Work Text
The field trip had been nice so far. He'd slept during most of the bus ride because he'd been too excited the night before, which kinda made him sad to have missed the sights as the city faded out into calmer landscapes, and the mountain they were supposed to get on top of slowly came into view. Other than that, the hicking and treasure hunt had been fun. Being paired with Katsuki for the hunt had made Izuku a little nervous, but in the end they'd worked fine together—he'd gotten away with only a bit of his t-shirt singed off at the arm—since Katsuki had cared more about winning against the other teams, than being mean to him.Now it was past curfew but even as exhausted as he was, Izuku couldn't sleep.He lay in his futon, on his stomach under the covers, a small torch shining over the notebook open on his pillow. He looked around carefully past the glare of the light, making sure he wasn't disturbing anyone's rest. All his classmates seemed sound asleep, soft snores interrupting the silence every once in a while. Izuku sighed in relief and went back to flipping the pages of his 'Hero Analysis for the Future #1'; he'd recently decided to start compiling a list of all the quirks of heroes he knew about, though he had yet to write anything about actual Pro Heroes, with the exception of All Might of course. The notebook Izuku had brought along was still only filled with his classmates' quirks; they were the easiest to start from since he saw them everyday and could observe them closely.Izuku's mindless skimming stopped near the beginning of the book, at the section labeled "Kacchan" in big, bold hiragana. His eyes traced the page, lingering on the bullet point stating "• Quirk: Nitroglycerin Sweat (auntie Mitsuki's Glycerin + Uncle Masaru's Oxidizing Sweat)"—the words were wobbly, written with hesitation because he'd been unfamiliar with them; had to look them up in a dictionary for the right spelling—, a furrow between his eyebrows. Izuku had spent a lot of time observing and studying his friend's quirk, he'd looked up all the terms related to it and one thing had always made him curious: the fact that, apparently, glycerin had no smell but tasted sweet.Izuku didn't have a way to confirm it, unless he decided to ask Aunt Mitsuki to let him lick her, but that'd be weird, so he couldn't do anything but believe the sources. It left him wondering how that characteristic affected Katsuki though. Izuku knew the blond's sweat definitely had a smell, one that stood out from other people's; it was stronger the more he used his explosions but even at its tamest, Katsuki's sweat had a faint scent reminiscent of a candle after it was snuffed out.What about the taste though?It was Izuku's curiosity which pushed him to turn off his torch and pull the covers off, waiting a minute for his vision to adjust to the darkness. It was his curiosity making him get up and pad toward Katsuki's futon, a few meters down the row of sleeping boys and past the four classmates who separated them. It was his need to know everything he could about Katsuki, which made Izuku kneel beside his friend as he slumbered peacefully on his side.Izuku reached out carefully, inching the covers down the other's shoulders enough to reveal his hands. His heart thumped loud in his ears. Nervous jitters crawled in his stomach. He was thankful Katsuki had tired himself out that day, otherwise Izuku was certain the blond would've woken up as soon as his wrist was grabbed; but he had and he kept sleeping. Izuku was still in the clear; the knowledge sending a rush of confidence through his body.It was now or never.He lowered himself, at the same time bringing Katsuki's right hand closer, and poked his tongue at the tip of his friend's middle finger; he paused and stole a glance down to check for a reaction, when nothing changed, Izuku smiled. And grew bolder. He used the flat of his tongue and ran it over Katsuki's palm, once, twice, three times, until the skin glistened with his spit rather than sweat. He stopped, as the taste settled in his taste buds—slightly burnt sugar; and it'd probably resemble burnt caramel after extensive quirk usage, his brain automatically supplied—and seeped into him; a shudder raked his body, a needy sound rumbling in his chest and his pajama pants growing uncomfortable.Izuku dove down, mouth hungry for more. He caressed every millimeter of Katsuki's hand, wrapped his lips around his fingers to suck on them, tongue curling one way and the other like he did whenever he ate a Popsicle.