularly hard thrust.
“I’m the only one who gets to have this, baby omega? I’m the only one who gets to cum in these tight little insides, right?”
The sound Light made was downright inhumane , which only spurred L on to fuck harder. He gripped his hips, pinning him down with all his weight.
“I will train you so well, baby. I will teach you to present this tiny hole the moment I walk through the door, I will fuck you so good. You won’t ever spend a day without coming, sweetheart, I will keep you open and happy at all times, you want that?”
Light wailed, just only slightly muffled by the pillow. His eyes were shining. “L- L!”
L grabbed his throat to lift him out of the sheets. He kept him in a light hold, fucking forcefully into his guts. “Do you want that, Light? Do you want to be my sweet little omega?”
Light panted, struggling to breathe. “Yes! “Yes!”
The alpha inside L screeched triumphantly, driving his cock into the omega. L dropped his forehead onto Light’s shoulder.
“Oh, my Light. My little omega. Do you want me to be your alpha? Do you want me to keep you, and feed you, and fuck your lovely little holes open?”
“Ah, L- Ah! Yes!” Light cried out. L could feel the words vibrate under his palm. “Please, please, please…”
Feral, L buried himself to the hilt. And again and again. “I have you, omega. I have you-”
“Please, alpha -”
And L. L would like to think it wasn’t him at that moment. Would like to separate the beast that took over his body from himself. Pretend that the ugly thing claiming his mate was something other than simply him.
But this realization would come later. At the moment he couldn’t think anything past omega, and mate, and mine as he sink his teeth deep into Light’s neck.
L came to it slowly. His mind swam lazily on the edge of sleep and consciousness for what seemed forever before he finally was able to flutter one eye open.
The light coming from the curtains was bright but cold like in the early morning. He felt sticky and hot. Both sensations were an indication that he was slowly getting back to himself.
The smell in the room was heavy. It smelled like sweat and sex, but most prominently L’s own alpha scent. Despite that, it was far too easy to pick up on the sweet, delicate scent floating in the air.
And the smell was so lovely, so familiar. Sweeter than L’s favorite sweets. It encouraged him to move, to seek out more of it in the room. Without opening his eyes he sought out the source of it, laying close next to him on the cum-stained sheets. He took a gulp of air, content to breathe in the one scent that always taunted him, each night he spent chained to the sweet and deadly omega…
No.
L opened his eyes, hoisting himself up on the bed. Dizzy, he forced himself to look around the room, the room he shared with Light-
And sure enough, on the cum-stained sheets, there laid his prime suspect.
He jumped out of the bed like he was burned, memories of the previous night flooding his brain with vivid images of Light’s pliant body under his. The chain rattled, muffled by the sheets.
He stared holes into the offending metal, too afraid to breathe. After a few moments when it was clear Light stayed unconscious, he took the chain by its cuff with his other hand and started to pull it from his wrist.
If his mind was a little clearer it would supply him with one or two tricks he learned by working with the FBI to pull his hand out freely. Something about folding his palm and pushing out his knuckles, but as it was, he pulled the cuff free by force after a quick fight. Probably dislocating his thumb.
He ran out of the room, closing the door quietly behind him like a burglar. He needed to think.
He collapsed against the wall, gasping for breath.
He was with the girls last night. He left Light in their room and went to take care of his rut with the two service omegas. That’s what happened.
Except… He started to remember now. He left the room to go back to theirs, lured by the sweet scent. He opened up the door, and Light looked so delectable, spread on his bed, wearing his shirt, saying his name in that adorably confused tone “ L?”
His name. The way he gasped for air between moans of L, and please, and-
Fuck.
Don’t- not inside.
L hoisted himself up on his legs feeling sick. Like a zombie, he found his way back to the room where he was supposed to spend his rut.
Inside, the girls were sleeping soundly on the bed, dressed in pajamas, and looking more unruffled than usually after their visits. The room was not a mess he remembered leaving, and his clothes were neatly folded on one of the couches. He hurriedly threw the clothes back on and started to rummage through the girls’ things.
In the bathroom, he was met with his own disheveled reflection. He moved his hand up, where the dried blood stained around his mouth.
Last night he mated Light.
He leaned back on the wall, staring at his reflection. He wanted to punch the guy. He had never imagined that there would exist a version of him that stupid. He was never one for self-control, but in the context of calories, sweets, or money thrown out a window on the smallest luxuries. Not- Not people.
