not very friendly of you.
pairing: mechanic changbin x f reader
warnings: mature content! MDNI! profanities, childhood best friends, (accidental) fwb, implied mutual pining, oral (m receiving), piv, praise kink, exhibitionism, car sex, implied multiple rounds.
word count: 4.9k
summary: one night Changbin jokingly instigated a sexual relationship with no strings attached and you easily agreed in the name of experience. the dynamics between you and him remain consistently the same as prior to the arrangement; him being obviously in love with his best friend, and you being the oblivious best friend; him being your personal mechanic, and you being his loyal customer. or so he thought. the more often he spends those lustful nights with you, the more he doubts this fwb arrangement will work any longer.
“Wanna go again?”
But his cock was already rubbing against your sensitive clit when he whispered in your ear. The ragged breath that followed made his question sound more like a desperate suggestion.
Beneath him, you were still evening your breath from the burst of blissed out sensation he’d brought upon you just moments ago. Your eyes closed and lips parted and legs trembling, his release trickled out of your cunt onto his car seat. With the pads of his forefinger and middle finger, he rubbed the thick fluid and smeared it gently over your clit, making you squirm at the sensation.
In the cramped space of the backseat where there was little to no extent to stretch your legs and arms, your body had become weary and stiff, and yet as if enchanted, “yes… yes, please…”
Carefully he parted your legs more to make room for him to move. His strained grunts fanned against the side of your face as he sank the tip of his cock into the warmth that enveloped him leisurely just less than twenty minutes prior. Your whines dammed up his ears as he slid in his length all the way to the base into your warm walls, the thin ooze of your juice made it easy and pleasant.
“You even said please,” he stared at your lips for a moment, before shaking his head to leave the thoughts behind, and kissed your blushed cheek instead, “my pleasure, darling.”
…
THUMP!
A chain of curses flew out of Changbin’s lips as he rubbed the back of his head to ease the sting. It was the umpteenth time he got distracted and bumped his head against the hood of the SUV he was working on since early that morning.
The erotic images from a couple nights prior constantly crept into his mind like a stubborn colony of ants crawling up at the smell of a bread crumb. He snorted at his own incapability to drive away that memory.
What he had with you was nothing more than a sexual arrangement he had shamelessly and half-jokingly proposed on a random movie night after an accidental makeout. Being childhood and long-time best friends, he hadn’t expected you to say yes, let alone so easily as if it was an arrangement for another movie night. Twice a week you both ended up seeing each other to satiate your lustful needs, which progressively intensified to a regular agenda he came to anticipate the more he got to have a taste of you.
But the reminiscent of those passionate nights had begun to take up too much space in his everyday life. He pictured how your body writhed under him, how you called his name time and time again, how your hands reached to caress his neck and bring him close, how your hair was damp with sweat, how effortlessly beautiful you were naked.
He wondered if it would affect him the same if he were to pleasure someone else—someone he wasn’t falling in love with.
Damn that arrangement. If only he had been a little braver that day to propose something more romantic than occasional sex. A relationship, for an instance. But he was too cowardly, afraid that the decades of friendship would shatter just because he looked at you as somebody so much more than just a friend.
His train of thought was cut short by a familiar ragged engine sound in the distance.
Changbin wasn’t a tad bit surprised when he saw a familiar old blue sedan nearing and lining up in the lot of the Car Wash and Auto Detailing where he spent most of his days. Through the wide open windows Keshi’s ANGOSTURA pierced through the warm spring air. The bluetooth he had put in the old car’s stereo two months ago seemed to work fine.
He dropped the wrenches and walked over to greet the driver he had gotten bored of seeing.
“At this point just tell me you can’t stand being away from me too long,” he said when you climbed out of your car. He wiped the grime remnants off his fingers with a washcloth that was already besmirched with stains of motor oil. “But we’re fully booked today. Come back in a week.”
“Is that how you talk to your loyal customer?” He couldn’t hold his grin when you clung to his arm, wearing your fakest heartbroken pout and woeful eyes to get him taking your car in for repair. Again. This was the third time in the last two months.
