A/N: Originally was planning on this just being a one-shot, but as I was writing I got the idea of Atsuko into my head, and so... yep, this'll be a 3-parter. Second chapter Atsuko-centric, then third chapter threesome. Not sure when I'll get around to the following chapters, but I'm aiming for November.

That aside, do enjoy some Saori lewdin'~

Tricked and Treated

Halloween's Eve was a busy time of the year for Sensei.

For one the numerous festivals, events, parties and whatnot were all in their final stages – and more than a few students had forgotten something, were running late, or had some last-minute cancellations that needed filling in. Naturally the many panicking students, running out of places to turn to, came to him.

Hence the large pile of paperwork on his desk. He tried to feel optimistic about it, knowing that Rin had given him the big day off to spend with his students, but even the promise of some good old trick-or-treating did little to elevate his mood.

Thus he was supremely happy when he got a call on his phone. Gladly pushing himself away from his desk Sensei whipped his phone out, his delight turning into surprise when he saw Saori's profile picture in the middle of his screen. It wasn't often the wayward member of Arius contacted him and when she did it was usually to ask a question or other, but given the season and timing, he had an inkling as to what it might be about.

Regardless he pressed the big green 'answer' button, causing the screen to go black – and then Saori's face showed up in the screen.

''Sensei.'' Saori greeted with her usual neutral tone, dipping her head in acknowledgement.

''Saori.'' He smiled, idly turning in his swivel chair. ''What's the occasion? Got another question?''

''Something like that.'' Saori conceded, looking off-screen, and if Sensei strained his hearing he swore he could hear Atsuko and Hiyori. ''Yes, I know... ahem, Sensei. What is Halloween?''

''...eh? You don't-'' He stopped himself and palmed at his face. ''Right, sorry, forgot you probably wouldn't know.''

''It wasn't celebrated back in Arius.'' Saori affirmed without inflection. ''We've noticed a lot of signs up lately though and the shopkeeper's answer didn't clear things up much... I think he was trying to get us to buy his stuff.''

Sensei nodded. ''Mm. In short, Halloween's all about dressing up in costumes, along with going around various homes and 'trick-or-treating' – basically telling a joke or doing a little trick and getting some candy in return. Some people also spend the night watching horror movies, eating pumpkin pie, the like.''

''I see...'' Saori hummed quietly – her eyes once again flickering right, and this time he definitely heard Atsuko say 'ask him'. ''...Sensei, could you show us how it's done?''

He hummed and rolled the idea around in his head. He didn't have anything planned per se, but he did admittedly have a fair few students who wanted to spend him with him... but, at the same time, this would be the Arius Squad's first Halloween, and it would be ideal to make it their best. At least then in the years to come he could be confident they'd know what to do.

''Sure.'' He answered with a smile. ''Come meet me outside of SCHALE at... say, seven o'clock in the evening. There's a fair few residential districts nearby; we can trick-or-treat there.''

Saori perked up. ''Is it okay?''

''Of course.'' He smiled reassuringly. ''Do you girls need help finding some costumes?''

''No, we can handle that much at least. Atsuko found a store nearby. Hence why I called. Mostly, anyway.'' Saori glanced aside, and this time it was out of embarrassment. ''...I am curious about Halloween as well.''

The sight of Saori gently blushing, even if through a screen, was endearing in ways that words failed to describe. ''I'll show you girls a good time; trust me, you'll love it.''

Saori smiled at that; a small but beautiful thing as she nodded along. ''Mm. We'll be in your care, Sensei.''

Then with a click, the call was disconnected – his plans for the following day now made.

X-x-X

Halloween itself was a big deal in Kivotos.

Mostly thanks to the various shopkeepers. Banners lined the streets, stores were decorated lavishes with spooky paraphernalia, and most of all plenty of candies were on sale for cheap. Chocolate bars, muffins, balls of chocolate wrapped in tinfoil, decorated faces or even just more traditional individually-wrapped candies; the variety was nigh-limitless.