He bound himself to Light. His beautiful, deadly, clever Light, who was his prime suspect and most definitely, absolutely, undoubtedly Kira for fucks sake-
He broke the game. He was supposed to be a detective, Light was supposed to try to kill him. He was supposed to force a confession out of Light, not force himself on him. He was supposed to end the case and hide Light somewhere away from the world where he could court him properly and make him his mate but-
-there was no use to think about what he was supposed to do. Not when his idiotic inner alpha trampled all over the game by fucking Light into the mattresses.
He needed to fix that. But first things first.
He rinsed his mouth off all the blood and after brief consideration jumped into the quickest shower of his life, where he only scrubbed away the stickiness of his skin, before jumping back into his yesterday’s clothes. Finally, he rummaged through the toiletries until he found a pack filled with pills labeled Plan B. He picked one of them and slipped out quickly.
He got back to the room just as quietly, freezing in place.
Light was sitting on the bed, very much awake. His naked back was turned to him, but he flinched at the sound of doors opening.
Very slowly L approached the bed, not for the first time at a loss as to what to say. When Light finally turned to him, his expression broke L.
A small whimper left Light’s mouth. “I can’t close up.”
Whatever L expected it wasn’t that, but the small voice and the fearful smell coming of the omega moved him into action. He crouched down before Light, “It’s gonna be okay, honey.”
He examined Light, as he sat on the edge of the bed, body curled in a way that allowed him to keep most of his weight off his ass. He covered his crotch with his palm, cupping himself between his legs. His thighs and the sheets beneath him were absolutely drenched with cum. He was trembling and small, and not one bit resembling the smug, arrogant Light who liked giving him a hard time.
Most noticeable of all was the dried blood painted across his body, spilled from the red angry bite mark sitting in the crook of his neck.
“Let me run you a bath,” L forced out, reaching out to pet at his sides.
Light seemed not to notice neither blood nor L’s hands on him, simply choosing to shake his head. “I can’t close up.”
At L’s fogged look, Light glanced down at his hand cupping his crotch. “I can’t-” He whimpered again. “You fucked me too hard, I can’t…”
L’s heart was in his fucking throat. “It will,” he whispered dumbly, moving Light’s hair out of his face. “It will, honey, just let me clean you up a little, okay?”
Light’s lost look didn’t explicitly tell him what he thought about it, but he seemed to be in shock and he needed to get clean, or L would soon cross the line he tethered all morning, the one separating panic from panic attack.
L guided him to raise on his shaky legs. Light mewled pitifully as another surge of cum poured out of him. Just - fuck. Just how many times he came inside Light? Everything after the bite was a blur. L shushed him, nudging him gently towards the bathroom. When it was clear Light was in no position to get to the bathroom on his own, L lifted him up, murmuring apologies as they went.
He put him carefully in the empty bathtub, mindful of his ass and crotch. The chain still wrapped around Light’s wrist rattled loudly against the porcelain. L quickly went to fill the bath with water, overlooking the temperature. When it was filled halfway, he rinsed Light of all the blood and cum, after which he let it spill out. Then started to refill the tub the second time.
This time he added some of the flowery bath salts Watari stacked their bathroom with. This one smelled like strawberry and created enough bubbles to semi-cover Light underwater.
“I’ll be right back,” he murmured, before fleeing out of the bathroom.
Acid crept up his throat as he took in the state of the room, but as much as he wanted to vomit right now, he needed to keep a level head.
It seemed impossible to find a key to the chain in this mess, but he was the world’s best detective. Even in his rut-drunk state, he could do it.
First, he decided on strapping the bed off the dirty sheets, hoping the key would fall from them on his own. He threw the new ones on the bed hastily and opened the windows to make the room smell less like sex and terrified omega. Finally, he managed to find the key under the bed.
When he got back to the bathroom, Light didn’t move from his curled position in the tub. L hurried to his side, bruising his knees on the tiled floor in the process. “Can you give me your hand?”
Light just continued to stare at him blankly. When he got no reaction, he carefully extracted Light’s hand from underwater by pulling on the other end of the chain.
Light’s wrist was a mess but he managed to unlock the ring without too much intrusion. He contemplated washing Light’s hair - conditioner first, then shampoo, then a different conditioner - but finally decided against it, not wanting to irritate the mark on his shoulder any further.
It took some coaxing but after a while, he managed to get Light out of the tub with minimal touching. He wrapped him in one of his fluffy robes and perched on the counter to tend to the wound on his neck. He made a quick job of drying and bandaging up the bite, trying to keep his smell comforting and not spoiled with panic.
Back in the bedroom, he put Light delicately on the bed, watching out for any sights of discomfort. When he was settled L ventured out to bring him a glass of water and a pill.
He kneeled in front of Light, feeding him the pill. Light swallowed both pill and the water obediently, observing L carefully. His face was flushed and warm from the bath. L murmured praise, even though it felt acidic on his tongue.
