Lena knew she was in love with Kara from the moment she held her and told her that she would always be there for her in her office. She would always have Kara in her corner and she believed it, she needed it to be true.
Finding out Kara had been lying to her about being supergirl was devastating, but deep down Lena knew that the amount of hurt she felt was so strong because it was proportional to the love she harboured for Kara, sweet, gentle Kara.
They've moved past it and even if Lena feels that sometimes Kara still feels guilty for deceiving her the way she did, Lena wanted nothing more than to forget about it. It already took a lot out of her to supress her affectionate feelings for the Kryptonian, she couldn't also ensure Kara every time she felt a sting of guilt over what is done.
Lena wants to think that she is very proficient in hiding her true feelings, after all, she knew Kara was supergirl before she told her and was none the wiser.
Sometimes she feels curious eyes on her when she and Kara laugh over potstickers and how Kara throws any grace out the window when it came to food.
Alex seems to observe them with a bit more commitment than Lena feels comfortable with. But so far she hasn't said anything and Lena is fine with ignoring everything that might potentially shift her and Kara's relationship into something she can't control. The risk of losing her best friend is something she can't even spare a single thought on.
Which brings us to this fateful day.
Lena knows that Kara is not able to answer her every call right away. She might not even be on the same planet or the same universe at the time, but after complete radio silence for three whole days, she starts to worry.
All her calls go to voicemail, all of her texts are on sent, not read.
She doesn't want to come across as overbearing, so she decides to stop by CatCo first. A bag of donuts in her hand she rides up the elevator, nervously thumbing over her fingertips.
She doesn't know what would be worse: finding out that Kara has been missing all this time or seeing her at her desk, simply having ignored Lena's calls.
The elevator doors open and Lena walks into the wide open space, her eyes focused on the spot she knows is Kara's desk. It's empty.
The relieve she feels is short lived. Is Kara on a mission? Is she in danger?
Nia spots her as she walks out across the floor.
"Hey Lena!"
Lena snaps out of her thoughts.
"Oh, hey Nia."
"Can I help you?"
"I was looking for Kara. I tried to get in touch with her, but she seems unavailable, so I thought I just drop by some sugary sweetness."
She dangles the bag in her hands, nervously nibling at her lower lip.
"Oh, well, Kara hasn't been to work all week. She seems to be dealing with ... alpha-issues."
Nia whispers the end of the sentence, not needing everyone to know that Kara is apparently dealing with an intense rut.
"Oh."
Lena blushes, she looks down trying to compose herself. Her heart is beating fast and loud in her ears, her thoughts racing a hundred miles a second.
Kara is in rut. She has been out of work for DAYS. She probably has someone to help her through it. Someone other – than Lena.
The thought twists her insides and she doesn't want Nia to catch on. She takes a deep breath.
"Well, I guess I'll have to eat those myself then."
Nia studies her for a second.
"Or you could drop them off at her place. Alex said she usually locks herself in her apartment."
Lena freezes. So she's alone? Or maybe she just doesn't want anyone else to know about her rut-partners (plural?), especially not her sister.
Lena doesn't want to ask, but she desperately wants to know.
"Thank you, maybe I will."
Lena sports a smile and tells Nia goodbye as she walks towards the elevator again.
Maybe I should just stop by Kara's place, what's the worst thing that can happen? For starters, she might not be alone. But what if she is? What if she suffers all by herself and has nobody to help her through it?
Lena feels hot and instead of overthinking it any further she finds herself in the hall in front of Kara's door. How she got there? She doesn't remember, it's like she was set on autopilot.
She hesitates.
"Come on Luthor." Lena quietly pumps herself up and then she knocks.
There is nothing but silence for a moment. Lena takes a deep breath to steady herself and that's when she realizes it: the potent smell of rut pheromones. They're subtle, but they seem to be getting stronger by the second.
"Lena?" Kara almost whispers through the door.
"Yes, it's me."