Sensei admired the various decorations from his spot just outside of SCHALE, hands in his pockets. Thanks to Hibiki and her tailoring skills she'd made him a zombie-like costume; the tattered clothes fitting his size and simultaneously torn yet not showing off too much. The pants were full of slashes and coated in fake blood stains whilst his shirt was a tattered brown thing splattered with red splotches. Coupled with some grey make-up applied by Rin and he could pass off as a zombie... though he hoped nobody would be dumb enough to shoot at him. He plastered a 'SCHALE' print on the back of his shirt just to be on the safe side.

He was disturbed from his thoughts though by a familiar voice calling out to him – Atsuko. ''Sensei~''

Turning he found himself looking at the approaching forms of the Arius Squad. Atsuko led them, dressed in a white wedding dress with veil and all, joined by a rose bouquet and fake bloodstains all over her corset – a corpse bride. Hiyori, perhaps predictably, opted to wear a white sheet with holes cut into it for her arms, eyes and mouth; a classic ghost. Misaki went with a mummy costume, just wrapping most of her body in white bandages, hiding the white crop top and shorts she was wearing underneath.

Saori, however, was who caught his attention the most. She'd gone with a classic witch outfit, the black form-fitting dress splaying out at the skirt, the article of clothing reaching no further than her thighs. Black thigh-highs with spiderweb patterns hugged her long legs but he found his gaze travelling further up, unable to not notice how prominent her chest was with her dress pushing them up, her creamy cleavage distinct from her black witch dress. Her slender shoulders were bare, flesh exposed to the elements whilst her head was topped with a wide-brimmed witch hat, the purple-brown patchwork easy on the eyes.

''...Sensei?'' Saori tilted her head. ''Is something wrong?''

''Ah? No, nothing. Really cute outfits by the way.'' Sensei commented, smiling as he gestured. ''You all look lovely in them.''

''Heehee, thank you Sensei~'' Atsuko did a cute bow, and it took a conscious effort not to peek at her demure cleavage when she did so. ''Should we go now?''

''Mm, follow me-''

Atsuko was by his side in a heartbeat, her left arm around his right as she smiled mirthfully up at him.

Leaving Sensei unaware of Saori's slight, jealous frown.

…

As per his promise, Sensei took them around the nearby residential districts.

They were quite popular with trick-or-treaters due to the generous amount of candy all the old folks gave out, but due to the fact both Trinity and Gehenna were hosting large parties in their home districts the usual mob of students was far less extreme than it would be otherwise. Naturally the members of the Arius Squad were hesitant at first, but after several successful candy acquisitions, they were feeling much more confident about things. Saori even read up and rehearsed several jokes to use.

He wasn't sure whether that in and of itself was supposed to be a joke or not, but given her deadpan expression, he assumed not.

Nevertheless the night was progressing smoothly – something of a rarity in Kivotos, admittedly. It was nice to actually have things go his way without someone throwing a wrench in his plans or causing chaos that needed dealing with; he suspected Gehenna might be hosting all such chaos on this fabled night, given their tendencies for explosions.

''Sensei.'' A soft voice next to him lured his gaze to his left.

Saori peered back up at him, head tilted and witch hat tipped to one side. ''Is something on your mind?''

''Just savouring how quiet it is tonight.'' Sensei chuckled, glancing ahead as Atsuko pulled Hiyori and Misaki by their wrists, earnest in her desire for more sweets. ''Normally this section is a lot busier.''

''I see.'' Saori dipped her head, the pair of them taking a left and following after Atsuko as she led them down another side-street. ''Would you like some candy?''

Seeing no harm in it he obliged, accepting the tinfoil-wrapped chocolate and shedding the green foil, popping it into his mouth. It was hard but had a gooey centre, tasting vaguely of mint but with a stronger nippy taste, almost medicinal but in a pleasant way, reminding him fondly of flavoured cough syrups he took when he was younger. Saori herself also ate an identical chocolate, the pair of them munching away as they walked, no conversation needed as they just basked in the quiet charm of the night.