The tie of the robe slipped loose, exposing the patches of bruised skin on Light’s collarbone.
He would have to put clothes on Light. Eventually. But while a t-shirt would be fairly easy to slip on his shoulders, the rest- he would need Light to stand up for the rest. But that would mean pulling him out of the safety of the sheets he gathered around himself.
So no. A robe would have to do for now.
He tied the robe tighter together and covered the exposed skin to the best of his ability. The collar of the robe was not enough to hide the bandage sitting on the curve of Light’s neck. Light let him work, pliant under his hands like a good omega.
Knocked down from the peak of his rut L was not the cloud-minded beast from the night before, but that didn’t mean the effects of it wore off him completely. He was still buzzing with hormones rushing through his body, pumped both by the rut and the after-effects of the bonding.
The sight of his freshly bitten mate, trembling and smelling like slick and L certainly didn’t help. All of that meant that despite mating just a few hours prior, his bastard of a dick twitched and came back to full hardness.
He shifted in his crouch, trying to hide it. He could feel the moment Light’s eyes zeroed on his dick as he tensed under his hands.
“Hey, no-” L rushed to soothe the scared omega. “Don’t worry about it, okay? I’m not going to do anything.”
That didn’t seem to convince Light, and why would it? He did, he did more than just anything, he-
He rubbed Light’s arms in what he hoped was a soothing motion. The weak part of Light’s smell that still smelled like Light and not L soured in fear.
“Can you-” Light started weakly, with a hoarse voice. L needed to bring them some more water.
For now, he stroked his arms gently. “Anything. You can have anything you want.”
He felt the tremor running through Light. “Can you use my mouth?”
L’s breath left his lungs.
“What?”
“Please,” gasped Light. “Please use my mouth. I’m so sore, I can’t have anything in-”
“Sweetheart,” he breathed. “Sweetheart, no-”
The line. The line was not only fucking crossed, it was gone.
“ - please, please , L, I will suck you off so good, it will feel just like pussy. Please, please, just don’t-
“Baby,” He rose from his crouch to gather Light in his arms. Which- not the best idea, as Light went rigid in his embrace. L was prepared to let him go, but the wiggling and kicking never came.
And L- L couldn't think.
He needed to get out of here. He needed to disappear from Light’s sight, set him up with a sizable fortune, leave the country, and beg for repentance in one of Watari’s beloved churches.
Except L was never a believer, at least not for one of Watari’s entities. And he violated his own false god like an animal.
“I’m so sorry,” the words, as soon as they left his mouth felt too small. Laughable, for him to think they could change anything. He repeated regardless. “I am so sorry, Light.”
There was maybe one thing he wanted right now more than fleeing, but that was the rut talking. And L had more than a wave of disgust to wash away the desire to the darker corners of his mind. But what’s done was done. Nothing was more important than comforting the omega - his omega, his mate - curled into a little ball in his embrace.
He touched Light’s jaw gently, trying to push it up to see. His eyes were big and wet, but no tears have yet fallen. “I’m so sorry. Light, you have no idea-.”
“You bit me.”
L hesitated. “I did. But it’s going to be okay. We will- we will figure it out.”
Light lip trembled as he shook his head, bringing his hand up to the bandage. “You bit me?”
L wanted to catch his lip between his and soothe it like his hand stroked soothingly at Light’s side. “I did, I know, but I promise you it’s gonna be okay.”
“How?”
He swallowed, steadying his voice into something firmer. “I’m gonna take care of everything. I’m gonna take care of you. You will be okay, honey.”
He pressed an experimental kiss onto Light’s cheek. Light eyelids fluttered but he didn’t pull back. At the lack of resistance, he pressed another one under his eye, back on his cheek, and just above his jaw. He concentrated on pushing out a comforting smell, hoping to mask the uncontrollable smell of arousal induced by the rut.
He continued to do so, even when Light’s nose twitched as he subtly scented L. He must have picked up on both smells, but it didn’t stop him from slowly, at the pace of a melting ice cube, unwinding in L’s embrace. He didn’t flinch when L pulled him onto his lap, despite the visible bulge in L’s jeans. When he settled on his lap he must have felt it under his ass.
“Are we mates?” He asked quietly after many minutes of L nosing little kisses onto his face.
L tightened his arms around him, squeezing him into his chest. He swallowed heavily, staring off into the wall. “Yes.”
Light was silent for a moment. Then, pressing his face into L’s throat he said, “Okay.”
L blinked, fighting the stinging in his eyes. “I know, baby. But it’s gonna be okay. You don’t have to be scared. I will take care of everything, okay?”