Kara opens the door, only a crack, but it's enough for a wave of her pheromones to engulf Lena and she gasps. Kara winces. Her hair is in a messy bun, her forehead shiny from the sweat.
"Sorry, I'm ..."
"Don't apologize, Nia told me you were... in rut."
"Oh?"
"I was worried, you didn't answer your phone and I stopped by at CatCo and ..."
Lena has trouble sustaining her train of thought, she can feel her heartbeat accelerating with every breath of alpha she inhales. And she knows Kara can hear her heartbeat. It sends her into a loop.
"Yeah, sorry. I kind of broke my phone and I haven't had time to get a new one."
Kara eyes her with a small furrow between her eyebrows.
"Lena, you shouldn't be here. It – it's really bad this time and I ..."
"Of course, I just thought I'd drop by some donuts. Letting you know I'm here for you." Lena registers how her revealing she knows about Kara's rut and offering to be there for her might sound. "I thought you could use – a friend."
Kara opens the door further, her knuckles on the door are white.
"Lena." She says, her eyes moving between blown eyes and the paper bag in Lena's hand. "Thank you, but ..."
"Here." Lena offers the bag.
Kara takes a second and slowly grabs for it, their fingers almost touching. The anticipation of Kara's finger only slightly brushing hers is too much, Lena lets go and the bag falls to the floor.
Blushing furiously, Lena moves forward, bending down to right her mistake.
"Shit, I'm sorry."
"Lena." Kara breathlessly whispers as Lena moves back up, now standing right in front of Kara.
"I – I'll just put them on your table."
Lena moves past Kara, putting the bag on her kitchen table. She turns to see Kara staring at her, mouth slightly open, but otherwise frozen in her spot.
"You should really go."
Lena can hardly hear Kara's words, her heartbeat loud in her ears.
"I should." But she doesn't move. Kara swallows, her mouth apparently dry.
"Lena, I'm – it's bad, I don't think I can be around you right now." Kara closes her eyes, and Lena can see through her tight shirt that every muscle in her body tenses.
"Why?"
Kara barks out a laugh.
"Because you're an omega? And I really don't know if I can control myself at the moment."
Lena takes a steadying breath, Kara's pheromones have long but filled every cavity in her lungs.
"But I could help you."
Kara snaps her head around, large dark eyes fixed on Lena.
"What?"
Lena nibbles on her lower lip, looking down at her fidgeting fingers. Her legs move slightly, she's wet and needs to get some kind of relieve.
"I just – I thought maybe you don't have someone to help you through your – rut."
"I don't."
Lena looks at Kara, there is silence apart from Lena's thundering heart, threatening to jump right through her chest.
"Lena. I can't."
The words hit her like a bucket full of ice water. Kara is in rut. She still rejects her. That is the most horrible day in Lena Luthor's life and she has seen some pretty terrible days.
Kara sees the devastation on Lena's face and takes a step towards her.
"You know I can't."
"Why? That's what friends are for, right?" Lena hates how pathetic she sounds. She almost but whines the word.
"I could hurt you – or worse."
"I'm on birth control, if that's what you're worried about."
Kara smiles as she takes another step closer.
"Good to know, but that's not what I meant."
"Oh."
"Just seeing you standing there, smelling you." Lena blushes at the words. "I almost broke my door just there."
Lena looks at the spot on Kara's door where her hand was. There are clear indents, four on one side, one on the other.
"I've never had sex with someone while I'm in rut. I don't know how much control I'll have."
Lena walks past Kara, seeing her stiffen at the proximity as she passes her. With a small noise the door closes and as Kara turns around her eyes widen. Lena is still inside.
"I trust you." Lena says firmly. She turns around. "I ..." She can't finish the sentence, Kara is right in front of her, their noses almost touching.
"Lena, are you sure?" Lena places her hands on Kara's shoulders, strong muscles flexing at the contact.
"Yes."
"I don't know if I – I don't know if I'll hurt you. You have to tell me, ok?"
Lena nods as she slightly tilts her head closer. She can feel Kara's hot breath on her lips.
