Archive of Our Own ^beta

The questionable name of the heist target in question, the Sinner’s Apple, was admittedly probably Kaito’s first indication that stealing the gem for tonight’s heist was Not a Good IdeaTM.

The second indication was the raunchy and scandalous history behind the gem. The Sinner’s Apple has infamously passed through hands for over three hundred years of well documented, and some fabricated, history. Secret affairs, broken marriages, political pairings and sex cults, you name it, this gem’s been through it. The previous owners of the gem were all said to be the most desirable suitors of their generations, modern-day Helens of Troy, and have all been relentlessly pursued by a parade of crazed suitors. It had since been traded between wealthy families who knew how to keep their scandals on the hush hush in private collections, finally resurfacing at the exhibit of Vespanian Crown Jewels currently being held at the Tōto Tower.

The third indication there was something awry was the fact that once Kaito had gotten his hands on the jewel, the owner didn’t stick around long enough for him to return it to the exhibit. Instead, the Duke of Vespania fled the country, leaving only a secretary for diplomatic duties and a vague voice note that ‘KID could keep the damned jewel if he so wished.’

The Sinner’s Apple was a deep, pinkish red ruby, glittering with an internal fire rivalling that of the most brilliant diamonds. It was cut in a royal round cut, set into an opulent gold brooch and ringed by a necklace of accent diamond stones. It was also currently lying on the floor of the Kudou Mansion library, as the Phantom Thief pinned down the squirming form of Shinichi Kudou beneath him over the wooden desk, scattering cups of pens and leaves of paper all over the floor.

“KID,” the detective gasped, trying in vain to throw the other teenager off. “What are you doing? I haven’t seen you in weeks since your last heist-”

“Tantei-kun,” Kaito moaned balefully into the other’s collarbones, nuzzling and greedy for his detective’s skin. “I really screwed up big this time.”

“What-” he gasped. Kaito delighted in the reaction as the quick prick of his teeth when he bit down over the taper of bone caused Shinichi to arch forward, stuttering his movements in trying to shove Kaito’s questing mouth away from himself. “What do you mean? What’s wrong with you? You’re burning up.”

Kaito ground his hips against the Detective’s, delighting in the squeaked reaction he got in return as the unmistakable hard tent in his pants rode up the other teenager’s thigh. 

“‘M cursed,” he said in a way of explanation, shoving his hand between the two to palm at the front of his slacks. Shinichi openly stared at the movement, eyes following Kaito’s hand with restrained excitement.

“The last heist target - Akako said it was a bad idea, I didn’t listen - the Sinner’s Apple, is a cursed jewel that turns anyone who takes it without permission into a demon.”

“Seriously? For real?” 

Kaito nodded, biting back a groan as the beginnings of arousal started to fog up his brain with the friction of his pants against his cock and a tempting, writhing body directly beneath him, exuding all sorts of interested, if slightly confused, energies- No, he needed Shinichi to understand what was happening, why it was happening. How to make it better. 

“And when Lilith did not submit to Adam, she tempted him with the allure of her flesh, taking the Apple of the Garden into her bosom and she offered it. For her transgressions, Lilith was banished from the Garden and became the wife of Lucifer and the mother of all demons, the first Succubus,” Kaito recited, eyes glowing red with demonic power to dispel any lingering doubts Shinichi might have had over the existence of magic and demons.

He let his tongue split into a fork and flick out, growing out his ram’s horns poking through the hair on his head and tipping off his hat which bounced and rolled away on the ground. He was serious about this demon stuff.

Shinichi’s eyes widened with incredulousness. “You’ve turned into a succubus?!”

Kaito nodded. “An incubus, technically speaking,” he said. 

Shinichi rolled his eyes, as if the technicalities mattered at all in a situation like this!

“Is there any way to break the curse?” Shinichi asked, trying desperately to distract himself from Kaito’s incessant grinding of his hardness against Shinichi’s clothed backside. 

“I tried. I tried to look for a cure on my own for so long,” Kaito lamented, drawing out the ‘long’ in a whine that snaked and twisted its way around Shinichi’s brain as Kaito subconsciously worked his newfound demonic powers of want, need, desire, melting Shinichi’s higher functions into a gooey mulch. “It was why I couldn’t hold any more heists. I had to stay away, or everyone would be in danger.”

“Danger? How could anyone be in danger, you’re KID-”

“But I couldn’t take it any more, Shinichi. I’m starving. ” Kaito whined, emphasising his point with a sensual grind of his hips, eliciting a yelp. “I’ve tried everything , but I can’t wait any longer. Not even chocolate can make me feel full. I feel like I haven’t eaten anything in weeks.”

Shinichi’s eyes widened, as he felt the beginnings of his strength seem to leech from his limbs from any skin to skin contact he had with the wanton thief. 

“Legends have it that succubi and incubi feed off of sexual energy during intercourse,” he realised, despite everything and deducing the root cause of Kaito’s misery and unusual behaviour. “You need sex to feed.”