Light hummed, lifting a hand to stroke the other side of L’s neck. Delicate fingers brushed over his scent gland. “I’m not scared.”
L kissed the side of his head and continued to rub his back in slow circles, mentally telling his dick to fuck off.
There was so much to think about it, even if his mind couldn't focus on anything. No matter how vulnerable the creature in his arms seemed right now, Light was Kira . There was no doubt of that. L revealing to him his knothead nature might have only given Light more reason to kill him.
L mulled over death many times before. He concluded, not long after moving to Japan, that he would only welcome it if came from Light. The task force would probably be safe, as long as they believed Light's innocence. Watari would get off the grid, after deleting all the files. Sure, he would probably miss him, but back home he had a gaggle of successors to train and fill into L’s role. L hoped he would move on from his death quickly. There were some other contingencies placed in the hands of the rest of his employees, but essentially everyone would be okay, with or without L.
Except now, it wasn’t just him. He was an alpha bonded to an omega, as evidenced by the bite on Light’s shoulder. Wherever Light liked it or not, L was his alpha now, his mate. If Light killed him now, in a feat of well-deserved revenge, he would only bring on himself more pain and misery, as the bond sickness would surely follow.
But he would have to worry about that later. There were more pressing matters at the moment.
He kissed Light’s temple. “How are your holes? Are they still hurting that bad?”
Light winced. “It’s mostly my neck now. Kinda overshadows whatever’s happening down there.”
“Can I take a look at them? Just to make sure there’s no tearing.”
The little flush adorning Light’s face and neck deepened. He squirmed on L’s lap sweetly. “If you want.”
L hesitated, his racing mind supplying him with all the reasons why he shouldn’t, but finally, he leaned over to press a small kiss on Light’s lips. Light leaned into it, but L didn’t leave any time for the kiss to deepen. He guided Light back on the sheets gently, to lay on his stomach.
He didn’t take off the robe all the way, just pushed it a little above Light’s hips, allowing Light to bury his face in the fluffy collar. L scented the air, carefully watching out for any signs of Light’s smell turning sour, but it never came. He mostly smelled like L.
Pulling the robe out of the way exposed Light’s smooth bottom, where L’s smell was the strongest. It took the deepest parts of his self-control to not release the guttural moan at the sight.
Light’s holes were red and puffy, but not enough to raise concern. He honestly looked like he was supposed to after a long night of fucking.
L put his hands on Light’s thighs. “Spread your legs for me?”
Light tensed, but followed L obediently. L rubbed slow circles with his thumbs on Light’s skin until the boy lowered his head back on the pillow.
“So good,” murmured L. “Thank you.”
Slowly he moved his hands up to gently spread Light’s cheeks and examine the damage up close. Thankfully there was no blood on the outside. He brushed his finger over his asshole. It was loose but closed, only opening up when L pulled around the edges. The rim was a little red, but as far as L checked there were no tears.
Above him, Light let out a muffled whine at his ministrations. L pressed a kiss to his cheek in apology before moving lower.
His pussy was once again snug and closed, glistening a little with natural slick. He could feel his mouth water at the sight but pushed it down. His dick had no place in this.
He brushed his thumb over the puffy folds, pulling them apart gently to uncover the red little hole. More slick rushed out of it under his touch. Unintentionally, L sighed in a big breath, Light’s sweet smell making his head spin. It looked so small. It was hard to believe that L’s dick was stretching it open just a few hours ago. Not for the first time this morning he wondered how was it possible for him to violate something so little and vulnerable. But Light was an omega and he was made for this.
He retrieved his finger, kissing the swell of Light’s cheek. “Looks good. No tears at all.”
A muffled whimper brought back his attention. He pulled the robe and the blanket around Light and climbed up the bed.
“I’m sorry. Did I hurt you?” Stupid. Obviously, the answer was yes. That was the whole point.
Light shook his head. Some of the tears escaped his wet eyes and fell dampening the pillow. “No, I just- I feel weird.”
L leaned over him, to place his lips on his forehead. He tucked the blanket under his sides. “It’s probably the hormones. The bond makes everything feel weird.”
Light huffed out a wet chuckle. “Sure. Uhm…”
“Yes, sweetheart?”
“Did you- You came in yesterday smelling like- like you’ve been with someone.”
L hummed. “Yes. I use the services of two omegas during my ruts. They have been working with me for some time.”
“So you already came before coming here?”
Barely, but- “Yes.”
“Oh. Hm.”
L moved his hair out of his eyes. “Is that- They are clean, if that you are worried about. And so am I.”
“No, it’s just-” Light looked away. “You came already? You know before? But last night you came so many times, I just thought- I dunno. Does it always last that long?”