Or that was the plan. Quickly Sensei felt an odd stirring in his stomach; heat fanning out from his belly and to his loins. He ignored the feeling at first but soon began to wonder if the chocolate was spoiled, but food poisoning didn't take hold that quick – and a shudder roiled through him as he felt a peculiar stirring in his dick. Familiar as he was with himself he knew what it was and as such he discreetly adjusted his belt, feigning it as his pants coming down – and not him trying to hide his growing boner.

Saori's sudden gulp made him glance over at her. Her face was flushed and she pulled her hat further over her eyes, hiding her face from him, but he could still spy her lips as they pursed firmly together. Was she feeling the same way as him? If so, did that mean that the it was the chocolates that caused this?

His witch companion seemed to come to the same conclusion as he did. ''Sensei... I think something is wrong with these chocolates...''

''Yeah... I noticed.'' He answered tightly.

Saori was quiet for a second – but only a second. ''...is it poison?''

''...of a sorts.'' He vaguely answered. ''Might be an aphrodisiac.''

''I've never heard of that?'' Saori mumbled, her breathing audibly heavy. ''Sensei, I... I feel strange...''

She clutched onto his sleeve. ''...how do we purge it...?''

A shudder coursed through him. He knew. Goddammit did he know – but with Saori? With his student? Could he-?

''Sensei.'' The breathy intonation drew his eye – and he spied her cleavage, squishing in as she pressed it into his biceps. ''...please tell me you know how.''

He did.

And so with a hand on her arm he pulled her off into a nearby alleyway.

Up ahead Atsuko continued to drag Misaki and Hiyori, humming a sweet tune – until by chance Hiyori peeked back and blinked in surprise, finding two of their members abruptly absent. ''E-Eh? Where did they go...?''

Unseen by Misaki and Hiyori, Atsuko pouted.

…

The alleyway was long, narrow and entirely unlit.

Boxes and bins littered the sides, but most curiously was a small alcove into the wall of one building; just a foot or two deep with a sheet metal roof overhead, full of holes and rusted by the rain, but casting the area in shadow. Making it an ideal spot for Sensei in that moment.

''Mmph!''

His lips crashed against Saori's and the witch held onto his shoulders, a confused sort of groan escaping her as she pulled him in. He shuddered, some squirming inkling of doubt lingering in his heart even as he pressed Saori up against the wall, his hands dropping under her short dress and grabbing handfuls of her ass. God her figure was just divine; his fingers digging into her cheeks before tracing her ass up to her waist, admiring the curve of her rear even as his lips met hers in another passionate kiss.

''Mn, sorry, Saori...'' Sensei apologised as he drew back, his face mere inches from her own. ''I can't hold myself back...''

Saori's cheeks were flushed scarlet, though whether that was due to the aphrodisiac or her own feelings he didn't know. ''It's fine. I don't mind... especially if it's with you, Sensei.''

The demure admission sent a shudder roiling through him, his palms kneading her ass cheeks – when Saori reached down and palmed his crotch. He was painfully erect and no amount adjusting his pants would hide that fact, something Saori took advantage of; gripping his dick through his pants and tugging it. It was a meagre handjob but in his drugged state Sensei was left groaning in relief, his hips rocking and helping thrust himself into her hand.

Prompting Saori to grab his belt and undo it. It rattled as it fell apart and suddenly she dropped to her knees, pulling his boxers down with the motions and allowing his rock-hard cock to spring to full attention before her, looming over her blushing visage. It occurred to him then that this was likely her first time seeing a dick, both in real life and perhaps even in media, given her upbringing. Despite that fact Saori didn't stop to stare for more than a few moments before she wrapped her digits around his cock, slowly stroking it.