«Kacchan,» he huffed every time he popped the digits free of his mouth. «Ka— ah— han!»Wriggling on the spot, Izuku pulled down his pants and underwear one-handed without realizing, only trying to ease the pressure building up in his groin. He halted his ravaging of Katsuki's hand to look down at himself, at his dick, hard and pulsing. He flushed. It wasn't the first time it'd happened, but he usually waited for it to go down on its own; this time he didn't think it was going to happen anytime soon: he was too worked up, the pleasant tingles lighting up his nerve-endings feeling too good.Something in his brain told Izuku to touch himself, that it'd feel better, and at that point he was too far gone to fight the urge.He wrapped his free hand around his dick, a moan escaping immediately as his hips bucked upward into the touch. He moved his fist in tentative strokes, back to eagerly lick and suck at Katsuki's fingers as he did; it felt good, his dick dripping in pleasure, but it didn't seem enough and Izuku didn't know what to do to satisfy the craving.«Ngh— ah, Kac-cha— ah!»Desperate for more, Izuku's mouth let go of Katsuki's hand and lowered it to his throbbing dick, guiding it to fist around it. His own fingers closed on the sleeping boy's ones, Izuku kept both arms as still as he could while his hips automatically snapped upward, thrusting into the tight heat and wet palm. Izuku's other hand muffled the moans flowing past his lips without control, his mind firing off a stream of «so good», «amazing Kacchan!», «more!» as he picked up the pace, with Katsuki's hand pumping his dick and the taste of his sweat on his tongue.«Ah! C-crap— Kacch— AAH!»Thick ropes of white spurted from Izuku's dick, some of it landing square on Katsuki's cheek, obvious even in the dark.
----- CHAPTER BREAK -----
Izuku had been keeping an eye on Katsuki for the better part of the evening, watching him bicker with Kirishima and Kaminari as he helped them study what he believed was English; his ears picking up the smooth, if somewhat accented, way foreign words flowed on the blond's tongue. It was so undeniably sexy. Prickles of arousal distracted him from his conversation with Iida and Uraraka; it didn't help that Izuku had been getting a bit restless in the last few days: preparing for the provisional license exam and the demanding load of school work in general left him with little time for his new favorite method to unwind. Not to mention the red tank top he'd taken from Katsuki's hamper had lost all it's scent and was, therefore, no longer efficient in aiding Izuku with getting his rocks off.Katsuki finally seemed to have enough of his friends' inability to follow along his teaching. The blond got to his feet with a sneer directed at Kirishima when the red-haired boy asked him where he was going.«Where do you think, idiot?» Izuku heard his childhood friend say. «'M gonna take a shower, and then I'm gonna go to bed. Unlike you blockheads, I value my sleep.»Izuku tuned out the other two's protests, twisting in his seat to follow Katsuki's retreating toward the boys' communal bathroom. Perfect, he thought. He waited a couple of minutes, then excused himself from his friends' conversation, ready to put his plan in motion. First, he stopped by the shared kitchen, opening the fridge and locating Katsuki's personal sports bottle—the print of a stylish 'BK' standing out in the midst of an explosion leaving no doubt about the owner—. It was easy to pop two pills of water-soluble sedative in it. Grinning, Izuku put the bottle back in the fridge and left the kitchen to proceed with the second phase: acquiring a new article of clothing to masturbate with. The simplest way would be sneaking into Katsuki's room and taking something from the hamper, like he'd done the other times, but he couldn't pass by the chance of peeking at a naked, wet and more importantly, awake Katsuki.It worked to his advantage that his childhood friend had the tendency to prefer showering later than the others, often waiting before bed unlike the rest, who did it as soon as they stepped into the dorms. It meant no one but Katsuki would be in the bathroom area; it meant Katsuki would have his guard down. It also meant Izuku could steal his shirt and hide in the stall next to the blond's while he washed up, and jerk off mere centimeters from a Katsuki who could potentially hear him.