A/N: Wrote this one all the way back in March of this year; didn't realise I'd held onto his fic for so long. The reserve list must be getting cobwebs on it at this rate...

Regardless, I recall fondly writing this fic, and so I hope you enjoy it as well~

Useful

It was dark in Kivotos, the moon steadily rising into the abyssal sky that twinkled with a thousand and one stars, the faint ripples of the sky passing over the dome-like barrier that encircled Kivotos every now and again.

With the towering skyscraper that was Schale, however, Sensei offered little appreciation for the distant skyworks, his eyes squinting past the strain that ached at them as he scoured his computer screen, absorbing every bit of information about a troublesome student's behaviour before closing the tab and opening another, his fingers tapping rapidly across the keys inputting his thoughts about what their punishment should be.

For hours now that had been all he was doing – going over bad student reports, suggesting punishments or arranging for one-on-one meetings with them to help correct their behaviour... it was exhausting, all things said. He kept at it out of some stubborn determination to get all of his work done before bed but one glance at the clock in the bottom-right corner of his screen told him he was steadily failing at that; making less and less progress with every hour as his fatigue took its toll on his mental facilities.

Thus, with a resigned sigh he pushed himself back from his desk slightly, reclining into his cheap office chair and just staring at the ceiling. The dimmer light was a welcome reprieve from the blinding glow of his monitor and he knew if Yuuka was around she'd chastise him for working in the dark, but he couldn't be bothered to turn the light on. Plus, he had some students staying with him in the residential wing due to some classes he'd be teaching them tomorrow morning, so keeping the light on would just invite attention.

''...haah...'' He sighed. He didn't want to leave his office yet, but he also didn't want to keep working any longer – he was getting diminishing returns the longer he wrote.

After a second he pulled out his phone, hoping to find something to distract himself. He flicked through some messages but didn't answer any of them, not in the mood for conversation, and eventually he found himself scrolling through the gallery app on his phone. It was host to all the sorts of pictures one might expect him to have; commemorative photographs, selfies with his students, picturesque landscapes he saw during his travels...

...and risqué photos of his students.

Sensei stopped as he reached that one, warmth creeping up his cheeks but unable to look away. It was of Serina in a tight-fitting pink nurse outfit, a warm smile on her lips and her eyes half-lidded... and with her dress unbuttoned down the front. Her bra was missing and left the sides of her smallish but well-defined breasts bare and her free hand was digging into her white pantyhose, pushing it and her cutesy pink panties down enough to give him a look at her pussy, posing for the camera.

He swallowed, looking about. His office was so dark it was hard to see, not helped by the glaring light of his computer monitor, but he didn't notice anyone waiting just outside the door. Gulping he pulled himself into the table more and conscious dimmed the light of his monitor to a more tolerable level, allowing him to recline into his chair and quickly undo his belt. The rattle of it sounded painfully loud but he continued anyway, his breathing starting to quicken with excitement as he fought with clothes – and soon got them off, his pants shoved down to his thighs along with his boxers, allowing his slowly-hardening cock out.

''...fuck, doing it here...'' He breathed, groaning under his breath as he caressed his cock.

He changed the picture. This time it showed Yuuka in her gym clothes, the picture snapped by Noa when the former was getting changed. Her white top was on the bench next to her and her bra-clad chest was emphasised by her arched back, the dark purple lace standing out compared to the tiled walls behind her. The tight-fitting blue bloomers though truly took the cake, and emphasised her 'cake' too; her curvy ass on full display with her arched posture and her creamy thighs taut as she stretched.

His hand moved along his cock more steadily. What he wouldn't give to be in that room at that moment, to pull her bloomers down, bend her over and pound her until his balls were empty. It just wasn't fair how hot his students were. Shuddering at the thought he swiped right onto the next picture, this one of Noa herself... completely naked. Her phone must've been set on a timer of sorts because she stood facing the camera with both hands behind her back, one knee slightly bent and her head tilted to the side, her tongue out with a silly wink to encapsulated her cutesy look. However the lack of any clothes, even underwear, made it impossible to think of her as anything other than fuckable in that moment.

He groaned, his hand pumping along his cock rapidly. Those full, plump breasts that hung forth slightly, no bra to keep them contained. Those slender sides that led into a pair of wider, enticing hips, and those thighs that he wouldn't mind having around his head as he ate her out. Hell he wouldn't mind if she just stripped naked and stood in front of him, allowing him to jerk off to the sight of her nude self.

He groaned. ''Fuck, you're all so hot...''

It was then, as he uttered the words, that he heard a quiet inhale of breath – jerking his gaze over towards the door where a face peered in at him.