Kaito nodded miserably. “I tried to deny it at first, but look at me, I’m falling apart.” He leaned back a fraction, allowing himself to part from the sweet, sweet energies wisping off Shinichi’s skin long enough for the detective to understand what he was referring to.

Shinichi looked, really looked. He saw that despite his newfound demonic attributes, Kaito was a bit of a mess. His skin was ashen, his lips were pale and dry, his horns were cracked, his slitted pupil eyes were dull, the fork of his tongue was tinged in an unhealthy looking black. 

Kaito had started out that month post heist as a vibrant, virile and energetic - if only slightly hornier than usual - demon who refused to sleep for several days in a tireless search for a cure. However, the search had taken its toll for every day that passed that Kaito didn’t feed. He started sensing the energies of everyone around him at school. The couples with raging teenage hormones that wanted nothing more than to spend each break exploring each other’s mouths, trying out new sensations and discovering new things about their bodies. All that pent up sexual energy so close, yet so unreachable. As much of a ladies man as he was, Kaito had only wanted to share those things with one person; his favourite lookalike, adorable critic. And the longer he’d had to endure his newfound condition, the more tempting it got to just snap and ambush Shinichi at his house. When the hunger pangs had begun to become unbearable. He found he could pick out Shinichi’s lingering scent on the train line leading to Beika. He could stalk Shinichi’s every move following that aroma. It sang, clear and irresistible to his blood, beckoning him forth until Kaito had followed it to the Kudou residence, peering inside and seeing his favourite detective pouring over case files over the kitchen counter, a cup of vanilla infused coffee blend in hand that added to the aromatics like a dollop of vanilla cream over Shinichi’s signature scent.

Kaito had resisted back then, but tonight it had gotten so bad . He was just so hungry, Kaito had donned his Thief’s outfit and single mindedly followed that sweet scent into the walls of the Kudou household until he found himself in their current situation. He was starving, and Shinichi was the buffet laid before him. Maybe he could just have a little taste. Feast on that delectable energy Shinichi was giving off, just enough so he could gather his strength to continue searching for a cure-

“You idiot, how bad is it? What have you tried? Don’t tell me you’ve just let yourself starve for twenty-eight days straight!” 

Kaito could only offer his mournful puppy eyes in response, nuzzling his face all up the Detective’s front apologetically like he could devour the low buzz of interested energy Shinichi was giving off that way.

“Dumbass!” Shinichi scolded, briefly stopping his attempts to throw Kaito off long enough to lightly thwack him on the back of the head.

“Won’t you let me have a taste? Just a little taste. Maybe just a kiss will be enough?” Kaito begged, his hands scrabbling at Shinichi’s collar, eager to expose more of that delectable skin that tasted so, so sweet against his tongue.

“If I could eat, even just a little, I’ll be able to find another cure-”

“Wait,” Shinichi interrupted, hands catching Kaito’s clawing fingers as he whined in protest as he was denied from unwrapping more skin from his sweet, sweet detective.

“What do you mean, ‘another’ cure? Do you already have something?”

“Yeah, but who cares about that right now? I’m starving~ ” Kaito whined, pawing at the front of his slacks. “And you’re willing. I can tell, I can taste it in the air-”

“Then starve,” Shinichi said mercilessly, awkwardly adjusting himself in his pants, willing his hardening erection away. He needed to think with his head right now, Kaito needed him to be the brains of this operation for the both of them or nothing would get done. KID was too busy thinking with his cock- er stomach. Both. Probably both. 

“You don’t get one drop from me until you let me know how I can fix you.”

Kaito groaned and banged his fists petulantly on Shinichi’s chest. He was being so mean! He needed to do something to get Shinichi to drop it and just get this show on the road already. It was cruel, too cruel! He was quite literally wasting away in front of his boyfriend’s eyes and Shinichi couldn’t care less! Maybe he wasn’t tempting Shinichi enough. That was a demon’s best skill wasn’t it? Temptation.

Kaito got up on his knees, towering over the detective and framing him with his legs as he unbuttoned his shirt, making a big show of it as the cotton slid sensually over his shoulders revealing wide expanses of pale, scarred skin, injuries from his stints as KID. He trailed gloved hands sensually up his hard planed torso, before reaching past his pectorals and ran a hand through his hair, brushing it out of his eyes as he captured his detective’s heated gaze.

“Huh? Do you hate me so much you won’t even let me have a taste before I’m cured, Shin-chan? I’m so hungry, but you want me to feed off someone else? Am I really that repulsive to you like this?”

Shinichi gave a swallow around his suddenly dry throat as his eyes widened. “I- No! Uh.” He was suddenly very aware of how closely the magician was pinning him to the wooden desk beneath him, the heat coming off his skin in waves as his exposed skin was close enough to charge the air with an electric current that threatened to spark across and reach Shinichi’s own skin.

“I don’t hate you.”

“Then won’t you save me, Shinichi?” Kaito asked, lips wrapping his demonic energy around the words, bringing his gloved hands to rest either side of Shinichi’s jaw, right hand thumbing over his slaw-jawed lips like it could reveal a shining pearl within those plump, delicate folds.