"Let me help you." Lena whispers and the next thing she knows is that Kara pushes her into the door. Their lips crash and Lena gasps into Kara's mouth. Kara won't miss her chance and enters Lena's mouth with her tongue. The kiss is passionate and Lena moans. Kara swallows her sounds eagerly.
When Kara pulls away, Lena's lips are swollen and her hair dishevelled. She looks up at her favourite pair of blue eyes, albeit there barely being any blue left. Kara's pupils almost swallow her whole iris.
"Lena." The way Kara says her name is like a lightning bolt through Lena's body. She arches slightly, seeking contact where she needs it most.
Kara groans as Lena makes contact with her centre, her hard bulge rubbing into Lena's stomach.
Lena takes Kara's face into her hands to get her attention.
"Take me to bed."
Two strong hands grab Lena's thighs and in the next moment Kara hoists her up. Lena dives back into Kara's mouth. The blonde never breaks the kiss as she carries Lena over to her bed. Lena curses her for not using her superspeed, she needs Kara, now.
Lena's hips grind into Kara's stomach, the defined muscles providing a hard surface for Lena to find some friction. If Kara wasn't able to smell it until know, she would definitely be able to tell by the warmth of Lena's centre how aroused she already is.
Before Kara drops her onto the bed she breaks their kiss and looks up into Lena's eyes, searching.
"Last chance."
"I swear to god Kara, if I don't have you inside of me within the next five minutes I will explode."
Kara giggles as she gently places Lena on top of her duvet.
"I can arrange that."
She kisses Lena, gently. Lena can feel Kara's smile on her lips and starts to unbutton her blouse.
Kara leans back and watches her with hungry eyes.
"You know, this would work a lot faster with another pair of hands." Lena smirks and yelps as Kara tears open the rest of her buttons. She has no time to complain about her broken blouse, not that she really cared, because Kara's lips are on her collarbone. She's leaving a trail of hot kisses making her way up Lena's neck.
Lena tilts her head, giving Kara better access to her sensitive skin. Her breaths become more and more laboured as she clenches around nothing.
Lena arches up into Kara, the amount of clothing between them taunting her.
"Take them off." She breathily commands. Within a blink of an eye, Kara removes her own clothes. Lena barely has time to admire the naked goddess in front of her as Kara is immediately back on top of her leaving kisses all over her upper body. Kara reaches around and Lena lifts her back for Kara to open the clasp of her bra. Lena shimmies out of it and Kara throws the offending piece of cloth into a far away corner.
Kara looks wrecked, her bun all but gone, leaving her blonde curls to stand in every direction. Her lips are red and swollen and her half-lidded eyes are roaming over Lena as if she was something Kara had been starving for.
Lena's hands wander over her own chest, barely touching herself but leaving goosebumps in their wake. Her nipples are hard and Kara licks her lips as she watches her.
The alpha's hands slowly trace down Lena's sides towards the top of her pants. She follows the seam to the front and starts unzipping them.
"You are so beautiful." She whispers as she pulls down Lena's pants and underwear in one go.
Lena closes her eyes, it's all too much. Her best friend, who she's been in love with for what feels like forever, is about to fuck her into what she can only hope is oblivion.
She feels featherlight kisses on her calf as Kara makes her way up again. Her hands trace up her legs, over her knees, her thighs. The anticipation is killing Lena and just as she is about to verbalize her complaint, Kara places a soft kiss right on top of her clit.
Lena gasps and arches.
"Is this okay?"
"Yes, please. Don't stop."
She can feel Kara's lips smile between her legs as she dives back in. She starts with broad strokes of her tongue along Lena's slit. The heat of Kara's mouth, her breaths against Lena's centre - she might just come before she even touched Kara's cock.
Kara can feel Lena's excitement and doubles down on her clit. She closes her lips around it and starts lapping at it with her tongue.
Lena is no longer capable of doing anything other than letting out strings of breathy moans. She races towards the edge at lightning speed and when she falls over, Kara holds down her hips and guides her through it by gently sucking on Lena's clit.