X-x-X

Haruka wasn't ready for bed.

Staying at Schale probably had something to do about that. She was used to sleeping in dingy conditions or even on the streets, as was the rest of Problem Solver 68, but the pristine cleanliness of Schale felt undeserving of someone as filthy and pitiful as her. The others didn't share the same sentiment of course, but she struggled to accept their arguments on the best of days.

Naturally though with how late it was the others all soon went to bed. Aru had clocked out almost immediately and Kayoko had dozed off after playing on her phone to a bit, leaving just her and Mutsuki awake – but eventually even the prankster went to bed, citing that she'd need her energy for teasing Sensei the next morning when classes began. It was that mention of Sensei, and her inability to sleep yet, that coaxed her out of the residential wing.

A few others were still milling about in the common area but thankfully none noticed her, too engrossed in the movie they were watching to see her pitiful form slink in the shadows and up the stairs two floors up where Sensei's office laid. It was much spookier up there, the hallways dark and unlit, with it all forming a single T-shaped corridor with a couple of supply rooms hugging the shaft of the 'T', whilst the top of it was a row of opaque windows that displayed Sensei's office on the other side.

Nearing the windows she could make out the dim glow of his computer screen, assured her he was likely still inside, so she made her way down the right-hand wing as quietly as she could and nudged the door open, doing it quietly as to not disturb him if he was busy. However the moment she creaked the door open she noticed something amiss.

Grunting.

Confusion filled her at first. Understanding dawned next. Then embarrassment took root as she realised why he was grunting, his breathing husky and lustful comments uttered under his breath. She peeked around the door more then, her dark hair helping blend her in with the shadows, and she couldn't help but just stare at the man who she'd come to idolise as he sat in his chair and jerked off to something on his phone. She wondered what it was – nudes of students? General porn? Maybe something more intimate?

Maybe... her?

She immediately quenched the possibility, almost wanting to physically hit herself. She'd barely sent much in the way of photos to Sensei – she wasn't photogenic in her opinion – and she doubted he'd get off to her even if she did. She wasn't as pretty as Aru or as charming as that Noa girl that worked at Schale often. No, it was probably them he was getting off to.

Yet even with that conscious realisation, it did little to dim the heat between her legs, a spark of arousal wriggling around in her groin.

And it was then that she heard him spoke. ''Fuck, you're all so hot...''

She sucked in a breath, realising he was looking at students – and then froze as his eyes darted over to her.

...

''Haruka?'' Sensei called out.

The aforementioned student swallowed the lump in her throat and shuffled into view, shutting the door behind her. ''Y-Yes, Sensei?''

''...how long were you watching?''

''A-A minute or two...?''

Another long pause, one that made her cringe in near-physical pain, before his sigh broke the quiet. ''I see. Just... don't tell anyone and go to bed, Haruka. We've got classes in the morning anyway.''

Haruka swallowed, half-tempted to agree just so she could get out of this situation... but the fire in her loins begged to be sated. Plus, they were the only ones up on this floor and nobody would come around to bother him, right? So if anything... this might be a rare chance to make herself useful.

''U-Um, Sensei... w-what about if I...''

With a gulp, Haruka lifted her skirt up, showing him her simple black panties. ''...h-help you out...?''

Sensei stiffened, in more ways than one. ''You don't have to go that far Haruka...''

''...am I not attractive enough...?''

''That's not the reason.'' He answered even as the fog of lust returned to his mind, the dim light doing little to hide her underwear from view, how the dark fabric contrasted with her creamy, slim thighs. ''But I suppose if you're up for it, then... sure. Come here.''

Haruka's timid expression brightened somewhat and she uttered a hasty agreement, hurrying over to his side. Sensei shuddered and turned his phone off, hurriedly pushing it to one side and allowing him to devote his full attention to Haruka herself. The moment he laid eyes upon her she pulled her skirt up once more, face red but her grip unwavering. From close up he could admire all the littler details he'd initially overlooked, such as the faint outline of her nether lips against the fabric, tempting him to pinch the waistband and tug her panties up a bit, making her cameltoe a little more prominent.

Haruka shivered, utterly submissive to him as he slowly stroked his cock with his right hand whilst his left reached down and rubbed her pussy through her panties, his mere touch making her flinch a little and whimper – her crippling shyness warring with her evident want. So enamoured by the sight was he that he soon hooked his fingers into her panties and pulled them down and out, enough that they slid down just a tiny bit and let him look at her pussy; folds puffy and a small patch of dark hair topping her sex.

