Archive of Our Own ^beta

Chapter Text

Kimi opens the door to his flat to discover a fellow uni student just about to knock. 

A fellow student with what appears to be most of his belongings with him. 

“Hi,” the young man gives a shy wave, “my name is Sebastian? I think your landlord mentioned me? I’m here to room with you?” 

Ah yes, that. 

Kimi was quite frankly very fucking annoyed. When he had moved into this flat next to campus he had very specifically told his dad, who owned the building, that he did not want a roommate. Now suddenly his dad is demanding that he give up space in his flat for this random uni kid. 

He stands at the door, hoping by giving a menacing glare it would put the other guy off, but no. Sebastian stands there, looking expectantly at Kimi. 

“I said I don’t do roommates. Go away.” Kimi moves to shut the door in Sebastian’s face, but the younger man isn’t undeterred. He in fact sticks his hand through the door. 

“Actually, the landlord told me you’d do this, so thank you for trying to act all menacing, but I’ve nowhere else to go as my entire fucking flat is flooded. So open the damn door and let me in.” 

Kimi raises an eyebrow, used to his size and build frightening others into submission. It turns out that it doesn’t work on Sebastian. 

Maybe he was a brat, something whispers in Kimi’s head. 

He quickly shuts the voice down. 

Sebastian meanwhile, gets the door open and begins piling his crap into Kimi’s living room. He looks around the flat with interest. “Nice place you have here, I like it.” 

“Don’t get used to it.” Kimi mutters, a threat lacing his words. 

“Nice to meet you too.” Sebastian sing songs, grinning at Kimi. “You won’t even know I’m here.” 

Kimi doubts that, very much. 

As soon as Sebastian has left to do whatever bio majors do in their free time, Kimi calls his dad. 

“I need my freedom, he can’t stay here.” 

“Kimi, you cannot kick him out. I don’t have any other temporary accommodation and he’s got good references.” Mika says mildly, used to Kimi’s gruffness by now. 

“I need my privacy, you said you’d give it to me.” 

“Kimi, listen to my words. He doesn’t have anywhere else to go. Do you want me to kick him out on the street?” 

“Yes.” 

“Kimi. You don’t mean that. Just, deal with it for now okay? It’s only temporary and then you can have your flat all to yourself again. 

Kimi ends the call wishing he could just pick Sebastian’s things up and throw him out himself, but then decides he doesn’t need the headache from his dad. 

He would put up with it for now. 

Sebastian turns out to be a good roommate, surprisingly. He cleans all the dishes, always remembers to buy the milk and he’s good about labeling which things are his inside the fridge.  

Sebastian also makes good on his promise of not being heard of, he’s very quiet when he is at the flat. He spends his time either revising or visiting friends. So Kimi has some semblance of privacy, even if it’s not what he wants. 

Sebastian also loves to talk. He jabbers about anything and everything, and is not put off when Kimi grunts his replies to anything he says. Sebastian isn’t intimidated by Kimi at all, it’s rather refreshing. 

Kimi is used to holding the power over relationships, Sebastian makes him feel off kilter. 

Everything is fine up until one night Sebastian sits down on the sofa and feels something digging into his back behind the sofa cushions. He frowns and wiggles around before he reaches behind the cushion and pulls out a ball gag. 

He blinks in amazement and turns to Kimi, who’s absolutely frozen beside him. “Is uh-is this yours?” 

Kimi snatches it out of his hands, face giving nothing away. “It’s none of your fucking business.” 

Sebastian raises his hands up placidly. “Hey, it’s okay. It’s more than okay if you like that sort of thing. But to be honest I don’t really see you as the type to use that.” 

Sebastian wishes his mouth didn’t run with his brain, he instantly snaps his mouth shut. 

“Oh? And what type do you think I am?” Kimi challenges, making Sebastian meet his eyes. 

“I-nothing. I swear!” Sebastian swallows hard, wishing he hadn’t said anything. 