''Like this, right...?'' Saori mumbled.

''Yes.'' Sensei hissed, his cock throbbing in her palm. ''… you ever done anything like this before...?''

''No.'' His student admitted, her breath hot over his tip as she leaned in. ''But I remember watching a video a while ago... I'm supposed to suck it, right?''

Sensei breathed out an agreement, anticipation welling – and he was gratified by plump, pink lips that enveloped his swollen tip. Her tongue guided him further into her mouth, saliva dripping onto the top of his dick as her lips glided along his shaft, accepting just over half before she sensually sucked back up to the tip. A hum reverberated out from the back of her throat, a hint of need lacing her voice as she sunk back down, eyes fluttering shut.

Sensei looked left and right, peeking to make sure both ends of the alley were clear – but another suck coaxed his gaze back onto Saori herself, a groan expelled from his throat as his dick slid into her mouth. Her witch hat had fallen off but neither bothered to pick it up, his attention fully on his partner as she tilted her head, her saliva-coated tongue slithering along the side of his girth or curling a little around it, the sensation stealing the breath from his lungs. As did the sensation of her plump lips pressing into his erect shaft, sliding up to the tip before she swirled her tongue around it several times, teasing out a moan from him.

Then without pause Saori plunged back down, going deeper than before. His tip grazed the back of her throat and a pulse of pleasure shot up to his tip, his breath getting caught in his throat, but with a hum Saori kept sucking him off – bobbing from tip to near the base, her fingers digging into his hips as she propelled herself onto his cock. Spit dribbled down her chin and he he hear her grunt with every plunge but she didn't stop nor slow; devoting herself to giving him the most intense blowjob of his life.

''S-Shit, Saori...'' Sensei moaned out, grabbing her head with one hand and putting his other on the wall; leaning over her. ''You're damn good at this, keep going.''

A low moan answered him – and then the next thing he knew she was taking him in deeper. Inexperienced but earnest lips pressed into his manhood and slid down to the base, her nose in his groin as she deep-throated him. The unfathomable wet hotness at the back of her throat left him panting; right hand tugging on her hair as he pulled her into his crotch, pushing her down as if to somehow accept a little bit more of his dick.

Saori pulled back all the same, barely pausing for breath before plunging herself back down. His knees quaked, his breathing staggered, but the Arius girl kept throating him without any signs of slowing down – wet grunts bubbling up her throat as his dick plunged down it time and time again, her tongue left flat against the bottom of her mouth. Pressure built as her salacious mouth enveloped him, sucking him hard, making him tense and catching his breath in his throat-!

Until he came undone. Instinct took hold and he yanked Saori into his crotch, hissing through gritted teeth as he busted his load down her throat – the sharp stab of euphoria followed by a wave of pure relief as he rode out his knee-shaking orgasm, his balls tensing repeatedly and preluding the thick spurts he shot down her throat. She swallowed it all, holding onto his hips without protest, her; welcoming his load down her gullet.

A small eternity passed like that before Sensei regained his sensibilities, panting and shuddering as he stumbled back a half-step, his dick slipping out of her mouth. ''Holy shit, that... hah... haah...''

Yet the aphrodisiac refused to leave his system so easily. Even as he stood there panting his cock, tender and aching, throbbed back to full hardness – forcing a strained moan out of him. His dick felt tired but the drug in him refused to let him soften, leaving him simultaneously sore yet so damn horny he couldn't help bur gently knead his cock, panting as he did so.

''S-Sensei...''

Saori's demure call drew his eyes up to his student as she stood – and he froze as she bent over, cheeks aflame. Her black witch dress hiked up at the back to reveal more of her curvaceous ass, a pair of bundled-up black panties sliding down her thighs, prevented from falling any further when she shifted her heels further apart. He tried to look away but couldn't, his eyes drawn to her needy, weeping slit as she bent over a little further, her breathing hard and her gaze pleading.