«Crap,» Izuku muttered, pausing outside the large bathroom's door to palm at his cock as it throbbed between his legs. «I'll blow so quick… I'm already like this...» He laughed, sliding the door open and closed quietly.He located the occupied stall, the hiss of water and the music coming from Katsuki's phone echoing on the tiles. He kept his steps light all the same, green eyes glued to the shadow of the body outlined in the curtain—how he wished he could just pull it open and step inside, joining his childhood friend under the spray—and the discarded clothes thrown on the bench in front of the shower. Izuku drew closer, hand outstretched, ready to pick up the navy blue t-shirt he could see peek from the lower layer of the pile before—«Ngh…! Fuuuck...»Izuku froze.That was a moan. One which screamed pleasure and left no doubt about what the blond was doing, thinking he was alone in the bathroom. Oh shit, Izuku thought, hastily shoving his knuckles in his mouth to snuff out the wanton groan that almost escaped him. He's jerking off! He flushed, arousal bashing his body so viciously he could've cummed in his pants just from that. He was beside himself with giddiness at having been blessed with such a gift! Izuku hurried to snatch the shirt and dart into the stall to Katsuki's right, not bothering to close the curtain; turned-on as he was, he was going to finish before the blond anyway. He slid down the shower wall, sitting on the thankfully dry tiles. He struggled a bit with his sweatpants, so eager to get to his cock, he had trouble undoing the drawstrings' knot one-handed; the other clutching the navy cotton shirt over his mouth and nose.The smell of overcooked caramel invading his senses, heady and addicting to Izuku as the teen it belonged to; because of the teen it belonged to.Izuku's eyes rolled to the back of his head, moaning as his cock was finally free of it's confines. He spit on his palm, wrapping it around his length and stroking in steadfast flicks of his wrist. Saliva mixed up with pre-cum leaking from the tip in obscene amounts. Each of Katsuki's heated grunts spurring Izuku's own lust; the blond's frustration, underlining the pleasure, tempting him to go in there and offer his mouth or hands to help him out. Izuku tried to time his movements with Katsuki's at first, but he was too worked up—the fresh, bittersweet flavor of burnt sugar on his tongue as he lightly sucked on the sweat-soaked shirt; the smell of extinguished candle wick in his nose; the low timbre of Katsuki's voice, all gravel and urgency, in his ears—and before he knew it, he was pumping his aching cock in frenzied, uncoordinated strokes, cumming with a half-aborted call of the blond's name.«Kacc— ah! Ah!» The water falling and Katsuki's own rasping moans covering the nasty squelching sound of Izuku's fist, milking his waning erection for every last drop of cum.He basked in the afterglow for a moment, a nice buzz of contentment spreading in his veins, until the telltale choked breath of Katsuki reaching his own orgasm came from the adjacent stall, feeding the smothering embers of desire in his gut. Izuku bit his lips. He lifted the navy t-shirt to eye level, a dark, moist splotch of saliva marking the fabric near the nape and, more importantly, unmistakable whitish stains seeping into the cotton at the front. It looked good, but he knew he could do better.Katsuki was back to washing up by now, and Izuku had things to prepare for later.He stood up, tucking his softened cock into his sweatpants and walking out of the shower stall. He paused on the way out of the bathroom, shirt over his nose as he took another sniff, gaze on the shifting shadow behind the drawn curtain.