The car was well nigh crumbling. At first he had always thought there was too much work where it wasn’t worth the sweat he and his team shed and definitely not the large sum you set aside from your paycheck. But the car was one of the last of your brother’s possessions he let you have before he passed away nine years ago. Changbin knew you wouldn’t give up on the ancient vehicle before it totally gave up on you first. And giving up on you was what the car had been doing hence the amount of repairs it needed in a short period of time. It was only a matter of time until the car succumbed to its demise. Until then, Changbin was willing to fix anything there was to fix for you.
But where’s the fun if he didn’t playfully insult the junk you treasured most?
“You’d be faster on foot.” Changbin remarked with a snort after a quick check.
You weren’t aware of the dirty smudges from his coveralls smearing your pleated skirt and white pullover as you kept on pestering him by clinging to his arm. In spite of his indifference, he discreetly relished in every second of that physical contact.
“I’m always on time,” you pleaded, “so please?”
“Chan got himself this antique convertible car of his dream but his carport is too small for two cars to squeeze in,” he spun on his heel and headed off to the repairing station, nodding his chin in the direction where a shiny red Hyundai sedan, Chan’s old car, was parked in the corner, “he wants to get rid of her as soon as possible. What do you think?”
Changbin knew you wouldn’t give a damn. But Chan asked him to talk you into purchasing the car just in case.
As predicted, you gave the red Hyundai an uninterested glance before stalking behind him towards a customer’s car he mended. He pulled out a wrench from the pocket of his coveralls and bent over the SUV’s engine. He added half-heartedly, “save the money and save more from your monthly paycheck for four to five months. I’ll talk to Chan if you’re interested.”
“Or you can take the money and fix my car for me,” you insisted, looking over your shoulder at a black mustang parked in the lot reserved for the staff. A majestic vehicle that was the silent witness of a number of obscene activities shared between you two. “Besides, you haven’t paid your car off yet, have you?”
“No,” he replied casually, getting a little too entertained by your persistence, “but I’m taking care of that just fine, so your point is?”
You leaned against the SUV’s door with folded arms, “you're not very friendly right now.”
Changbin chuckled, “I don’t think we’ve been very friendly to each other these days.”
“Meaning?”
At the sight of your innocently curled eyebrows, Changbin bursted out laughing. His mouth ran faster than his brain sometimes. No regrets. But he was relieved you failed to grasp what he meant. “Forget it.”
“So how long does my car need to be in the workshop?”
He placed both hands on his hips, fingers hooked onto his coveralls pockets.
“A week maybe,” he glanced at your sedan, a mischievous glint flashed in his gaze when he looked back at you, “but like I said we’re fully booked right now and I don’t suppose we’d get even a tad bit available for the next couple of weeks. I’m gonna need more people to fix every troubled part of your car if you want it back faster, that means we’re gonna be short-staffed at the carwash station.”
It was supposed to be a mindless joke that shouldn’t be taken into consideration.
You were supposed to climb into the passenger seat of his mustang.
He was supposed to give you a ride home as usual.
But then you asked if there was a spare uniform and where the locker room was. Changbin laughed and shooed you away to your next agenda, even almost took off his coveralls and drove you home, but Jisung and the other staff in the carwash station had been in fact overwhelmed with the queue of customers even before Changbin could drag some of them into the repairing station to help fix your car.
“I don’t have anything to do at home anyway,” you insisted, winking an eye at him.
He thought it wouldn’t hurt to have an extra pair of hands.
Until you came out of the staff room and he gave himself a mental punch in the face because the only spare uniform was impossibly tight.
One could say the same thing about his coveralls that not only did its tight fit flaunt his impeccably sculpted pecs, it was also parading his perfectly round ass and his bulging arms that the short sleeves could barely provide a cover for. It was safe to say he had attracted a good number of loyal customers with his build alone. Adding his sexy brain and charming nature to the mix, he became a target of flirting remarks and dinner invitations. The workshop had easily dodged financial crisis, happy ending.