“I want to know.” Kimi waves the ball gag between them. “Especially since you think you know me.” 

Sebastian feels his heart hammering in his chest. “I-well. I uh-” 

“Speak.” Kimi commands in a low tone, one that seems to go straight to Sebastian’s dick instead of his brain. 

“I think you don’t wear it, but others do.” Sebastian whispers, voice small. “Especially since you don’t talk all that much.” 

Kimi’s lips twitch in a small smile, and he gets up from the sofa. “Not that it’s really any of your business, but yes. I don’t wear it, others do.” 

He leaves the room to head to his bedroom, the one place VERY off limits to Sebastian. 

Leaving Sebastian sat on the sofa with his brain whirling chaotically. 

That was, something. 

“I still can’t believe you’re rooming with Kimi.” 

Charles shakes his head as he looks up from his textbook in the library and watches Sebastian reread the same page for the millionth time. 

“Well, I am.” Sebastian doesn’t meet his gaze, eyes on the words swimming in front of his eyes. 

“I’ve heard rumours.” Charles leans in to whisper conspiratory, despite the fact the library is mostly empty. “Kimi fucks.” 

“He fucks.” Sebastian says dryly, looking over at Charles. 

“He’s into kinky fuckery.” Charles says, “not my words, but Daniel’s.” 

“Daniel likes to gossip and he likes to fuck around so, is his word the truth?” 

“Well, I heard that Valtteri had an arrangement with Kimi. Kimi likes his partners to be uh, submissive. He’s very selective with who he chooses to sleep with.” 

“Is that so?” The unwanted image of the ball gag enters Sebastian’s brain, but he pushes it aside. “I’m not one to gossip. Kimi is okay, he’s a good roommate.” 

“It’s only because he’s not allowed to kill you. Too much paperwork for his dad.” 

Sebastian snorts softly. “I can’t blame the guy for wanting privacy. You’re just lucky you’re rooming with Carlos.” 

Charles shrugs. “I’m just saying that Kimi has a type. Everyone talks about it.” 

“Well I’m not everyone.” Sebastian replies, not wanting to discuss Kimi like this. It felt bad because Kimi was actually a decent guy. 

Who owns a ball gag he didn’t use on himself. 

A decent guy. 

Sebastian is studying late at night one evening when he hears Kimi coming in late. He knew Kimi had gone on a date so he wasn’t surprised. 

What Sebastian is surprised by, when they both retire to Kimi’s room, is how loud they both are. 

Sebastian associates Kimi with quiet, serenity. This is not serenity. 

“On your knees.” Kimi orders from his room, his voice sending a thrill through Sebastian and he cannot help but imagine Kimi talking like that too him. 

Not that this is the first time he’s done that. 

“Good boy.” The praise is low, gentle, and exactly what Sebastian likes. 

Without thinking, his hand wanders under his sweatpants and wraps around his dick, which is already half hard. He lazily strokes it, listening to Kimi’s low tone and the praise coming from the Finn. 

It should be dirty, listening to Kimi having sex next door, but Kimi’s voice is hitting all the right buttons in Sebastian’s head. 

He strokes his cock slowly, picturing himself on his knees for Kimi, the ball gag being used to keep him quiet. He pictures Kimi praising him for being good and it doesn’t take long for Sebastian to spill all over his hand. 

God he feels like a teenager all over again. 

He heads to the bathroom to clean up, feeling something like shame settle on his shoulders. 

“Good night last night.” Sebastian says the next morning over breakfast, why he does he will never know. 

“You heard?” Kimi asks, eyebrow raised as he looks at his roommate. 

“The walls are paper thin, of course I did.” Sebastian retorts. 

“Then why didn’t you tell us to stop?” Kimi asks, watching every single move Sebastian makes. 

“Oh yeah, I was just going to bang on the wall and embarrass whoever was with you.” Sebastian replies, shaking his head. 