''S-Sensei...'' Haruka breathed out, shivering.

However he didn't stop, too caught up in his lust now to simply do so. He burned the sight of her pussy into his memory and pumped his cock a little slower; gropes and squeezes interspersing his motions in lieu of strokes to slow him down, to not rush himself to climax. At last he released her panties and let them slap back against her groin, the material dishevelled but still on her hips.

''Get on your knees.'' He ordered her under his breath. ''You know what to do.''

''U-Um... right.'' Her shaky response made it clear she didn't.

Nonetheless Haruka got on her knees next to him, prompting him to swivel his chair around to face her. He pushed his pants and boxers down all the way to his ankles and coaxed the shy student between his legs more, one hand on the back of her head and coaxing her into his crotch, nose brushing against the shaft. She sniffed a little, inhaling his scent and whimpering, her eyes half-lidded as she stared up at him so submissively, yet with such obvious want – a want to please, and a want to be satisfied. A want, that Sensei was willing to oblige.

''Suck it.'' Sensei ordered under his breath, pulling her in.

Haruka whimpered meekly and complied, shuffling in a little more before parting her lips around the tip – and Sensei groaned through gritted teeth as she took him into her mouth. The way her lips encircled just under the head and dragged up to the tip felt downright heavenly despite her obvious inexperience, tempting him to gently push her head down a bit more. Haruka complied shyly, her lips sliding further down until just over two-thirds of his manhood was in her mouth, her lips pursing snugly around it as she sucked back up to the tip.

Hissing out a gentle encouragement Sensei let her do the moving, her head pulling back until it bumped against his palm before seamlessly plunging down as deep as she could go. The wet warmth of her mouth felt inviting but the seductive heat at the back of her throat was even more so, encouraging Sensei to nudge her down little by little until she was nearly throating him, her nose brushing against his groin.

''Mmk, mmph...'' Haruka's eyes watered a little as the tip hit the back of her throat.

Yet before he could so much as utter a word the cripplingly-shy student deep-throated him. It was so sudden, so intense, that he very nearly came then and then. He was saved from his imminent climax as Haruka pulled back almost immediately, gagging and coughing, but with a sudden burst of lust he grabbed her head and shoved her back down onto his cock. A small part of him immediately felt guilty for using her mouth so shamelessly, but his cock was already throbbing and his balls ached for a true release.

''Hah, fuck, Haruka...!'' Sensei gritted out, panting heavily. ''Gonna cum so don't you dare stop...!''

''M-Mmphm!'' Haruka made a general agreement, one muffled by the cock hitting the back of her throat.

However the fact she continued throating him got the message across well enough, forcing a moan of pure pleasure from Sensei's lips as he kept one hand on the back of her head, coaxing her down into his crotch repeatedly. Those slim lips of hers pursed around the base of his cock and sucked extra hard before she went back up to the tip, her sucks turning into sloppy slurps as her saliva drooled down his shaft only to be smeared in by her lips.

He tried to hold on, he really did. But when the room around him was pitch-black and the only thing he could really focus on was his submissive student giving him head, whilst her friends were sleeping two floors below... it was too much. Fiery need swept up his cock and he held her head with both hands – before with a tight, rasping gasp he shoved her down all the way, going down her throat.

''Mmgk?!'' Haruka's eyes bulged wide, her throat convulsing around the tip of his dick as he unloaded thick, gushing ropes of semen straight down it.

Hurriedly she swallowed lest she choked on his load but the tide seemed unending; every throb of his cock preluding the next thick load he poured down her obedient gullet. The air in her lungs began to thin and eyelids felt heavy, threatening to close against her will-

-until at last he nudged her back, allowing Haruka to gasp in a deep, much-needed breath.

''Haah! H-Ha- ack! Guh...'' Haruka coughed into her elbow, blinking away the reflexive tears in her eyes. ''D-Did I do good, Sensei...?''

''Amazing.'' Was all he breathed back, his cock sticky with her spit and gleaming in the dim light – but his lust burned ever hotter despite that.

How could he be satisfied with just a blowjob anyway? Especially after he'd gotten a blatant peek into her underwear and saw the real 'prize'.

''Haruka.'' Sensei breathed out, pushing his chair back. ''Lay down on the desk for me.''

''H-Hai...''

The dark-haired student blushed scarlet and mumbled an agreement, hurriedly stumbling back to her feet. By the time she'd done so Sensei had moved his computer monitor to one side along with any and all paperwork. The free space was immediately put to good use as he grabbed Haruka's shoulders and pulled her in front of him, nudging her back against the desk until Haruka climbed onto it, her breathing hard and fast scarlet as she laid herself back onto his desk. It wasn't long enough that she could lay easily, her head hanging over the edge somewhat, but if she disliked it she didn't say anything.