L stroked the faint flush splashed across Light’s cheeks. The memory of last night burned itself into L’s sanity. Light has never been with an alpha before. His arrogant little omega, carrying more seduction in his pinky finger than L had in his whole body, has never been with an alpha before him.
He nuzzled Light temple, assembling an answer. “Yes. In most cases, it does last that long. And that many times.” In a world where L didn’t utterly fuck up and courted Light properly, in a world where he opened him up carefully with his mouth and his fingers before entering him like an animal, he would be still fucking him, not satisfied until the rut was over.
Light hummed in acknowledgment. “I think I passed out a little. You know, at the end.”
L jerked, feeling all kinds of gross. But the grossest part was how his dick twitched at the memory. “Yes. You have. Light, I’m so sorry…”
“And you kept fucking me?”
L was silent, at a loss as to what to say. None of this was right. There was nothing he could say to make any of it better.
Light huffed out an amused sound. “That’s kinda hot.”
L must have been still rut-drunk, because he did not hear that right.
But then Light moved his chin up, baring his neck, and something inside L fluttered painfully.
He opened his mouth over a dark bruise he put on Light yesterday. He licked the mark apologetically. “I fucked up. I should have more self-control than that and I hurt you. I don’t expect you to forgive me, but I really am so fucking sorry, Light.”
Slim hands came up to tangle up in his hair. “Don’t be.” L lifted his head to look into Light’s shining eyes. Light took it as a cue to lean up and press their lips together in a slow kiss. L held back a moan forming in the back of his throat. Light’s mouth felt hot and soft and every bit like heaven and hell under his. Light pulled them apart, but not by much. “It felt really good- you felt so good. At least the first couple of times.” Light placed a sweet peck on his lips. “I was just freaked out that it could last this long.”
“I should have stopped,” whispered L. “I should have never started-”
“What’s done is done. I will know the next time.”
L blinked. “What?”
Light leaned back on the pillows. With gentle hands, he tucked L’s hair behind his ears. “You’re my alpha now, right? That means we spend ruts and heats together from now on. Right?”
His voice was the steadiest it was since they woke up, but still held the tone of insecurity to it. Asking him for guidance.
L wanted nothing more than answer yes. Yes, because Light was his, he made Light his but first- “Only if you want to. After all this, you still want to…?”
Light leveled him with a serious look. “Do you want to fuck any other omegas?”
He wanted to laugh. Even when he was fucking other omegas, he could only think of the particular omega in his arms. “No.”
“Then you will call your rut assistants and tell them their services won’t be needed anymore.”
L closed his eyes, hiding his grin in Light’s chest. “If you only knew how many times I imagined you saying that.”
Light stroked his hair. “Oh, so the handcuffs weren’t strictly for investigation purposes? Who would have thought.”
L’s bubbling laugh was stopped short by the vivid image of Light struggling to get away from him, pulling at the chain.
Slowly he took one of his hands from his hair and brought it close to his face. Light continued to stroke his hair with his left.
His right hand was adorned with a blooming dark bruise, curling around the wrist. Upon further examination, there was no broken skin, but the bruise looked nasty anyway. He brought the hand closer to kiss delicately at the dark skin. He mouthed at the scent gland there, drinking in more of the sweet scent. Light’s chest heaved under him.
He continued the trail of kisses up to his palm and knuckles. Light turned his hand to brush across his cheek.
“L?”
“Hmm?”
“You are my alpha now, right?”
L hummed into his warm palm. “As long as you’ll have me.”
Light was quiet for a bit. “You know what that means?”
Pausing, he hoisted himself up to look at Light properly. Light was watching him with sane clever eyes.
“If you are my alpha, it means you need to drop your suspicion of me.”
It took him an embarrassingly long moment to process the request before a surprised laugh bubbled out of him. He leaned closer to kiss Light with all the mirth he was feeling in his chest.
“As usual, Light-kun’s deduction skills precede mine.” He looked into those beautiful hazel eyes, so clever and biting and so open in front of him. “That’s a very fair conclusion. If I am your alpha it means I provide for you. Give you everything you want, keep you happy, keep you mine. If you are my omega then I have no choice but to keep my omega safe. Kira or not.”
“You know that if this is some twisted way of you trying to make me confess I will kill you, right?” He looked so beautiful right now, petulant and flushed from L’s kisses. “I will actually kill you, with my bare hands, and I won't care if that makes me look like Kira.”
Gorgeous. Sweet as candy.
He kissed the scent right off his delicate neck. “If it comes to that, I will help you to make it look like an accident.”
Light’s laugh resounded through L’s core.