“I’ve saved you so many times back when you were Conan, now it’s my turn, don’t you think? Won’t you save a pitiful, cursed, Phantom Thief and let me feed, even just a little bit? Forget about the cure for a bit, I need you now. ”

He was being a little mean, using his newfound powers to elevate Shinichi’s heart rate, sending blood down south and stirring Shinichi’s arousal to hardness. But it was Shinichi’s fault for starting it. He smelled so damn edible, responding with a lustful energy that was just the right flavour to promise Kaito a well fed night if he got to ravish his favourite detective tonight.

“Ne~ Shin-chan?”

Shinichi couldn’t move, eyes transfixed on Kaito’s slightly parted lips. When he didn’t move away, Kaito’s hands pulled Shinichi’s head closer, tilted them at a slight angle to slot perfectly together and leaned in to claim his mouth in a perfect kiss.

“Ummf!” Shinichi’s eyes widened, breaking his stupor as a strong, flexible muscle delved into his mouth and twined around his tongue, coaxing little desperate moans and embarrassing whimpers out of the detective’s mouth.

“Kai-mm!”

Kaito shut him up with a clack of teeth as he surged forward and continued to drink in that light buzz of energy that was quickly thickening to a pleasant thrum. But it wasn’t enough, it wasn’t nearly enough to quench his thirst, his demonic essence greedily demanding more, more sexual energy right now! He deposited a healthy dose of venom directly down Shinichi’s throat. 

“Aaah, Kai, what was that? I-” Shinichi didn’t finish his sentence as he bucked forward with his suddenly straining erection, rutting embarrassingly all up against Kaito’s own tented slacks. His leaking brains weren’t firing on all cylinders, but he had detected a note of unnatural sweetness that coated his tongue and all around where Kaito had traced with his annoyingly long and flexible tongue. Which was to say, everywhere.

“Nothing~” Kaito teased, breaking off his side of the kiss. “Just a little concoction of slight aphrodisiac,” and a little extra helper to keep my precious detective extra hard for longer, he thought coyly. 

“Aahh, you stupid thief! How am I supposed to help you look for a cure like this?” Shinichi complained, his hands twitching in confusion with half a mind to shed his pants right here and now and the other half wanting to slap his impatient boyfriend upside the head. 

“Lucky for you, Tantei-kun, I’m still hungry after that little kiss. Famished, actually. And you look like you have sexual energy to spare,” Kaito ground his knee hard into Shinichi’s tented pants, blessing the sensitive flesh with mind-numbing pressure. 

“Aaaahh, oh!” Shinichi gasped, head tipping back and his legs falling open wider and presenting his cock to the thief like an offering. He palmed at the front of his pants as his stupid erection sucked all the mental processes from his brains, egging him to get off before even thinking about doing anything else, like looking for a cure. All he could focus on was the painful throb of his straining cock, dampening the front of his slacks with a steady stream of precome. 

“I-idiot! Look at what you’ve done. I can’t- I can’t think like this.”

That’s the point, Kaito smirked to himself with a self-satisfied grin. His Tantei-kun looked so attractive like this, so desperate and needy, writhing against his form and ready for a deep dicking.

“Oi oi,” Shinichi’s glower deepened as his knee bent up to irritably rest a socked foot against Kaito’s crotch, wrapping the first two toes around the tent and stroking up and down causing Kaito to bite off a deep groan.

“Take responsibility, you stupid thief, this is all your doing.”

Kaito looked down at the chiding detective with a lecherous grin. “Gladly.”

He grabbed Shinichi’s knees and pulled them over his shoulders, bending the detective over in half. His pants were peeled down over the long, supple line of his legs shortly followed by his precome damp underwear, exposing Shinichi’s aching cock to the air.

Practically salivating over the aroused energy exuding from his favourite detective, Kaito leaned down and captured the hardened flesh with his mouth. His incubus venom had done an excellent job, the head was angry and reddened with the increased blood flow as the length throbbed comfortably in Kaito’s mouth. Shinichi bit out a groan as he was suddenly surrounded by a wicked heat and Kaito sucked down his entire length.

“Dammit, oh god Kaito, you-”

Clearly he wasn’t doing a good enough job if Shinichi still had enough sense about him to form coherent words. Kaito let out a playful questioning hum, cutting off Shinichi’s next words as the vibration against his cock sent a new wave of tingling sensations through his skin.

“Aaaaahhhmmm, Kaaaaii-” Shinichi trailed off, muffling his words over his own fingers, curled up and white bitten between his teeth as he vocalised his beautiful pleasured song for Kaito’s ears.

Kaito stripped his fingers of his gloves and cupped his hands around Shinichi’s balls, tracing over, playing and tugging at the flesh while he bobbed his head up and down over the shaft. He took pride when he felt Shinichi’s cock poke into the back of his throat, changing his angle so that it could take up even more space and slide further into the warm, wet heat of his mouth. 