“So you listened instead.” 

Sebastian chokes on a mouthful of cereal. “No!” 

“I saw you, doing the walk of shame.” Kimi smirks. 

“I fucking hate you, no I didn’t!” 

“So I didn’t watch you walk into the bathroom cleaning yourself after wanking off?” 

“Shut the fuck up!” Sebastian scrapes his chair back from the table. “I’m leaving. I’ll crash at a friend’s place tonight.” 

“Sebastian-” 

But Sebastian grabs his backpack and slams the door hard. 

Kimi realises he’s fucked up. 

Kimi had to admit, he had grown fond of Sebastian. At first it was just tolerance, but over time he had grown to like the young German. 

Sebastian was bold, fearless and said things like they were. It was something Kimi admired in him, even enjoyed. 

Sebastian wouldn’t just roll over for Kimi, like everyone else. It was nice. 

Kimi knows he’s pushed it too far, knows he shouldn’t have said what he said. But it had been on his mind since Sebastian hadn’t shown disgust over Kimi having the ball gag. 

His mind had tortured him with the mental image of using it on Sebastian for weeks. 

He was despicable. 

After Sebastian storms out, Kimi grabs his phone and calls his dad. 

“Dad, I have a favour to ask.” 

Sebastian gets the call while he’s at Charles’ place, currently dying of embarrassment. 

“Hey Seb, it’s Mika. Listen, I've found a flat for you. But it’s a little way away from campus. It’s yours if you want it.” 

Sebastian thinks about Kimi, about not being in the same flat as him anymore. 

“Sounds perfect. I don’t mind the commute. Text me the address?” 

Sebastian moves out a week later, grabbing all his belongings and using Carlos’ car to drive to the new place. 

Kimi wasn’t there to say goodbye. 

The new place would take two bus commutes, but Sebastian is prepared for that. He gets the keys from Mika and sets about making the flat his own. 

It’s as he’s looking in the cupboards that he notices something. 

A karting trophy sits right at the back gathering dust. 

He grabs it, curiosity making him see who it belongs to. His heart sinks when he sees the name on it. 

It’s Kimi’s. 

He thinks back to one of the conversations he’s had with Kimi, about where they had been before uni. Kimi had told him his dad owned a few buildings and that he himself had lived in one that was too far from campus. 

This was Kimi’s old flat. 

Kimi must have sent him here after upsetting him. 

Something unfurls in his chest. This was Kimi saying he was sorry. That he had crossed the line and was now giving Sebastian a place to be away from him. 

The selfish, understanding prick. 

He stands up, dusting off his hands and looking around the empty flat. He couldn’t stay here. It felt wrong somehow. 

He locks the flat, climbs back into Carlos’ car, and drives back to Kimi. 

It’s almost like it was months ago. Kimi opens the door and Sebastian is standing there with his bags again. 

“What happened to the flat?” Kimi asks, face trying to hide it’s emotions, but Sebastian sees right through him. 

“I don’t want it if it means we can’t be roommates.” Sebastian answers. “I get why you did it, but we could have also talked it out.” 

“I hurt you, made you feel ashamed. It wasn’t my intention.” Kimi says quietly. 

“Then what was your intention?” Sebastian looks around and then motions to Kimi. “Lets go inside.” 

They end up sat together on the sofa, wondering where to even start the conversation they were about to have. 

“Look.” Sebastian clears his throat. “I felt embarrassed to be called out. I didn't know you had seen me and I was not thinking clearly. It didn't mean you had to send me to another flat!” 

“I shouldn't have pointed it out.” Kimi counters, shaking his head. “I meant to just lightly tease you, I didn't mean to embarrass you.” 

“You know we could go around in circles on this. Maybe that's pointless and we need to talk about the other stuff.” Sebastian says, shaking his head. 

“Like?” Kimi asks, eyebrow raised. 

“Well, uh you caught me wanking off on hearing you with someone else. That's not normal is it? Not roommate behaviour.” 