As Lena starts to regain some consciousness she looks down and sees Kara watching her. It's an intimate moment and Lena can't help but blush.
"You look amazing when you come." Lena's blush spreads along her chest as Kara starts kissing her way up her body. Lena wants to hide, so she moves her hands towards her face to cover it.
"Oh my god, Kara. You can't say things like that."
Kara gently eases her hands from her face, pining her wrists next to Lena's head. Their faces are only inches apart.
"Why not?"
Lena wants to say that it's embarrassing, but then she remembers that Kara just spent some time with her face between her legs and she realizes how misplaced her desire for modesty is.
"I think you are beautiful. And when I look at you, the way you come undone while I can taste you and the noises that you make – I just have to say it. Lena, I need you to know what you do to me."
As Kara confesses what Lena hopes is more than just lust, she can feel Kara's hard cock rub into her stomach. She can't help but moan and surges forward to connect their lips. The kiss is slow, lips moving against each other. Kara is so gentle with her.
One of Kara's hands moves to cup Lena's cheek and Lena takes the opportunity to trail down Kara's body with her now free hand. Kara is all hard muscle. Along her ribs, her stomach – and then finally, Lena reaches the place she has been aching to touch.
She wraps her hand around the base of Kara's cock, causing Kara to moan into Lena's mouth. She moves her hand to the tip, gathering precum and spreading all down Kara's shaft.
"Lena." Kara moans, her eyes closed in concentration, her body tensing further. Lena is mesmerized by the way Kara gently starts to move, slowly pumping her cock into Lena's hand.
"Take what you need from me." Lena whispers into Kara's ear and the effect is immediate.
A small spurt of cum splashes into Lena's wrist and on her stomach. Kara groans both in relieve and frustration.
"Shoot. I'm sorry." Kara looks desperately at Lena.
"Don't be, that's what I'm here for." Lena softly says and leaves a gentle kiss on Kara's lips.
"Oh Rao, Lena." Kara grabs Lena's hand that is still wrapped around her pulsing shaft and guides it to her hips. She repositions them so she now kneels between Lena's legs.
"Kara, I need you." Kara slowly pushes in the tip of her cock. She moans into Lena's neck as she pushes herself further into Lena.
Lena's nails bore themselves into Kara's hip, encouraging her further as her other hand struggles against Kara's hand still pinning her wrist down.
"Yes, Kara, yes." Lena's brain is no longer able to form any sentences and the only thing on her mind is Kara. It's all Kara.
Kara is fully sheathed inside of her and pauses. Her heavy breaths tickle Lena's neck.
"Lena?" Kara seems to be unable to form full sentences as well, but Lena understands what she needs. She needs to know.
"Yes, don't stop."
Kara is big, but the discomfort of being spread so wide quickly turns into an amazing feeling of being filled. Kara fits perfectly into her.
The alpha starts a slow back and forth movement drawing languid moans from Lena. As Kara gains more confidence she starts kissing along Lena's neck, down her chest and the top of her breasts.
She moves in and out of Lena with determination, bottoming out with loud noises. Kara's hand finally releases Lena's and she warps both her hands around her waist. There is something unbelievably hot in the way Kara pins her waist down, the rocking motion of her cock filling her translating to the bed.
"Yes, harder!"
Kara doesn't falter as she speeds up, her bed banging against the wall.
She rocks Lena into the bed, her mouth tracing it's way back up to Lena's. They are both breathing too hard to kiss, but sharing air with Kara like that leaves her more lightheaded than any kiss ever has.
Kara moans Lena's name almost like a prayer and Lena can feel that Kara doesn't move into her as deep as before. The tip of her cock still massages her sweet spot and she can feel the coil inside of her wind up tighter and tighter.
"Lena." Kara moans again and then it clicks. Kara is about to knot, the enlarged base of her cock making it impossible for her to bottom out at this point.
"Do it, knot me, Kara."
Kara whimpers.