''Please... stick it in here too...''

He shuddered violently, whatever shreds of self-restraint he had rapidly dissolving like wet paper. Without hesitation he closed the short distance between them and pressed his erect cock up against her ass, one hand guiding him down and drawing a groan from Saori, his bulging tip sliding along her slit once, twice, thrice – and then on the fourth go he finally claimed her. His tip dipped in easily but he met resistance as the shaft followed, his girth claiming Saori's first time but only earning a grunt from the busty witch, her pussy clamping tightly around his intruding girth.

''Saori.'' Sensei groaned out, voice tight. ''God you're so hot like this.''

''Sens- mm!'' A nibble to her earlobe made her moan, the noise quietened by her pursed lips but not muted entirely. ''Please, don't hold back, just do what you, hn, n-need to...!''

Sensei obliged. Planting his hands on the wall before her he buried himself in as deep as he could before drawing back, hissing as her slick vaginal walls clenched around his dick, the slippery vice that was her pussy threatening to make him bust so soon. Which perhaps contributed to him jolting his hips forwards and slamming into her with more force than needed – but the sharp gasp he fucked from Saori's lips made it worth it.

Releasing a laboured groan he pushed his face into her shoulder, inhaling her scent. His thrusts built momentum but he didn't rush it, telling himself to take it easy, but damn if it wasn't an impossible task – his hips jerking forth harder and faster with every moment, his lust commanding him to do so. His hands, too, couldn't just stay flush against the concrete wall and gravitated down to her dress, pulling it down and freeing her large breasts, no bra to cover those beautiful tits and enticing him to grope them.

''Mn...! Sensei...!''

She pushed her ass back into his crotch, asking for it. Growling back Sensei complied and put more force into things, foregoing any semblance of care and just focusing on stuffing his cock into her tight, receptive pussy – fucking strangled little moans out of his partner, her palm over her mouth to stifle them. But he could still hear them clear as day, the noises burning themselves into his memory even as he hilted in her drooling vice, his dick sliding between her petals with every thrust yet never satisfying the burning lust within him.

''Shit, ohh shit...'' He cursed breathlessly. ''You look so hot in this dress you know?''

''Mn, really?''

He kissed her nape. ''D-Definitely. When you bend over it really shows your ass and, hng, you look so cute yet so fuckable I can't hold myself back...!''

Saori reached back, one arm wrapping around his nape and allowing her to look back at him. ''Then don't... just, enjoy yourself, S-Sensei...!''

The noise that came out of his throat was neither a growl nor a groan, but some strangled mess between – right before he darted in and mashed his lips against Saori's own. His cock throbbed within her tight, formerly-virgin tunnel, scraping her sopping insides and kissing her cervix with the promise of a creampie. As if responding to the promise Saori tightened around him, her moans taking on a whinier pitch so unlike her, her body tensing as she shoved herself back against his own, her movements hurried and clumsy.

She was close, he realised, and dammit so was he. Pulling out wasn't an option in his mind, his cock aching so wonderfully when snared by her sopping insides, every tight squeeze or clench threatening to push him over the edge. Pre-cum wept form his tip and he smeared it against her innermost parts with every desperate thrust, dimly aware that their flesh was slapping together, his groin colliding with her ass cheeks as they went at it like animals.

''Crap, Saori, here it-!''

He spoke not a word further before he busted inside of his dear student, tip kissing her cervix and delivering the promised load into her womb. Saori buckled, a sharp, startled cry escaping her before she slapped a hand over her mouth, moaning sharply into it as she slouched against the wall. The sight just drove him wilder, gaining some semblance of strength as he kept thrusting, going balls-deep in Saori for several more thrusts, pouring his semen into her willing baby chamber.