“I agree, but also what I'm into isn't conventional.” Kimi answers. 

“You're a dom.” Sebastian doesn't beat around the bush. 

“I am.” Kimi nods. 

“That's why you wanted a place to yourself. Your room probably is also a playroom.” 

“Not exactly.” Kimi scratches at his neck. “Not an entire playroom. I don't have the space.” 

“And the people you bring home are subs?” 

“Correct. But they consent to it before we do anything.” 

Sebastian cannot help but remember how Kimi sounded when he praised whoever was in his room and he shivers. 

“I wanted this flat to myself because I knew it would scare other people away, but not you. You didn't seem afraid.” Kimi looks at him. 

“It's actually the opposite.” Sebastian whispers in a small voice. 

“I had a feeling since you found the ball gag.” Kimi looks amused. “I wasn't sure how to ask if you liked to be degraded sexually.” 

Sebastian huffs softly. “I guess that would be an awkward thing to ask.” 

“So you're okay with this?” Kimi gestures around them. 

“I am.” Sebastian nods, but there's something in his eyes. 

“What is it?” Kimi asks. “Please tell me what's going on in your head.” 

Sebastian thinks about Kimi's tone, of his room that was also a playroom. 

“I don't want you bringing other subs back to our place.” 

Kimi blinks. “Uh, and why exactly don't you want me doing that?” 

Sebastian doesn't meet his gaze, biting his lip. 

“Sebastian? Look at me.” Kimi puts that edge to his tone that sends a shiver through Sebastian and makes him look at him.

“Tell me why I can't bring someone home?” Kimi asks calmly, but his eyes are like fire. 

“Because I want to be your sub.” Sebastian answers, voice soft and trying to be brave. 

Kimi smiles, like he knew that was what Sebastian was going to say. “That could be arranged. Will you be a good sub for me?” 

Sebastian loves the tone of his voice. Like Kimi wants to praise him for a good answer. It's delicious, but also he's still him so of course he has to give a little grin and answer, ‘maybe, depends on how good a dom you really are.” 

Kimi loved a challenge. 

“Maybe I could persuade you to be good.” Kimi murmurs, moving closer into Sebastian's space. 

“Hm. Maybe yeah.” Sebastian pretends to act bored, but his eyes dance with mirth. 

Kimi gently grips his chin, lifting his head up to his and giving a slow smile. “Don't think you can win. You will give me your submission and you will be so good for me. Because you're a good boy, aren't you?” 

Ah fuck. That was his weakness. 

Kimi huffs a gentle laugh and then leans in to kiss Sebastian, leading the kiss and cupping Sebastian's cheek. 

Sebastian fucking melts and returns the kiss, enjoying the feeling of Kimi so close to him. He can feel the older man asserting himself and he smiles, pulling away from the kiss so Kimi has to chase him. 

“Fucking brat.” Kimi murmurs when they pull away for air. “You can misbehave all you want. You will listen to me.” 

Brat. Sebastian doesn't mind being that. Especially with Kimi threatening him in that delicious tone of voice. It would be fun to make Kimi work for his submission. 

“I want to see your playroom.” Sebastian says, smiling at him. “I want to see if it's up to my standards.” 

“No.” Kimi says softly and Sebastian’s face falls, so he continues. “We won't be going immediately to the playroom. First we will get to know one another, have dinner and then we will discuss rules going forward.” 

“So serious. I can't even get a little peak?” Sebastian pouts at him cutely. Trying to use all his persuasion. 

“Not yet. Dinner first. Talk things over. No one goes into my playroom without the rules agreed upon and our hard limits.” 

“You're not going to make me sign a contract are you? And tell me what I can or can't eat?” Sebastian frowns. 

“Fuck no. Do not mention that crap to me.” Kimi snorts. 

‘Well good. Just checking you weren't one or those people who read that rubbish and decided he knew everything there was about bdsm.” Sebastian nods. 