But this time it wasn’t about him.
The polo top of the carwash team’s uniform was so tight around your neck that you left the top buttons undone. The hem of the shirt barely covered your waist and couldn’t be tucked into the waistband of the shorts that there was a good portion of skin every time you bent over. And the shorts… they hugged your ass nicely. Way too nicely that it left a pinch to imagination—to his imagination precisely.
Apart from sneaky glances of curiosity, the other staff gave little to no further interest and focused on their respective chores. But that was mainly because they knew who they were going to deal with if they stared too long. Changbin was already hard to please, so fishing out even a little bit of his wrath would be like digging their own grave.
The hood of your sedan was opened. Changbin bent over to check the engine. He tried, because his gaze kept straying away towards the carwash station. It would’ve been better if Jisung had offered spare coveralls. It was getting harder to look away especially from the shorts because he knew what was beneath—
THUMP!
How many more times did he have to bump his head against a car hood? He internally scoffed at his questionable professionalism in your presence.
“You okay?” Chan was approaching with his usual essential tools in hand. “You’ve been very distracted.”
From the grin stretching on the older’s face, it was safe to assume Chan knew exactly what—or who—had caused that distraction but chose to tease the younger either way. “I wonder what makes her terribly oblivious when you’re this obvious.”
“Mhm,” Changbin agreed, “but I used to hide it very well.”
Chan opened the door and checked the dashboard warning lights, before immediately sliding out again. He looked in the direction of the carwash station where you and Jisung were guiding the cars into, “I’m surprised your possessive ass didn’t run riot when she came out in that. Our customers are very pleased with the view, you see.”
Changbin knew what Chan was talking about, but Jisung wasn’t assigned—as per Changbin’s own request—beside you to solely ensure you did your part well. Changbin trusted the younger could stave off anyone who crossed the line.
“My advice,” said Chan, settling a creeper in position, “don’t wait too long.”
Changbin snorted, and Chan slid under your car.
You were spraying excessive dirt off of a jeep as it was loaded into the wash. Jisung pointed at the spots that needed an extra cleaning while spraying dead bugs off of the windshield himself.
As soon as you were done and Jisung was guiding the jeep to steer into the wash, the driver instead rolled the window down and spoke to you.
Changbin didn’t have to come closer to catch the jock’s eyes falling to your lower half more often than they should. You laughed at something the driver had said, whipping your head around and looking directly at where Changbin was no longer bending over and was instead standing by the bumpers of your car with folded arms.
He didn’t want to jump into conclusions and thought you were speaking about him to the man as you could’ve talked about your wrecked car or about Chan on the creeper under your car or perhaps even something else entirely different. It wasn’t until the man offered him an awkward grin and a flash of annoyance before rolling up the window and entering the wash.
Changbin wasn’t curious about what you might have told that man at first. But seeing Jisung busted a gut beside you and shook his head while looking at him, Changbin couldn’t help but internally enquiring what could be so funny.
…
The sun had almost set and the majority of the staff had gone home. After showering, Changbin scurried over to his car. He organised his belongings on the backseat and wiped the leather seat clean (that was already clean). He did the same to the front passenger seat. Then he sat behind the wheel, waiting.
An overwhelming scent of musk from his perfume occupied every nook of the interior of his mustang, and wearing perfume wasn’t part of his routine going home. Usually he would only give his body a quick rinse to wash off the grime and dust after having spent the whole day grappling with stinky engines, and settle on a proper shower at home. Not this time.
He didn’t wait long before the passenger door swung open and you rushed inside with your own bag and a chunky looking tote on your lap. The floral scent of your perfume mixed with his musk made the smell inside his car a little dizzying, like walking in the aisle of an endless row of perfume shops.
“Do you not have anything less bigger?” You tried to adjust the hem of the black hoodie that buried your frame in its thick fleece. There was a reason why you had bolted from the shower room to the parking lot... “And maybe some pants?”