Shinichi’s wet, broken moans filled the library as his legs kicked out in the air, held suspended by their support over Kaito’s shoulders. Throughout the whole affair Kaito had rucked up his shirt to reveal his pink stained chest and perked nipples as Shinichi arched up into the air, crying out at the intense suction as Kaito hollowed out his cheeks around his length, swallowing him down. 

The sexual energy was coming off Shinichi in waves now. He was bucking into Kaito’s mouth, moving with every bob to meet Kaito head on. Kaito drank down that lustful desire like it was his own personal last supper. So good, so sweet. He could taste the energy lacing the precome that dribbled down his throat and over his tongue. It was like he was partaking of Shinichi with every swallow like he was actually feasting on the hapless detective. He had to control himself, lest he suck Shinichi dry. He didn’t want to kill his precious detective by tuckering him out. 

Kaito pulled off Shinichi with a positively obscene slurp, looking up with heavy hooded wanton eyes as he circled his tongue over Shinichi’s hot balls. He was sure he looked at least just as debauched as Shinichi did, panting and red-faced above, barely holding himself together with teary-eyed desperation.

Kaito pulled his way over Shinichi’s front, his hands crept up to take each of the tiny peaks of flesh in his hands before giving them a solid twist, causing Shinichi to let out a high pitched keen before Kaito boldly bit down over one of the nubs, digging his teeth around the dimpled skin and laving at the peak of flesh with his tongue. Shinichi’s hot, wrung out face scrunched up in ecstatic anguish.

“AaaaAAAhhh!”

It was like biting into a hot fudge lava cake. The soft, dimpled flesh split under his sharp incisors and hot, seeping blood coated his mouth in the heady, coppery taste of Shinichi’s blood, giving a sharp metallic flavour to the excess sweetness of the sexual energy buffet he was given. Kaito licked his lips, savouring the new combined taste while Shinichi let out a confused whimper underneath him.

Kaito mouthed his apologies around the area, soothing his tongue over the inflamed flesh with his incubus venom that accelerated the healing process. It quickly devolved into deep, bruising kisses mottling the skin around the bite. Kaito moved his sucking, biting ministrations further down Shinichi’s torso while his boyfriend squirmed beneath him, barely contained whimpers leaking from his mouth. Deciding he quite liked the taste of Shinichi, Kaito bit the delicate skin under Shinichi’s ribs, over the ‘v’ of his pelvic bone, into the soft sensitive skin of his inner thighs, inching closer and closer to his goal.

Kaito gave a wolfish grin up at Shinichi’s adorable scrunched up face, whining into his hands, before moving in to plunge his probing tongue into Shinichi’s quivering hole.

Shinich gave a high pitched cry of alarm, his legs jerking in a reflexive attempt to close Kaito off but kept at bay by a sudden grip to his thighs yanking them apart. 

Kaito was loud and messy, making his satisfaction audibly known as he groaned and hummed taking Shinichi’s entrance into his mouth and delivering healthy deposits of spit to the area as he sucked and prodded at the spasming hole with his tongue. Shinichi keened hid his face in his hands. It was too embarrassing, shameful, utterly mortifying as Kaito ate him out making a sloppy, dripping mess out of his entrance. Kaito’s hold on his thighs yanked him closer, the heat of Kaito’s face nose-deep between Shinich’s legs as that skilled tongue delved in deep, seeking crevices Shinichi didn’t even know he had. He had to come up for air soon right? He couldn’t just keep sticking his tongue in like that and savouring Shinichi like some kind of luxurious desert.

Except that was exactly what Kaito was doing. He sucked on Shinichi’s rim like it was the silken smooth velvet of gourmet ice-cream, tonguing deep into the depths of Shinichi’s centre like he could reach a sour candy core. 

“K-Kaito, stop it. It’s disgusting! I can’t possibly taste that good even if you are literally feeding off me.”

Well, Kaito had to disagree, even if he wasn’t a literal sex demon at the moment. Shinichi always tasted delicious when they had sex before. He just tasted that much tastier now that he could actually taste his sexual energies. But maybe he’d have a change of heart if Kaito used just the thing to heighten his lurid fantasy desert and bring his vision to life. From his pockets, he pulled out a small brown bottle, and began drizzling ropes of sticky chocolate sauce all over between Shinichi’s legs. 

Shinichi flinched when a cold, heavy, thick substance hit his skin and slid in thick, syrupy trails all over his entrance. That didn’t feel like lube. He peeked from behind his hands and deepened his red flush in mortification.

“What are you doing? Why do you even have that on you? That’s unsanitary!”

“On the contrary, my dear Shin-chan,” Kaito purred, laving his tongue over heated skin and relishing in the sweet chocolatey taste accented notes mixing in with Shinichi’s raw flavours as Shinichi squeaked. “It’s never not a good idea to carry around chocolate sauce on one’s person at all times. You never know when you might feel in the mood for a tasty snack.”