«See you in a bit, Kacchan,» he whispered.A few minutes past 9:30 pm found Izuku lightly landing on Katsuki's balcony, two floors up from his own. It was a simple leap to make and with the most of the class engaged in a movie marathon, no one was going to pop out on their balcony. Or interfere with his alone-time with Katsuki. Speaking of which, Izuku tried the glass door. He grinned when it slid open and the only sounds coming from inside were light puffs of breath; their source laying on the bed, sprawled on his back with an arm outstretched over the side of the bed, a fallen magazine on the floor.On the nightstand, next to the turned on bedside lamp, Katsuki's sports bottle sat innocently and, Izuku noted shaking it, almost empty. Just as planned, he thought, sinister smile playing on his lips as he closed the glass door and stepped forward. The pills should have taken effect by now… Izuku grabbed Katsuki's limp arm, brought it to his lips, nuzzling into the calloused palm; it was dry, he noted with slight disappointment, but it was understandable considering it was early autumn and Katsuki had just showered. It was okay, though, he'd make him sweat soon enough.Reassured that his childhood friend wouldn't wake up—a part of him longed for it to happen; how would Katsuki react, blearily looking up and seeing Deku having his way with him?—, he retrieved a bottle of lube and his phone from his pants, placing them on the nightstand, before stripping down to his underwear. He climbed on the bed, straddling Katsuki's hips. Izuku shivered; the contact of their clothed crotches rubbing on each other, as his body undulated on top of the blond's, fueling his desire.«I'll make you mine, Kacchan,» he promised. «I won't let anyone else take you from me...»His scarred hand cupped Katsuki's cheek, thumb caressing the skin, even more delicate-looking while illuminated by the soft lighting. Longing filled his heart as he gazed down at the person he loved. The pull of those full lips—usually lopsided in a show of arrogance and putting on display rows of perfect, white teeth as sharp words erupted past them—bringing Izuku near like they always did. They were chapped, he noticed, but he didn't mind. He nipped at the supple skin, laving it with his tongue until it was glistening in the light. His hand on Katsuki's cheek moved lower, coaxed his mouth open to allow Izuku entry; he plunged inside, playing along his childhood friend's palate and sucking on a pliant tongue.No room for scathing remarks now, only quiet breaths.Momentarily abandoning Katsuki's mouth, Izuku trailed kisses down the strong column of the other's neck, not resisting to the urge to leave bruises in obvious spots; places where clothes wouldn't hide them and, sure, Katsuki would think of covering them with makeup but that was okay: Izuku would take all of it before going back to his room.Once his lips reached the collar of the black t-shirt, he sneaked his hands under it from the blond's navel; the fabric bunching up under Katsuki's armpits. Bending down, Izuku buried his nose in one of them, licked a stripe along the hairless pit, and moaned; the bittersweet scent of overdone caramel and it's rich taste washing over his senses and satiating a part of his brain which constantly craved them. It was a testament to how long he'd been close to Katsuki, the fact that he was no longer affected by the quirk's effects. Back when they were younger, just a small taste of nitroglycerin would make Izuku dizzy with a migraine, and sometimes, if he exaggerated he'd faint. Now, after all these years, he'd developed a resistance; he could enjoy himself for much longer.«Aah, Kacchan-» Izuku's mouth traveled the exposed skin, wet trails of saliva left in its wake as he moved toward the center of Katsuki's chest. The heart beneath his lips thudding strong- «you're so perfect...»Hands gliding along the blond's sides, feeling up every curve, every dip of muscle under his fingers, Izuku's tongue lavished delicious pink nipples in nips and bites, sucking on the nubs harshly when he noticed the hitch in Katsuki's breathing. Quiet sighs falling from kiss-swollen lips and torso inching upward, seeking more of that sensation. Izuku was happy to oblige. He loved the other's ample chest after all, and what a better way to cherish it than press both pecs together and rutting his freed half-formed erection between them. He could cum from just that, yet tonight he had come up with this plan so they could finally, finally go all the way.Izuku discarded his underwear, now fully hard. He grabbed the lube bottle from the nightstand and scooted backward on the bed, taking Katsuki's bottoms off as he went, sweatpants and boxers both. The sight of his childhood friend, splayed out on the mattress, naked and waiting for him, was mouthwatering. A blush of excitement colored Izuku's cheeks: he was going to take him. The fire of desire and love burned in his veins.Katsuki was going to be his and his alone.Izuku