Changbin leaned over to you all of a sudden, causing you to recline back onto the seat in surprise. The back of his hand subtly grazed over your bare thigh when he fastened your seatbelt.
“You look amazing.” He teased, starting the engine and departing to the main road.
The chunky tote bag was borrowed from Jisung for your half-wet pullover and skirt. Changbin had tried to wash the motor oil stains off of your clothes earlier with soap and baking soda, and while the remaining light brown patch, like tea stain, wouldn’t have been noticeable on any darker fabric, it was a different case when it came to white clothes. Of course.
“Sorry about your clothes. I’ll buy you prettier ones.” Said he when you tossed your bag and the tote onto the backseat.
“Partly my fault for hugging you and wearing white to the workshop, but I’ll take the offer. I’m free tomorrow.”
He briefly glanced at you with an annoying wriggle of his brow, “is it a date?”
“What else? Field trip?”
He giggled.
“By the way, the jeep driver,” he cleared his throat, “what did he say to you?”
“Just some stuff about his dick,” you shrugged, then your eyes narrowed in a teasing manner, “you already stared when I looked. Why?”
“Gotta make sure you do your job right.”
“So you were definitely not staring at a particular pair of cheeks?”
His crooked smile was enough of a confession.
He slowly pushed the brake as the vehicles around were beginning to move slower. “And what did you say to him?”
“I said,” you beamed, gaze intently affixed on the smooth outline of his face, trying to catch even the subtlest changes in his expression at your response, “it’s hard to satisfy me when the inside of my cunt is already reshaped into the shape of my boyfriend’s big dick.”
Changbin subconsciously clenched his jaw. Something twitched down there.
“Jisung thought it was funny,” you added, “but then he actually asked if I was serious about your cock’s size. He wasn’t the least bit interested in whether or not you’re really my boyfriend…”
“Everybody thought I am.” He said.
“…or whether or not we actually fuck. Is it way too obvious what we do behind closed doors?” You chuckled.
“Chan and Jisung know I’d be with you most of the time when I don’t have work, and according to Jisung I smell like you sometimes. It’s not rocket science for them to piece things together.” Now Changbin wasn’t sure what he felt when he said these things. It was always obscure to him. He got turned on at the thought that you’d willingly use him whenever somebody tried to flirt with you, but at the same time, the way you talked about these things so casually cracked his ego a little bit.
He was going to say something but you beat him to it.
“I gotta tell them that you start everything most of the time because look, a little compliment for your dick and there it is,” Your eyes dropped to the tent he didn’t realise had formed in the middle of his sweats, “let me help you with that?”
Grey sweats were not made to hide a bulge. Not that he was embarrassed, not after you had so casually praised his cock when you knew all too well how it would affect him. But the thing was, he couldn’t possibly say yes to your kind offer in the middle of traffic, could he?
He could. His needs overpowered his common sense and it showed when he took your hand and placed it over his erection.
You smiled in triumph, giving his clothed cock soft strokes with your palm, deliberately pressing your hand over what felt like the head of his half-erected cock. Your hand slipped inside through the waistband, holding the warm girth in your palm. A couple of gentle strokes later, your thumb rubbed over the tip, playing with the sensitive flesh until not long after there was an evident wet patch on the grey fabric indicating his precum. Just a little more… you could see it from his face and muffled groans.
But your hand slipped out.
“Baby…” Changbin clutched your wrist, stroking your skin with his thumb, “just a little more, please. I’m almost there.”
“I know,” you cooed, “I’ll make you feel better, promise.”
The vehicles barely moved, the sun was dipping below the horizon. The golden hour ebbed into nightfall quickly, guaranteeing secretion now that there wasn’t any more sunlight.
Changbin gave in to the heat of infatuation that would have him overthink once he was no longer affected by your intoxicating touches. He preferred your apartment, or at least the backseat of his car for a proper sex, but it wasn’t the time where he could push you away when you were this good.
In the meantime he had to be satisfied with sitting helplessly in the driver seat while you did all the work.