And he went back to work making sure Shinichi knew he was the tasty snack in this scenario as if there was ever any doubt and devouring his skin all over again. He split his tongue and used each demonic fork to wriggle, tickle and tease inhumanly in Shinichi’s hole in new and confusing sensations before sucking down the heady mix of spit and juices flavoured by Shinichi’s sexual energies.

Shinichi felt like his brains were being sucked out of his skull by the suction the thief applied over his spasming hole. His fingers were digging indents into his face as he hid behind them, hunched into himself and crying out in desperate moans. For Kaito to stop, or for him to keep going, he wasn’t sure. All he knew was that he felt like he could vibrate out of his skin under the incessant pressure that refused to alleviate as Kaito took his fill of Shinichi’s insides.

Kaito was almost sad by the time he had extracted every drop of the chocolate sauce he had drizzled over Shinichi’s hole. It really elevated the whole experience to another level to taste his favourite things in the world together. But it was worth it to see the unravelled, anguished mess it made of his lovely boyfriend and he really wanted to see that swollen, warm twitching entrance stretched tight and stuffed with something bigger.

Pulling back, Kaito massaged the backs of Shinichi’s thighs, which had started trembling with the strain of being folded in half for such a long savouring Kaito had taken. Giving one last kiss and teasing bite to Shinichi’s soaking rim, Kaito flipped Shinichi over so that he could finally lie on his front over the wooden desk and give his aching legs some reprieve as Kaito lost his pants.

Shinichi yelped as he landed on his stomach, shoving off another folder of forgotten cold cases which scattered leaves of paper to the floor as the cool hard desk soothed some of the heat that had been accumulating in his skin. Kaito yanked him back until his ass was sticking out over the edge, presenting an attractive, plump offering to the thief, his legs spread wide and inviting.

There was a click and Shinichi half expected Kaito to start covering him more in chocolate sauce, but was relieved to look back and see it was thankfully just lube. And it really showed how utterly insane his sex life was when worrying about chocolate sauce being used in place for lube was a valid concern. Thankfully, Kaito wasn’t quite that insane.

Kaito covered his cock and Shinichi’s entrance as thoroughly as he could with the slippery substance before lining himself up to Shinichi’s hole. He could scent Shinichi’s desire exuding in fluffy sweet clouds of cotton candy, fogging up his mental faculties as he slid his length tantalisingly up and down the seam of Shinichi’s ass, engorged crown catching on Shinichi’s hole with every stroke.

The incubus venom was singing in Shinichi’s veins, egging him on to offer himself up and let the sex demon feast on his very essence, giving up everything to the whims and carnal desires of the thief. He stuck out his ass further in a teasing wiggle, trying to entice the thief into taking what he so clearly desired.

“Fuck me already, Kaito.”

Not needing to be told twice, Kaito took Shinichi’s wrists in his hands, pulled them back and used them to yank the detective over the surface of the desk and directly splitting his hole over Kaito’s hard cock.

Shinichi cried out, his feet hooking around the legs of the desk for support, anchoring him down from being yanked clean off the edge as Kaito’s cock penetrated him thicker, heavier and deeper than his tongue had before. His heated rim split around the hardened arousal that burned against his insides, filling him up and stuffing him intimately full in a way that had his breath shuddering out from his lungs in a long, drawn out gasp. Kaito was inside of him, he was inside and grinding his hips down against his ass asking for more, the greedy thief.

Pure sex was emanating in waves from Shinichi’s energy. Drunk off the intoxicating feast, Kaito held himself back and waited until Shinichi finally relaxed his clenching muscles around Kaito’s cock. The thief took the encouraging sign to start sawing in and out of Shinichi in earnest. His cock slid into that tiny hole with a hot, searing glide, the friction causing Shinichi’s toes to curl with every stroke that pierced the venom induced fog in his brain until all he could concentrate on was that coiling heat in his core being stoked by each plunge of that demanding hardness.  Shinichi’s own hard cock was pinned up against his stomach, rubbing and drooling against the smooth, hard wood as he was pushed up and down the side of the desk with the repeated rolling motion of Kaito’s cock sinking into his ass.

Shinichi looked so perfect like this, his ass stuffed so full of cock and hanging off the desk by Kaito’s arms. He released Shinichi’s wrists and transferred his hold to Shinichi’s hips, letting the detective support himself by his wobbly arms instead as his hooked feet slackened from their hold on the legs of the desk. It was much easier this way, encircling his hands around Shinichi’s waist and using his leverage to slam him down against his thrusts, knocking stars into Shinichi’s eyes.

“AaaAAAAAAaaaaHHH!” Shinichi’s cries intensified with every brush against his prostate, the angle lending itself to easy access as Kaito’s cock found the sensitive spots that made his detective sing like a canary.

The incubus venom helped curb the burn of the stretch as Kaito fucked Shinichi with reckless abandon, sawing deeper and deeper with the repeated motion, punching little tiny helpless cries out of the detective from his lungs like Kaito’s cock was nudging against his organs with every pass, like he could fuck through Shinichi’s walls and pierce his skin to the other side.