With a small, trembling sort of grin Haruka hiked her skirt up once more and lifted her hips up off of the desk, allowing him to easily pull her black panties down and off of her feet, removing her footwear in the process. His gaze however wasn't on her feet, but on the slit between her legs; his lust burning bright once more as he got into position between them. Her limbs quaked on either side of him and her hands awkwardly remained on her skirt, not sure where to touch or hold.

That was fine with him though. Holding her hip in his left hand he guided his cock in with his right, rubbing the glistening-wet head along her slit, parting her folds somewhat and making Haruka quiver with anticipation, her whine equal parts cute and arousing. He teased her a little more, jerking his cock off and rubbing the tip against her pussy, feeling how wet she was already despite barely touching herself, if at all.

''S-Sensei...'' Haruka whimpered out. ''Please...''

Sensei complied, dragging his cock down her slit – and then at last penetrating her. Pleasure exploded through his loins as her walls clamped down on his intruding cock, the slick heat of her pussy so much more intense when he was so sensitive, only encouraging Sensei to push himself in even deeper – meeting only token resistance as he took her first time. Haruka whimpered and grabbed onto his shirt, prompting him to lean down and claim her lips in a hungry kiss, utterly melting Haruka's mind as she tentatively reciprocated.

It was self-evident which of them was the one in charge though; her motions slow and hesitant, allowing him to easily control the pace of the kiss and draw it out as long as he pleased. Eventually though he pulled back, their breathing heavy and quite audible in the quiet – before soon he started to move. He pulled his cock out until it was just the head inside of her before pushing back in, grunting against Haruka's lips as he met some resistance but managing to sink himself in up to the hilt, making her whimper from the fullness in her loins.

''Mn... nn... a-ah~''

Haruka's quivering moans rung out in the quiet, muted only when his lips met hers in another heated kiss. There was no romance or love to it but Sensei didn't care; he was balls-deep in one of his students and he was loving every second of it. She was so snug, so tight, that it was hard to even think straight. Her slender thighs pressed themselves against his hips and without thinking he pulled away from the kiss, both hands grasping her hips as he started to move in earnest.

''Mn~!'' Haruka screwed her eyes shut and tossed her head to one side, gasping in short, desperate breaths.

The sight was an erotic one, doubly so when he hiked her skirt up just so he could watch his cock slam between her puffy lips and into her tight tunnel, every impact of his groin against hers jerking her away slightly before he inevitably pulled her back towards him, groaning as he stuffed himself inside her. The desk itself rocked slightly from his constant thrusting but he hardly cared, merely adjusting his hold on Haruka every now and again and pulling her back towards him, stopping her from falling over the edge of the desk.

Sensei groaned and tipped his head back, shifting his hands down to her thighs and holding them tight, burying his cock into her. It was heavenly. The slick, snug squeeze, the way Haruka gasped and whimpered, how her knees pressed against his hips; he'd never thought fucking one of his students would be so exciting but now that he had started he didn't want to stop; some small part of his brain suggesting inviting some of the others up to his office for 'private lessons'. The risk of them not being as into it as Haruka, however, stalled such wants.

And if anything, just made Haruka the object of his lust – his sole outlet in Kivotos.

''Mn! You're squeezing me so tight...!''

Haruka moaned wordlessly back, her cheeks aflame and eyes unfocused as she lost herself in the pleasure – the raw clap of skin-on-skin echoing throughout his office. Her back steadily arched more and more and his dick twitched against the slick heat constricting it, her vagina coiling around his manhood and practically begging for him to bust inside of her. A thought that just made him pound Haruka all the more.

''H-Haah...! Here it comes Haruka...!''

''A-Ahh-?'' Haruka moaned back, a confused lilt to the sound.

Sensei however was too deep in his lust now to stop; pleasure swirling up his cock as he drove it inside of her, her pussy seeming to tighten at just the right moments to grant him maximum pleasure – when suddenly one thrust became too many, his dick pulsating within her-

-and then he peaked. His eyes widened and he clasped a hand over Haruka's mouth just as he came, slamming his cock up to the hilt inside of her and cumming within her pussy – intimately feeling her insides clamp tightly around his dick, the smothering squeeze draining his balls. Dimly he was aware of her own fluids soaking his groin as she orgasmed with him, her eyes rolling back momentarily from the force of her explosive climax, but all he truly felt was the searing, snug grip around his shaft.