He clutched the wheel tightly, trying to remain intact into the seat despite the slow pace of your head bobbing up and down as your mouth devoured his girth, eager to swallow all the way down to the back of your throat although it was a difficult feat given the size of his length.
You kept your ass in the air and knees nailed to your seat, the hem of the hoodie rolled down and pooled around your chest. If the car windows weren’t layered with privacy films, the pretty view of your panties and firm ass would’ve been a pleasant entertainment amidst the stress of the rush hour traffic. Changbin wouldn’t have liked it.
While one hand gripped the wheel a little more loosely, the other one slithered across the arched plane of your back and further up to where he felt your wet panties. You whimpered at the touch of his fingers against your clothed cunt, making his fully hardened length twitch in your mouth at the vibration.
You sucked his cock delectably and forced yourself to swallow just a tad bit more until you could feel his tip made contact with your throat. His sweet grunts and gentle caresses on your hair were enough of praises for you, “feels good, take me so well, you’re so good…”
His fingers slipped beneath your panties, one digit sliding up and down your wet folds. He gasped when you pulled your head away completely and swirled your tongue around the head of his length, licking the precum that spilled from the slit. Instantaneously his hand clutched a handful of your hair, pushing you down to swallow his cock again, he was so fucking close at this point you could see the tip of his cock the colour of blood.
“I’m sorry, love,” his fingers ran through your hair softly as an additional apology.
You suckled his cock with a hum, too preoccupied to process what the apology was for.
“That’s it, that’s my girl,” he reclined back into the seat, subconsciously ramming his hips up until the head of his cock nudged the back of your throat over and over again.
Your scalp began to sting at his grasp, you whined. The sudden vibration once again sent an electric bliss to the pit of his stomach. His cock twitched inside the warm cavern of your mouth.
Tears formed in your eyes before they flew down at the intensity. Changbin’s cock grew a little bigger indicating his release, but you tried not to graze your teeth. He didn’t even realise he was holding back just to feel you longer, until he couldn’t take it anymore.
The muscles of your mouth contracted in greedy suck, your palm squeezed firm around the base of his cock that couldn’t go into your mouth, sensing how close he was to climax.
A swirl of your tongue was all it took for him to topple over. At the peak of ecstasy, he closed his eyes tight and humped his hips to feel more of your warmth and how it was drawing more and more of his release. His growls were hoarse, savouring the pleasant shockwaves you were bringing upon him.
The car behind beeped the horn at the time he slipped back to reality.
There was quite a wide gap between the bumpers of his mustang and the trunk of the sedan upfront.
“Hey…” he stroked a hand on your head, helping you off his cock and settling you back into the passenger seat, even fastening your seatbelt back on. One hand tugged at the waistband of his sweats to rest around his hips again, the other hand held the wheel and narrowed the distance with the car in front.
After managing a safe distance, he checked on you. He leaned over, ridding off the messy strands out of your face and combing your dishevelled hair.
Maybe he regretted it.
Because the tears rolling down your cheeks, the mixture of his cum and your spit gleaming in the corner of your lips, your lazy blinks, could be the sole reason for yet another climax.
That was an exaggeration of course, but his cock did twitch.
“Was I too rough?”
“No,” you sighed, smiling, “I liked it a lot.”
As all the cars seemed to move little by little, Changbin’s foot lingered in the air atop the gas pedal when he noticed a spacious gap between the cars on his left. In a matter of seconds he had reached a decision. He drifted his car into the wide gap and to the gate of a hotel.
“You’re not planning to reserve a room here now, are you?” After Changbin parked his car in the very far corner, you glanced around at the vast outdoor parking of the facility with only a few cars in sight, and looked up at the contemporary architecture of the hotel.
“We have enough space here,” he chuckled, but added quickly, “unless we’re planning on doing this all night then I’ll surely book us a room.”
“Just a quickie please,” you giggled, unbuckling your seatbelt, “but can you stay the night at my place? We can just cuddle and watch a movie and sleep.”