Kaito looped his arms around Shinichi’s front, bringing the detective up and off the desk so that he was hanging off the thief’s thick cock as he gasped at the suspension in the air, the breath knocked out of his lungs and occupied instead by the shaft still lodged well within his core. 

“Aaaiiieeeee, Kaitooooo!” Shinichi screamed, high-pitched and desperate. He squirmed and writhed in Kaito’s hold, his arms shooting down over the thief’s iron clad hold and trying to loosen it, let him down before his brain broke from the penetration. Kaito smirked against his skin, his face brought down to nuzzle over Shinichi’s back as his hold tightened, refusing to let the detective escape off his cock.

Shinichi sobbed with defeat, slumping in Kaito’s arms as he accepted he wasn’t going anywhere and could do nothing but accept the thief's cock splitting him open. The sexual energy released from that acceptance almost knocked Kaito over his feet, hitting him full in the face like a sweet, sweet rush of nectar.

“Hmm, you look so perfect like this Shin-chan, pretty hole speared open by my cock,” Kaito commented, rubbing his thumbs in circles over Shinichi’s overstimulated skin. He wanted to crush Shinichi’s waist between his arms until he could feel the hard line of his cock nestled within. 

“You taste so good, you have no idea what you’ve done for me, giving me so much sexual energy to feast off.”

Kaito was smacking his lips, remembering that sweet taste of perfection that was Shinichi mixed in with the chocolate sauce. He had been completely revitalised by partaking in Shinichi’s flesh and gluttoning himself on the feast of sexual energies Shinichi had been providing him with. His horns now had a fresh, healthy sheen to them, like they had just grown in. His clammy skin had a healthy, vibrant glow. Behind his eyes wicked a low flame of red demonic energy, and his forked tongue was a vibrant red.

“Thank you for such a succulent meal. I think I’m ready to tell you about that cure now, if you still have it in you to listen.”

That got Shinichi to stir in his arms. It took him a few moments for Kaito’s words to reach his melted brains. When they did, Shinichi looked back at him with a disapproving glare.

“So you do know the cure.”

“Maaaaybe,” Kaito drawled out in a tease, grinding his hips forward to make his little detective forget about his ire. Shinichi whimpered and squirmed in his hold, the sharpness in his gaze slipping a few notches in favour of that fucked out blissful look he got when Kaito brushed up against his prostate juuuuust right.

Kaito wasn’t forgiven, he wasn’t. But Shinichi couldn’t think straight with that rock hard cock nudging right into his sensitive nerves, setting them alight and sparking white dots dancing across his vision.

“Aaaaaaaaahhhhhhh,”

“Oh? Don’t you want to hear about the cure? Understandable, I thought you might like me this way. It’s much more fun with a literal sex demon for a boyfriend, isn’t it? How sad, I knew I wasn’t enough for you when I was still human. But I think I’ll live.”

“S-shut up. It’s not like that at aaaAAA-aallll you stupid thief,” Shinichi bit out, trying and failing to speak around Kaito’s grinding up inside his core. He hated this, he had no leverage at all to pull himself off hanging from Kaito’s cock like this. He was helpless in a way he hadn’t experienced before, skewered and completely at the mercy of the magician’s ministrations. But mostly he hated how much he loved it.

“T-tell me the fucking cure.”

“Hmmm, fucking. Such a perfect word, funny you should mention that actually,” Kaito purred, shoving the detective back on the desk as he landed with a breathless ‘oof.’

“If you can remember what I’m about to tell you while I’m fucking your brains out, you might not want to cure me afterall.”

Kaito rested a hand against Shinichi’s back, pinning his front to the hard wooden surface as he pulled out, leaving only the swollen head lodged between Shinichi’s cheeks before coming crashing down back into his hot spasming hole in a brutal pace, fucking the breath out of Shinichi as he moaned.

“There’s a little magic ritual the Red Witch told me about,” Kaito began to explain, panting himself as he worked himself up to a frenzy, not caring if the detective had enough wits about him to register the words at all.

“I didn’t want to do it, because I’ve seen what she does to my classmates when she has them under her spell, she robs them of their ability to love of their own free will.”

Shinichi moaned wantonly as the assault to his insides continued, carving out a home for Kaito’s cock in his inner walls like it belonged there.

“The curing of an artificial demonic transformation requires me to make you into my Thrall.”

Shinichi sobs warbled as Kaito’s thrusts became manic, more uncontrolled and animalistic as he plunged into the warm, wet, heat without restraint.

“To create a Thrall, I’d have to bind your soul to mine. You’d belong to me, but it’s more than that. If I make you into my Thrall, I would have complete dominion over your very personhood. I’d have the power to overwrite your will, your ability to choose, your very sense of self.”

Even as Kaito chased his own orgasm, his voice started to waver at the revelation he revealed to Shinichi. It wasn’t just that he didn’t want to take the cure, he couldn’t take the cure. It was why he had to find an alternative.