“Don't insult me like that.” Kimi says dryly. He moves to get up. “Right, do you have an early morning class tomorrow?” 

Sebastian’s heart melts at Kimi’s consideration of his schedule. “Not tomorrow no, why?” 

“I'm taking you out to dinner.” Kimi answers, moving to grab his coat.

Sebastian gets up off of the sofa and grabs his own. “What were you thinking?” 

“Italian?” Kimi asks, looking at Sebastian. “Since you told me I commited a sin when I made spaghetti last time, I thought you'd prefer it if I took you out to a proper Italian restaurant.” 

“You broke the spaghetti in the pan!” Sebastian argues, but he's impressed Kimi remembers he loves Italian food. 

“And for that sin, I apologise. Now are you coming to dinner?” Kimi asks, holding out his hand. 

Sebastian gives a soft smile and takes his hand in his, nodding. “Let's go.” 

Kimi leads him out of the door and to his car, opening the passenger door for Sebastian without prompting. 

It makes Sebastian feel warm. 

They both get into the car, but before Sebastian can tighten the seatbelt, Kimi reaches across and does it for him, keeping eye contact with Sebastian as the German feels the straps tighten around him. 

Fucking hell he was fucking doomed if he was getting horny just from this act alone. 

“Making sure you're secure.” Kimi says softly, giving the belt a little tug and clipping it in. 

“Thank you.” Sebastian says in a hushed tone, his cheeks scarlet. 

Kimi gives another one of those dazzling grins and then starts the car, driving them both into town. 

It was exciting, this new thing with Kimi. This was only the beginning of what could possibly be a beautiful partnership between them. 

Sebastian couldn't wait. 

Chapter Text

“Good boy.” 

The words seem to go right to Sebastian's dick, which is already hard and leaking. The words make him squirm from his position kneeling in front of Kimi, who stands before him lazily stroking his own cock. Fuck Sebastian cannot stop looking at it. He loves Kimi's cock, especially when it was in his ass. 

Although giving him a blow job came a close second. 

“You ready to take my cock?” Kimi asks, voice even more raspy than usual and Sebastian loves it. He loves hearing how he makes Kimi feel. 

At this point he is so well versed in their play that he knows he can't speak. Not until he's told to. 

“Speak.” Kimi says, his tone making Sebastian remember early on in their relationship when he first used that tone. He still loves it now.

“Yes, Sir. I'm ready for your cock.” Sebastian says, looking up at him expectantly. 

“Such a good boy.” Kimi whispers, cupping the back of his neck and drawing him towards his cock. His fingers lightly brush over the collar at his neck. 

Ah yes. Kimi had collared him recently, a beautiful diamond collar which sparkled under the lights in Kimi’s room. It had made Sebastian cry tears of happiness. He was owned by Kimi, it made him feel so good.

What was even better than knowing he was collared was Kimi’s dick. Which he takes into his mouth hungrily, moaning at the salty taste on his tongue as he hollows out his cheeks and sucks like his life depended on it. 

Kimi groans above him, whispering praises in Finnish which make Sebastian work that much faster to get Kimi to come. He ends up forgetting to breathe. 

Kimi's fingers stray from his collar to the nape of his neck, pulling the hair there until Sebastian arches his head up. “Breathe, Sebi.” 

Ah yes breathing. That was overrated when he was sucking Kimi’s dick. 

Kimi waits for him to take a few breaths before guiding him back onto his cock, enjoying the watery eyes and the spit on his lips. He looks so debauched, kneeling there used by Kimi. It's everything the Finn had ever wanted in a sub. 

Sebastian goes back to sucking his dick and Kimi's brain goes offline. 

It doesn't take long for Kimi to reach his high and he starts fucking into Sebastian's mouth, enjoying the way the German gags on his cock. 

“I'm going to cum.” Kimi warns, thrusts getting erratic as he feels the feeling build. 