wasted no time in diving in; there would be time later to take things at a leisurely pace, since the drug would last all night, but right now he had to be inside Katsuki as soon as he could.Pillow under the blond's lower back and strong legs parted, Izuku settled himself in-between his knees, hands running up and down muscled thighs. «How bad d'ja want it, Kacchan?» he asked, smiling. «Real bad, huh? Me too...»Gleaming green eyes alternated between looking at Katsuki's face, slowly flushing; his chest, rising and falling in an increasing tempo; his cock, filling out in response to the ripples of sensations; and his hole, puckered and twitching. Firm grip on Katsuki's knees, Izuku guided them down toward his chest, the mesmerizing view of the blond's entrance beckoning him; he descended on tonight's prize as a starved man would, the flat of his tongue dragging along the crack, the tip skimming lightly the inner walls. Izuku's nose brushing the tight sac just above, sugar and musk mixing into an intoxicating fragrance which was uniquely Katsuki.«God… K-Kacchan, can I? Please, please can I fuck you? Mnnh!» Izuku mumbled into sweaty skin, groin searching for friction against the sheets. «I can, right? You wanna, right?»Lubed up fingers circled and teased Katsuki's hole. It was sloppier than he would've liked, but Izuku's grip on self-control was slipping. Two fingers turned into three within a couple of minutes, fumbling for the blond's prostate as he jabbed and scissored them, garbled mewls escaping Katsuki in airy notes as he squirmed on the mattress. Izuku's slick cock pressed forward, easing inside his childhood friend a centimeter at a time. A low, gritty groan rumbled in his chest when he bottomed out; a whirlwind of emotions roaring in him.This was it.This was his place.With Katsuki. Inside Katsuki.It was perfection, it was everything he'd ever wanted: a physical manifestation of his undying love for Katsuki.«Kac— ah!— chan! So warm, so tight!»Izuku moved, hips snapping back and forth in a brutal pace. Too lost to the feeling of finally being one with his most important person to be careful quite yet. Fingers groped slim sides and corded thighs, nails leaving half-moons on pale skin; teeth sinking into engorged nipples till he tasted blood, which he lapped up greedily; eyes fighting the urge to close, determined to take stock of every little twitch on Katsuki's reddened face, from the pinched eyebrows to the slack jaws and the thin trail of drool along a cheek.«Fuck! Oh, Kacchan— ngh shit!— you l-like this eh?» He was ranting, voice thankfully muffled into the body rocking beneath him. «Feel s-so go-good...! Ah! Gonna cum— fuuh! ahh!— soon, can-can I? Oh God I'm gonna—»Izuku choked on a moan while his hips gave one last thrust, burying his throbbing cock to the hilt and cumming inside Katsuki, hot spurts of seed filling the blond.Coming down from his high, Izuku peeled himself off of his childhood friend's chest. He noticed how Katsuki was still hard. A grin spread on his mouth—it was going to take some time before he was ready to go again, so why not take advantage of the situation?Pulling out of the blond, Izuku grabbed the lube and proceeded to stretch his own ass: time to sit on that cock.Izuku sighed, nursing a cup of steaming tea while he sat at the same table he did yesterday, once again listening to Uraraka and Iida chat. He was tired; the bags under his eyes attested to that and, though he'd told his friends it was because he'd stayed up late studying, the truth was much less innocent and wholesome. It was wretched, perverted, blissfully naughty. It'd been one of the best nights of his life.It was during a lull in the group's conversation, that he saw Katsuki come into view.And what a magnificent sight it was.The look of sheer panic etched onto the blond's face—hair awry; wide, shell-shocked red eyes flitting about; haggard-looking cheeks; bitten raw lips; tense shoulders in a wrinkled button up shirt and a crooked tie—and the visible limp to his steps, when he walked into the common room, all hit Izuku so bad, he had to excuse himself from the table to rush to the restroom and take care of the massive boner that popped up. That's such an amazing look on Kacchan! he thought, cock in hand as he furiously stroked and thrust into his fist, flashes of the previous night behind his eyelids. G-gotta do it again sometime soon!