Little by little the intense rush waned though and Sensei pursed his lips, staying still deep inside of her – before pulling out all at once. The tip slipped from her puffy, glistening-wet folds in an instant, his dick still erect and throbbing despite his orgasm; his lust not able to be quelled after experiencing such an amazing pussy.

''Ah... haah...'' Sensei panted, removing his hand from Haruka's mouth. ''You good?''

''Mm... mmhm...'' Haruka managed to mumble back, chest heaving with every deep breath she drew.

He stood there for a moment, the dim light of the room contrasted by the harsh glare of his computer monitor, the light sprawled over Haruka's bare stomach and groin – her skirt bunched up and crumped from how much it'd been gripped. Her pussy glistened in the faint light and he could see some of his cum slowly dribble out of her and onto the desk underneath, the sight getting his cock twitching for more.

Something he acted upon without a second thought, grabbing Haruka by her hips and flipping her over. The shotgunner grunted in surprise but was too out-of-breath to speak, still as submissive as before even as he got behind her, his cock-head dragging along her slit once, twice – and then she moaned as he pushed inside, cock sliding between her slick walls until it kissed her innermost parts, filling her narrow tunnel to the brim.

''Haah... dammit Haruka, you feel so good...'' Sensei groaned through gritted teeth; gripping her hips as he started to thrust.

''I-I'm happy- ah~!'' Haruka cried out as he bucked his hips suddenly, filling her.

It proved to just be the first of many more thrusts, his fingers sinking into her smooth hips as he kept plunging himself inside of her – his full length fitting between her puffy folds and his groin smacking up against her small, peachy behind; the fleshy smack echoing out before the next one followed less than a second later. Though he started at a slowish pace he quickly built up speed, the constant friction on his shaft reigniting his lust and hastening his movements until he was pounding her once more.

Bent over as he was he could admire her small behind as he stuffed her full, ripples spreading over her ass cheeks as he pinned her up against the desk. With a groan Sensei shifted his right hand up to her shoulder, keeping her down against the desk as he slid himself into her hot embrace, his dick fitting inside her like she was made for him – their union slick and sloppy as he stirred up the load of cum inside her, causing some of it to dribble out around his dick and spill out, like he was making room for the next load he was going to fill her with.

''Mn, ah, nn, oh, ahn~'' The stream of moans spilling from Haruka's lips only fed the fire within him – his dick twitching within her snug grip. ''S-Sensei, it feels s-so good~''

''Great.'' He managed to grunt back, puffing out breaths as he focused on fucking her.

Haruka wasn't very reactive, simply laying against his desk and letting him do all the work, but in that moment that was just fine with him. He didn't want a partner who's needs he had to attend to, he just wanted to get his dick wet and bust his nut – and Haruka happily served that purpose, her pussy squeezing him so blissfully it felt like he might cum at any moment, not least after two back-to-back orgasms. The thought of knocking up the shy and anxiety-riddled shotgunner just made him plunge between her petals more, enjoying how her loins practically tried to suck him back in.

Tingling pleasure quickly trembled up his shaft as he sped up, his breathing tight and harsh as he felt another orgasm creep through him. Time eluded him and the world beyond his desk blended into oblivion, only Haruka remaining in his focus, his shaft disappearing between her nether lips and coming out glistening with their mixed fluids. Soon his couldn't see his cock come out at all, pulling out only an inch or two at most as he savagely pounded her.

''Hah, almost...!'' Pleasure burned at the tip of his dick, begging for release.

And then he got it; gritting his teeth as he busted a fat nut inside of Haruka, a moan forcing itself up his throat as he emptied his balls within his tight student. Haruka spasmed under him, gasping into the hard surface of his desk and squeezing him tight, her own orgasm shaking through her lithe frame – but he got a second wind and managed to pound her for several hard seconds, forcing a cry out of Haruka that sounded so sweet he almost wanted to hear it more.

Alas his stamina ran dry and it was all he could do to slam balls-deep in her, hissing out a tight breath as he made sure all of his load ended up inside of her womanhood. Her inner walls conformed to the shape of his cock, helping milk him for every last spurt of cum he could pour inside of her.

Then at last he pulled out, groaning as he stumbled back a step and ultimately slumped down into his office chair – caught in a daze as he just admired Haruka's ass and pussy, watching a steady flow of cum dribble down her inner-thigh.

''Not bad, Haruka.'' Sensei puffed out. ''Keep this to yourself, and we can do this again in future.''

''H-Hai... Sensei...''

The hopeful anticipation in her voice, amusingly, was obvious.

[END]