“A demon’s soul starts withering away from the moment they’re created from the human base. But if caught early enough, a bound thrall’s soul can revitalise a demon’s soul, mending it and reversing the demonification.”

Shinichi’s muscles clamped down, clenching tight around Kaito’s length as he got close, so close. His fingers scratched against the desk as his toes curled up with the pressure. He thrust his ass back into Kaito’s cock as it fucked into his stretched out rim trying to draw out his release.

“If I take you, and make you into my Thrall for the cure, I could lose you. I could accidentally destroy you, it would be too easy to shatter your soul in my hands if I’m not careful, and leave you as an empty obedient puppet. I don’t want that. I couldn’t do that to you. So just forget about the cure, okay? And just let me feed off you every couple of weeks. Who needs to be human? I’ll be okay.”

With that, Kaito thrust inside a final time, cresting over his limit and gasping out his orgasm as he found his release and emptied himself deep into Shinichi’s skin, coating his insides and bubbling up around his entrance as the excess had nowhere else to escape to. The demonic magic compelled Shinichi to come with him, painting the sides of the desk in streaks of white as he came with an exhilarated cry, slumping bonelessly against the wood.

The energy from Shinichi’s release washed over Kaito, swelling over him in a warm, comforting blanket as he ate his fill and tried to avoid slipping into a food coma. This time however, it was bittersweet. The sweet flavour coated his tongue and palette even as he deliberately held himself back from consuming that extra warm, soft, beckoning taste that was the barest wisps of Shinichi’s soul. His vulnerable soul smelt like wine grapes on the vine, perfectly ripe and ready for the taking. It agonised him to not take, it was against his nature as a thief not to steal everything he ever wanted. And he wanted . He wanted Shinichi so much it damn near hurt . Just not like that. Not if having him would risk breaking him.

An exhausted hand came back to rest over his own, which had drifted down from Shinichi’s back to rest on the surface of the hard wooden desk.

“Oi, don’t be so stupid, you’ve already been like this for twenty-eight days. Hurry up and make me your Thrall or whatever. You’re so caught up in worrying about breaking me that you haven’t considered how I’ll feel losing you once your soul withers away.”

“It’s probably not so bad. Akako isn’t a total heartless bitch at school. Who even needs a soul? I’m sure I’ll be fine-”

“And yet, you care enough to be worried about breaking mine. So clearly, it’s very important,” Shinichi pointed out. “I don’t want you to break yourself trying to not break me. But enthralling me doesn’t automatically break my soul, it just gives you the power to do it.”

“And I can’t risk that-”

“So then just don’t. I trust you.”

Kaito averted his eyes, warming slightly at the blatant show of trust the detective entrusted to him. 

“You shouldn’t.”

Shinichi shook his head. “Too bad, we have a cure now and I’m not going to let you martyr yourself in a stupid act of self sacrifice when I’m already willing to give myself over to you anyway. This will just make the whole thing more metaphysically official.”

Kaito blinked in wonderment. Did Shinichi just say-

“Meitantei, you’d do that for me? Are you telling me you want to use this cure to marry me?”

Now it was Shinichi’s turn for his face to warm up to the tips of his ears. “I-I mean, if the ritual demands it-” he spluttered.

“No Shinichi, I won’t take your soul just because of some stupid cure,” interrupted Kaito, intertwining his fingers with Shinichi’s in a solid grip. “Do you really want to be mine? Bound in soul and belong to me?”

Shinichi’s face flush deepened as he looked away in embarrassment. “I… I’ve been thinking about it for a while now.”

Kaito was so happy he could have floated over the moon. Oh, what had he done in a previous life to deserve such a perfect boyfriend? He’d always thought Akako’s nickname for Shinichi had been odd, the so-called ‘Demon of Light’. But now, he believed it. If anyone could cleanse Kaito’s wretched, cursed, demonic soul, it would be his detective. His virtuous light would chase away the darkness and cure his withering rot. And all Kaito had to do was finally make him his own. The thought of making his favourite critic his, down to his very metaphysical soul, was too addicting.

“So, what do we have to do for the Ritual?” Shinichi asked, hiding his blush behind his free hand and refusing to look Kaito in the eye.

“Hmmm, it’s surprisingly simple, really,” said Kaito, gingerly pulling out of Shinichi and allowing his release to drip all down the inside of the detective’s thighs in a soaking mess.

Shinichi grimaced at the unpleasant sensation, knocking his knees together as he was brought up to sit in Kaito’s lap, wincing at the filthy squelch of his soaked entrance leaking all over Kaito’s thighs.

“K-Kai!”

“Oh hush, you’ve literally done worse to me before. What’s a little come on my leg?”

“That’s not- it’s coming from my ass!”

“And? I put it there myself. It’s not news to me.”

“Well I’m not happy about it!”

“Do you want to hear about the Ritual or not?”

That shut Shinichi up quick. His mouth clacked shut as he settled himself on Kaito’s lap, squirming uncomfortably but wordlessly at the continued ebb of fluid leaking out of his aching hole.