He pulled away, head tipped back as he panted raggedly, his thrusts slowing before halting altogether. He pursed his lips, gritted his teeth, then groaned through them as he finally pulled out – the night air cold compared to the hotness of her pussy. Cum was quick to spill out Saori and his student probed at her sex with two fingers, shuddering as she ran her digits over her clit and spread her folds, dipping her middle finger inside of herself a couple of times.

Then she stopped and stumbled back to her full height, putting her back to the wall. Panting she faced him, her face flushed scarlet and her tits still free from her dress, rising and falling with her breaths. She noticed his gaze on them and glanced aside, flustered... before lifting the front of her dress.

''...again...'' Was all she said.

And all that needed to be said. Sensei closed the distance and mashed his lips against her own, muffling Saori's moan as she wound her arms around his nape, pulling him deeper into the kiss. At the same time Sensei grabbed onto her plush rear and lifted her up; bouncing her a couple of times in his hold before letting her lean back against the wall behind her – their kiss quick to end so he could look down between their bodies, his right hand guiding his cock in.

Then he was back in bliss. With how soaked she was he sunk in deep practically on the first thrust, his subsequent groan muted when Saori pulled him into a kiss. He deepened it; pressing his lover into the wall as he started to thrust, pumping himself into her quivering loins and stirring up the cum he'd spilled within her, eliciting a muffled whine from his partner.

''Hng, the poison only seems to go away, when you're moving...'' Saori panted against his lips. ''So please don't stop...''

Sensei didn't bother to correct her – for all intents and purposes the aphrodisiac was a poison, insofar as that they needed to 'purge' it. Banishing such thoughts he reclaimed her lips in a hungry kiss, unable to get enough of the simple act – let alone how fantastic it felt to go balls-deep in his student, grunts and groans rising out of his throat as he buried himself between her petals, his girth sheathed deep within Saori.

Much to her delight. Though her bashfulness remained moans still spilled past her lips all the same – when they weren't mashing against his own, that is. Each kiss left him breathless bur he couldn't stop, the aphrodisiac in his system leaving him mad for Saori. His fingers dug into her ass, feeling up the attractive curve even as he pulled her lower half towards him, jamming his dick into her quicker. The slippery friction just drove him wild, pleasure pulsing up his shaft and leaving him craving it even more.

''Yes, more...'' Saori puffed out, forehead pressing against his own. ''It's happening again...!''

A surge of excitement rushed through him and he mashed his lips against her own, devouring her orgasmic moan as he hammered her into the wall. Their loins collided rapidly; a slew of slick squelches echoing out until he slowed – only to lift her legs up and press them into her chest, growling as he pressed Saori into the wall. Her moans turned into gasps, her loins seized lovingly around his girth and encouraged him to pound her sopping core raw, his body crashing into hers with a desperation born from overwhelming need.

Saori cried out in delight at that, stifled only partially by a quick, clumsy kiss. He broke it off to bury his face into her neck, kissing it blindly and inhaling her scent before working his way back up to her lips, reclaiming them and drowning her moan with his own. He rapidly lost his grip on his self-restraint, his cock throbbing with such primal need as it kissed her innermost parts, the threat of a climax too prominent to hold back.

'Crap, can't-!'

Saori clutched at his cheeks, pulled him in – and just as they kissed Sensei busted his load inside of her. Her hands scrambled, clutching onto his chest and convulsing between him and the wall, her tightening hole squeezing him for his seed even as she orgasmed with him, her thighs pressing into his sides and her heels locking behind his ass, refusing to let him pull out even if he wanted to.

''Hnf... Saori...'' Sensei groaned against her lips.

Saori just responded by holding onto him tighter. She still wanted more.

And so did he.

Thus did he start moving once more, their moans locked between mashing lips – unaware of the three voyeurs around the edge of the alleyway, spying on them as they went at it like animals.

Hiyori fainted at the lewd sight.

Misaki took her phone out and unashamedly filmed it.

And Atsuko... Atsuko shuddered, a needy want between her legs.

One only Sensei could satisfy.

[END]