He cums hard into Sebastian's mouth, his sub greedily swallowing his load. 

Fuck. He loved this man. 

He gently pulls out of Sebastian's mouth, moving to grab a wet wipe as Sebastian licks the cum dribbling out of his mouth. 

He tenderly wipes it away, praising Sebastian softly. “Well done, such a good boy for me. You deserve a reward.” 

Sebastian smiles at this, but his eyes move to look at the clock and he lets out a gasp. “Shit, I'm going to be late for class!” 

Kimi blinks and looks at the clock as well. “Oh crap. I didn't see the time.” 

Sebastian tries to get up, but he's been kneeling for over an hour and the play has left him disoriented. 

“Seb, sit down on the bed.” Kimi says softly, moving to grab some water and a protein bar. “You're not ready to go to class in this state. You're late already, it doesn't matter if you're even later than you are now.” 

Kimi was very strict on aftercare. He knows he won't be leaving Kimi's room until his dom is sure he won't go into subdrop. 

He sits down on the bed and lets Kimi look after him, knowing that he was already late and he can't make that any worse really. 

Sebastian has the embarrassment of walking into class 20 minutes late. He keeps his head down and finds his seat next to Charles and refuses to meet anyone's eyes. 

It's as he's taking out his notebook that he notices Charles staring at him. 

“What?” Sebastian asks, his hands going to his face and down to his neck- 

Oh. His collar is still on. Fuck. 

“The amount of balls you've just had to walk into class wearing a diamond collar.” Charles shakes his head. “Man, Kimi must really love you.” 

“What do you mean?” Sebastian asks, trying to hike his jacket up to hide his collar. 

“Kimi never collared his subs.” Charles tells him. “None of them.” 

Sebastian blinks, feeling like his world has just tilted on its axis. “Uh, what?” 

“I'm not joking. Kimi's subs never got collars. I swear if they had they'd have bragged all over campus about it.” Charles snorts.

“What the-” Sebastian's hand reaches for the collar, stunned by Charles’ words. 

“Like I said. Kimi must really love you.” 

Sebastian nods, feeling dumbstruck. Fuck. 

He had to talk to Kimi.

Sebastian comes home after clases have finished, his head in a spin. 

“I tried calling you but your phone was off, you still have your collar on.” Kimi says as soon as he sees him, looking worried. 

“You love me?” Sebastian blurts out, looking at Kimi seriously. 

Kimi blinks at his words. “Not what I was expecting you to say but yes?” 

“No, I mean it. You really love me?” Sebastian asks, his hands moving to his collar. “I was told you don't do this for your subs usually.” 

Kimi sits down on the sofa, patting the seat next to him. “Sit.” 

Sebastian moves without thinking, sitting down next to Kimi and looking down at his hands. 

“I do love you.” Kimi says gently, voice soft. “And I've never collared anyone else.” 

“But why me? Why now?” Sebastian asks, looking shocked. 

“Are you really asking me that? I want to keep you.” Kimi's voice is soft and full of feeling. “You make me laugh and smile and we fit together.” He lifts up their hands, placing Sebastian's smaller hand against his own larger one and linking their fingers. “You fit me perfectly. You're mine, and I am yours. I want you for as long as you want me.” 

“I want you forever.” Sebastian whispers. “Even after graduation. I want you so much it sometimes scares me but it feels so right.” He looks at their joined hands. 

“I could do forever.” Kimi says, smiling the smile he only ever gives Sebastian. 

Sebastian sniffs quietly, wiping at his eyes, but Kimi lets go of his hand and silently reaches out to wipe away the tears himself. 

“Forever sounds pretty fucking good.” Kimi continues, gently cupping the back of Sebastian's neck and drawing him into a deep kiss. 

Sebastian melts, returning the kiss and filling it with his unspoken love. 

He loved Kimi. It was scary and thrilling but also wonderful. 

Forever sounded amazing.