"Don't want to – hurt you." Kara says in between lunges.
"You won't, I trust you. I want it Kara, please."
Kara slightly nods as she dives back into Lena's neck. Her teeth graze the spot where an alpha would leave its mark and for a short moment, Lena hopes that Kara bites down in earnest. But they haven't discussed it, this is just rut sex. Lena has no time to let her thoughts drag her down there, because Kara closes her mouth around the skin on her neck and starts to suck.
Lena arches and feels herself opening up. Kara bucks into her one time, two times and at the third her knot slips in.
Lena cries out. It hurts briefly but just as quickly turns into immense pleasure.
Kara's teeth are on her neck, her knot is inside her tight channel and the steady slow rocking motion that Kara keeps up sends her into an earthshattering orgasm. She claws at Kara's back as she feels hot spurts shoot into her womb.
"Karaaaaa."
Kara seems to be completely taken over by her instincts. Her bite holds Lena down, too much movement might hurt her. Her hips are flush against Lena's as what seems to be a never ending flow of cum shoots out of her pulsing cock.
It feels like minutes, but probably only lasted a few seconds, until Kara's spurts taper off. They are still fused by her knot, and Kara releases Lena's neck to nuzzle into it. Her body covers Lena's like a warm blanket and for a few moments, Lena feels happy.
She's dreamed about being this close to Kara, being so close that she doesn't know where she ends and Kara begins. The softness of the spent alpha on top of her as she starts to leave gentle kisses on Lena's chest causes her to do the most un-Luthor thing that she can think of.
"I love you."
She has never slipped up like this. She immediately tenses and curses herself for being so stupid. What a cliché. Just another omega mistaking sex for making love. But Kara was so soft, despite her rut. She had been so concerned and she made Lena come by eating her out first instead of just rutting into her. Maybe Lena mistook Kara's natural kindness for something more. Before she can spiral any further Kara moves up onto her elbows to look at Lena with wide eyes.
She really couldn't have chosen a worse moment to confess her love. They are knotted together, trapped. She is just about to relativize her statement, blame it on post-coital bliss when Kara surprises her.
"I love you too."
Lena stares at her, mouth agape. The lack of response seems to worry Kara.
"Really?" Lena asks after a moment of silence. Slowly a smile spreads across Kara's face.
"Yes, really."
Tears fill Lena's eyes. All this time she suffered in silence, watched Kara from afar and dreaded the day another Mon-El would come along, someone that could relate better to Kara's experience as an alien among humans. All this time she was pining over her best friend not realizing that her feelings are reciprocated.
"I never thought you could see me like that." Lena all but whispers, turning shy despite that fact that Kara is still pretty much inside of her and just admitted to loving her.
"How could I not? Lena, you are brilliant, kind, and have I mentioned beautiful?"
"You might have mentioned the last bit, yeah." Lena smiles.
"I always thought that I could never be with you, because ..." Kara sighs. "Because I'm dangerous. I already lose my cool around you as is. Whenever you are in danger, I drop everything and I don't even care if others need me more. If it ever came down to you or the world – I don't know if I could give you up, Lena."
The tears in Lena's eyes are now flowing freely down her cheeks. She sniffs and cups Kara's face in her hands to draw her down for a kiss.
"Well, I think we've established that even in rut, you are more than capable of keeping me save."
Kara leans her forehead against Lena's chest. Lena starts scratching Kara's scalp feeling more at ease that she ever has in her entire life.
"So, you're not hurt?"
"No, you didn't hurt me. I do have one regret though."
Kara moves to look at her, brows furrowed. Lena laughs.
"We should have done this a long time ago."
Kara laughs and kisses her soundly.
"I'm glad you came over. I don't know if I ever had the guts to make a move."
Lena strokes Karas cheek and dives back into the kiss. Kara's knot softens, however her cock seems to be stiff still.
"Me too. And it seems that my job isn't done just yet."
They dive back into each other, spending the rest of the day making love all over Kara's apartment until they pass out from exhaustion.