Archive of Our Own ^beta

Soobin knew he shouldn't, knew as an acclaimed responsible tutor, he had no business starting a relationship with the 19 year old college teen he was supposed to be teaching advanced mathematics to, but it wasn't entirely his fault. Kai was the one who had kissed him so innocently, confessing he liked him more than he should. Kai's shy, uncertain soft lips had felt so good on his own and he couldn't bring himself to deny the sweet boy a thing even if it was his first kiss. 

It soon became something they did when they were alone, after their lessons; they kissed often. Nothing serious, just a few reassuring pecks when Kai solved a difficult equation or when Kai would pout because he didn't understand a question. Kai would always smile so cutely, clinging to Soobin like there was no other place he'd be. Soobin liked that, liked it a lot.

The kisses eventually turn into full on making out sessions and before long, Soobin doesn't know how he went without it before. Tongue kisses were the best, especially because Kai would make the cutest gasps and moans, not so silently begging for more. Therefore, it was only a matter of time before Kai was spreading his legs for him, asking for more and Soobin had a weak constitution when it came to saying no to Kai.

Which would explain their current situation at the moment. They were in the campus library, supposed to be studying but somehow Kai had shifted in his seat until he ended up in Soobin's lap. To anyone walking by, they would look like a cozy couple sharing a textbook while studying. When in reality, Kai had made a home there, rubbing his tempting ass there against the tutor's slacks continuously. Soobin had tried to ignore it at first and focus on the heavy hardcover on the wooden table but Kai made it so difficult.

Suddenly he hears something that sounds like a pencil fall on the floor and rolls under the table.

"Silly me! I dropped my pencil!" Kai says with faux surprise, a smile tethering on his lips. He slides down from Soobin's lap until his knees hit the soft carpet. 

"Hyuka-ya," Soobin warns tentatively and is only met with innocent eyes and palm on the growing tent in his slacks. "We're in public, we can't. Someone can walk by and see us." 

A playful grin graces Kai's cute face. "Your cock doesn't share the same sentiment oppa." He presses harder against his tutor's growing erection. 

Soobin grabs Kai by his jaw from under the table, forcing him to look up at him. "That's because I have an eager slut in my lap." His grip is almost too rough but he knows it only turns Kai on further. 

Kai lets out an airy laugh but doesn't respond, busying himself with freeing his tutor's thick cock from its tight confines. Soobin looked around with caution, there was no one in their general area due to the time of day but he could see a few students in the distance between bookshelves. If they were to look up, turn their heads or walk over, they would see them. For some reason though, that's not enough for Soobin to stop Kai from licking his cockhead into his wet mouth. In fact, he grabs hold of Kai's locks and watches the teen eagerly choke himself on his dick. 

"Fuck, Hyuka," Soobin whispers thinly into the air. His eyes lower, adjusting the thick frames of his glasses and swallowing down his sounds of pleasure as Kai blows him, his slick tongue sliding up and down his underside with practiced movement. Kai made for such a pretty sight. He had everyone fooled into thinking he was a sweet kid from a nice family and while those things were all true, they didn't know the kind of cockslut Kai really was. Something that Soobin had a part in. 

Just as he's getting into the tight warmth of Kai's throat, the latter pulls off with a wet pop. He strokes the length while staring at Soobin with what could only be described as 'fuck me' eyes. 

"I can't focus correctly unless I'm stuffed with your cock and come. You made me this way Soobin oppa, take responsibility ah-!" 

Curse Kai's silver tongue. Their frequent sexual activity had made the once shy inexperienced teen into a confident little deviant who knew exactly what he liked and how to get what he wanted from his tutor. And Soobin, despite how he pretended to be the voice of reason, was just as weak for Kai and his intentions. 

He tugs Kai up and back into his lap, the teen's legs around his waist. Soobin slots their mouths together, dipping his tongue past Kai's more than willing lips, tasting himself there. The teen moans needily, trying to pull Soobin closer but the latter's grip remains as a reminder of who was really in charge. Soobin's fingers trail down Kai's body, lifting his baby blue sweater to stroke his soft tummy before going towards his goal; unbuttoning his pants with trained fingers. Kai keens into his mouth as Soobin rubs his moist clit through his underwear. 

"So wet and we only just started our tutoring session. You need it that bad, Hyuka-ya?" Soobin asks, his digits pushing the thin fabric aside to slide along Kai's folds. 

Kai covers his mouth with his sweater sleeve, his eyes already gazing over as he nods erratically. 

Soobin shakes his head, feigning disappointment when in reality his cock throbs with arousal from the pretty boy in his lap. "You're in no position to continue with your studies like this. I'll have to take care of you like a good tutor so you can focus again."

He pulls back and stands. Kai whines needily and prepares to beg but then he's being turned and shoved forward on the top of the open textbooks. Kai braces himself on the hard table and looks back at Soobin with wide eyes.

"I thought you were worried about someone seeing us," Kai teases lightly, watching his tutor stroke his throbbing length.

"Then we're gonna have to be really quiet, hm?" Soobin says, with a crooked smirk. He knew it was a risk, they were in a public place after all and anyone, professor or student could fall victim to the role of innocent bystander and witness their debauchery. They risked serious consequences if they got caught but for some reason that just excited Soobin more and he knew Kai felt the same. 

He trails his fingers against the soft inner thighs of Kai, admiring the way he trembles under his touch. 

"Oppa," Kai urges, but quickly regrets it when Soobin spreads his lips to view his pink entrance. He bites his sleeve to quiet his moan.

Soobin couldn't put up a front, he was just as addicted to Kai and as he pressed the tip of his cock past Kai's fat folds, he knew he'll never grow tired of the delicious heat enveloping his length. Kai moans, rolling his hips back against his dick until his tutor is balls deep into his cunt. 