Kaito grinned. His detective was too cute like this, blushing and made to shut his mouth and obediently stay, knees too weak and fucked out to stand on his own two feet.

“To Enthral a human, I just need you to accept a special piece of chocolate from me. One bite, and your will is mine.”

“Chocolate? You can’t be serious.”

Kaito shrugged. “It’s what Akako tried to trick me with when I first met her. I don’t make the rules I just play by them.”

Shinichi gave an exasperated sigh. “Alright, fine. And do you know how she made that special chocolate?”

Kaito gave a sheepish grin. “Funny you should ask actually. A better question might be ‘have you thought about where exactly I got my home-made recipe for chocolate sauce from?”

Shinichi’s eyes widened. “Kaito you didn’t-”

“I never got to have her chocolate because I didn’t want to become her Thrall, but I was curious about how good it tasted!”

“Kaito!”

“What!” Kaito complained, holding his hands up defensively as Shinichi glared hotly at him from his lap.

“It’s come in useful now, hasn’t it? I haven’t given any to anyone else and I only make it just for me so it’s not like I was Enthralling people in school like that Witch.”

“Kaito.”

“Fine,” Kaito huffed, once more producing the bottle of chocolate sauce. “Once we’re done here, I’ll stop making Enthralling chocolate sauce. I’ll find a new recipe online or something.”

With that, Kaito took the nozzle of the bottle into his own mouth and emptied the contents. With his mouth full of sweet chocolate sauce, Kaito leaned in and took Shinichi’s lips in an open mouthed sticky kiss, transferring the magic infused treat into his mouth. Shinichi swallowed down the sweet confection greedily, taking it into himself. He felt the tingle of magic settle into his skin as he surrendered his soul to Kaito, locking him under his wing.

Shinichi’s soul was a bright ball of light. Kaito could see it in his magical mind’s eye vision, twinkling with finely spun filaments that could so easily break off if Kaito merely touched it. His own blackened, smoky soul came into view as well. It was considerably smaller than Shinichi’s, eaten away for weeks and rotting from the inside out. A magic tether formed and tied the bright fiery ball of Shinichi’s soul to his own and started to draw it close. For a moment, Kaito was terrified his soul was about to eclipse Shinichi’s, the smoke growing in thickness and blotting out the light as it surrounded the pair in an inky union. Shinichi’s soul shook, like it was going to fracture. Kaito’s heart caught in his throat when he saw the first cracks appear on its surface, the filaments flaking off in a shower of silvery dust. Back in the real world, Shinichi’s eyes had begun to glaze over, a blank expression taking his face as Kaito began to despair. But then, burning light pierced through the dense, dark fog as Shinichi’s soul let out a renewed pulse of determination, repairing itself, sealing the cracks and growing new stronger filaments that stabbed into Kaito’s soul, pumping in light and supplying it with renewed human strength to fight back the darkness. Kaito gasped as he felt the effects immediately on his own physical body. His horns began to crackle with white lightning. The flames of power in his eyes snuffed out in favour of a vibrant blue glow cutting through the demonic red and expelling it. His horns shattered away in obsidian glass shards from his head as his soul shed its shroud of darkness, burned away by the bright light of Shinichi’s soul that encouraged it to return to its original human light. He felt himself heal from the demonic influence purged from his skin.

When it was finally all over, Kaito touched his fingers to his face, over his hornless skull, feeling the human shape of his tongue in his mouth.

Shinichi kissed him, dragging him back to earth and holding his attention.

“Hey, are you still with me?”

Despite being completely human again, Kaito could still see their souls if he closed his eyes. His mind’s eye could see the two balls of light, one nursing the other, as they floated together happily bound together. Shinichi’s will was still his own, Kaito hadn’t broken him. They were still each themselves.

“Y-yeah. I’m here. Are you okay?”

Shinichi closed his eyes, remembering the strange sensation.

“It felt weird for a bit there, like my mind had started to slip away. But then I just reminded myself that ‘wow, this was really happening. I was really going to be yours,’ and that made me so, so happy, that it felt like nothing could stop me.”

Kaito smiled, mentally cradling the precious jewel his detective had given him. Shinichi had done it, he’d really healed him. He trusted Kaito to hold his soul close, to keep it protected in a little jewellery box called his Heart. It was a treasure that Kaito could never, ever break. And now it belonged to him, and it was precious.

Kaito kissed Shinichi back, pushing the vision of their souls together into Shinichi’s mind as the detective’s eyes widened when he received the vision.

“I- you can see that? Didn’t it work? Are you somehow still a demon?”

Kaito chuckled through his second kiss, cradling Shinichi’s head against his own, savouring the warm heat against his own human skin.

“No, can’t you see that light? Coming from the little soul. It used to be all black before. But you cured me Shinichi. Thank you.”

Hesitantly, Shinichi rested his own hand in the soft locks of Kaito’s hair, letting them lay close.

“No need to thank me, stupid thief,” said Shinichi, lightly petting Kaito’s hair as the thief preened beneath him. 

“Besides, you look much better in white.”