He agreed in a heartbeat, “I thought you wouldn’t ask.”
He unfastened his own seatbelt and reclined your seat all the way down, catching you off guard. He lifted your legs and spread them to make space for him to settle in between. Your panties were soaked.
He slid your panties up and let the fabric hang around your ankle, putting your cunt on display. Mirroring his impatience, you pulled his sweats down, his hard cock stood proud against his stomach as if he hadn’t just released pretty much a big load just moments before.
You pouted, your whine sounded more sensual than intended, “wanna blow you again so bad.”
He rubbed his cock against your folds, “what, you want me to retract back to my seat now?”
You wrapped your legs around him, pulling him closer to you. He smiled, “that’s what I thought.”
A wrap was fished out of the dashboard. He rolled the latex around his length.
“You can suck me later all you want,” he leaned down, pressing a kiss to your forehead while his hand guided his cock to align with your entrance, “we’re not in a hurry anyway.”
Changbin thought he might have to keep your car longer in his workshop and make you sit pretty in the passenger seat of his car every day. He wouldn’t mind driving you to work and picking you up if that meant to see you every day.
As the pace of his pounding was progressively getting frantic, his lips moved more affectionately. He left kisses on your shoulder and your collarbones and your neck, making sure to give your skin light sucks until they were adorned by several possessive red marks.
When his lips hovered over your face, he stared at your parted lips. So plump and inviting. He looked up and you were already looking, giving away that you knew where he had been staring.
“Can I?”
It broke the rules.
Kissing on the lips is strictly forbidden as long as the benefits are strictly sexual.
You wanted to give it to someone who shared mutual romantic feelings, you had said the day when the arrangement had been made. Changbin agreed. It was too much to ask anyway.
So, it broke the rules. To make it worse, this wasn’t some sort of a romantic lovemaking where he slowly undressed you on the bed with a night skyline view and a classic love song in the background. This was a lustful quickie as a result of a mind-blowing blow job you had given him earlier.
But you cradled his face in response and he swallowed your moans in an impassioned, wet kiss. His tongue played, and it was rather rough, and yet you could feel it in the kiss that he meant it. That it wasn’t just a kiss he initiated for fun. He wanted it, and so did you.
He could’ve come at the delicious clench of your walls around his girth, but more than that, he felt his heart throbbing abnormally and his stomach tight with pleasure just because your hands cupped his hot cheeks and your thumbs swept gentle strokes on the blushing skin. It was his first kiss with you, and Lords, was it amazing.
Changbin reluctantly pulled away from the kiss to let you breathe. “Okay? Was I too rough? Too much?”
Your lips were a little swollen at this point. “I love it.”
Burying his face in your neck, he grunted, half-high, “gotta satisfy you, yeah?” His thrusts slower but deeper, “gotta reshape your walls into the shape of your boyfriend’s big dick like what you said to that man?”
Something flashed in your eyes, Changbin couldn’t make out what that meant. But you smiled at him, pulling him closer with your legs, hugging him. When he thought you weren't going to say anything, your voice tickled in his ear in a whisper, “my boyfriend’s dick.”
Your cunt swallowed his length all the way to the base. He let you feel the uncontrollable throbs of his cock. He wished he wasn’t hearing things. Boyfriend, you emphasised it.
He rolled his hips a little, making you whine all the more desperately because his cock was pressing right into the spot that gave your stomach a pleasurable knot.
The car seat was wet, stained with your release. At the same time his hips squirmed as he filled the latex with his seed.
He caressed the side of your face, lips planting kisses on your cheeks and forehead.
Boyfriend. He thought to himself. Did you mean it?
a/n: woah it's finally here... i'd put off rewriting this fic for so long. some of you who found me through insta and have read this before, might remember that this was originally leaning more towards pwp, if not very little plot, but since a lot of readers back then wanted a part 2 i thought it'd be better to add more plot. hope you guys enjoyed reading this!
also i was thinking of making a taglist on future posts so let me know in the comments if you'd like to be added! :) <3