"Fuck Hyuka-ya, you're gonna be the death of me," Soobin whispers low enough for only them to hear. 

"Hah, Oppa fills me up so well-hmp!" Kai gasps when Soobin slaps his palm over mouth, shoving his fingers in. 

"Lower your voice," Soobin warns, his cock twitching inside Kai's tight snatch. "We have to be quiet. You can do that for me, right baby?" 

Soobin can't tell if Kai whines from the endearing pet name or because he hasn't moved yet but it really doesn't matter because the teen bows his head lower and gives him a shaky nod. He smiles, dipping his digits down on Kai's plush tongue.  

"Good baby. Now let Oppa take care of you." He purrs, slowly backing his cock out before plunging back inside. He finds a steady pace, not wanting to go too fast, despite how much he knew Kai wanted him to, knowing if he really went all out, there would be nothing stopping Kai from wailing on his dick. 

Kai holds the edge of the table with his hands, bracing himself for the hard thrusts that manage to drive them both insane with lust. The warm glide of Kai's walls feel even tighter and Soobin couldn't believe he was fucking the tutoree boyfriend in a public library. It was far more arousing than anything had prepared him for. It was true that anyone could see them, see him pounding into Kai who was pinned underneath him, taking each inch like a good boy but Soobin couldn't bring himself to care in the moment.

Kai heeds Soobin's warning, barely makes a peep, his mouth stuffed with his sweater sleeve and Soobin's fingers. Only a few small gasps escape and it's kind of disappointing for Soobin. One of the things that pushed Soobin over the edge was Kai's incessant moans and breathy calls for his "oppa". If Kai was truly quiet, it wasn't nearly as fun.

"Baby," Soobin says, his voice soft and affirming. He moves his fingers under Kai's sweater, rubbing over his sensitive nubs. Kai audibly whines but not nearly as loud as he usually would. "Come on Hyuka-ya, you can voice how it feels for me, can't you?" 

Kai sniffles, the sound is unmistakable to Soobin's ears and he stops mid thrust. He turns Kai over so he's laying spread eagle on top of their study material, his swollen pussy and tight taint on full display for his tutor and while the sight itself is magnificent, it's not what captures Soobin's gaze. 

"Fuck baby, are you crying?" Soobin asks even though the answer is right in front of him. Kai's watery eyes with a reddish hue and tear stains down his cheeks. The tutor's cock throbs and he has to stop everything in himself to not come from his boyfriend's helpless face. 

Kai nods. "F-feels good but I have to be quiet for Oppa." He rasps and Soobin bites back a groan. Within all the times they had fucked, Kai had never cried. He would whimper and moan about how good it felt but Soobin hadn't seen him ever shed tears. His eyes were a dark chocolate haze, half-lidded, pupils blown wide, and his bitten lips hung open just enough for his slick pink tongue to poke out. He already looked entirely fucked out and they weren't even done yet. Christ. 

"Feels that good, Hyuka? Baby crying cause he can't moan like the whore he is?" Soobin coos as Kai sniffles again, looking so gone and pathetic. Soobin taps his tip against Kai's wet pussy before pressing back inside. "My baby is so pretty even when you're crying. I know it's hard to hide your voice but we have to be quiet unless you want to be found out." 

Kai shakes his head in understanding, his arms reach for Soobin, holding him close by his shoulders. The position was entirely uncomfortable, the books' hard covers and pointy edges pressing into their bodies but Soobin couldn't care less about the pain his body would be in later. The teen under him, completely capturing his attention. 

"Tell me how it feels," Soobin urges.

"Aah Oppa," Kai pants, millimeters away from Soobin's parted lips. "So good, I want you to come in me, please, please. Haven't I been good oppa, I want it so bad," He's babbling, more desperate tears fall and Soobin can't resist grabbing him by the jaw and dragging his tongue over his soft cheeks, licking up the wetness. He moans deeply, even Kai's tears tasted sweet. 

"Yeah Hyuka-ya, you've been a perfect student, you deserve a reward for your hard work," Soobin kisses his boy, his hips fixated on a slow deep thrust to avoid making the table shake. Kai yanks him close until their faces are touching, allowing Soobin to hear every delicious whine right next in his ear.

"O-oppa is so dirty for fucking me in a library but I love it. Your big cock makes me feel so full, hits every spot- hm I love it so much," Kai whispers a bar of lewd words before biting Soobin's ear. "Come in me Oppa." 

Soobin is finished upon hearing that, he slams his hips into Kai one last time, his cock twitching as he fills the teen up with his load. 

"Fuck Hyuka-ya," he gasps loud, muffling his noise into Kai's neck and sweater. His release rocks through him and for a moment he forgets where they are, only able to focus on Kai and his filthy words that sent him to the brim. 

Kai kisses Soobin lazily as he orgasms himself, legs holding his tutor’s waist while they both come down.

"Hyuka...you did that on purpose," Soobin says later, putting his spent cock away while Kai carefully adjusts his pants back on his waist. 

Kai smiles, only reaffirming Soobin's suspicions. "You were being a pervert about me crying so I wanted Oppa to lose control too." 

Soobin can't find it in himself to be actually bothered. He came harder inside Kai while having discreet sex in a library than any other location. Kai's words were just fire to the fuse. 

"How can I not? You drive me crazy," Soobin smirks, rather pleased that his partner was just as perverted as he was. He adjusts his glasses and looks at the table. The textbook pages were folded in odd ways because of their naughty actions. Soobin closes them, while fixing the pages and stacks them up. He then turns to Kai, whose cheeks still wore a hint of pink. He licks his lips. 

"...How about we skip tutoring today?"