Chapter Text
“Hell no dude. Gross.”
That was Denji’s immediate response to Yoshida’s proposition.
“Why? What’s so gross about it?”
“First of all, you’re a guy. Second, you have a dick,” Denji held up a finger, adding another as he listed off the reasons, “Third, you’re also an omega, idiot. How are you even gonna help?”
Yoshida hummed, an amused smile on his face, “I do happen to be an omega. But that doesn’t mean I can’t make myself useful.”
Denji’s face was a mix of doubt and disgust. Yoshida continued, “Have you ever tried putting anything up your ass Denji? Other than your fingers?”
The boy in question sputtered, face flashing bright red, “That-! This is sexual harassment!”
“Oh? I’m just asking a simple question. You don’t have to answer if it makes you uncomfortable.”
Denji glared at him, grumbling under his breath. He didn’t give a further response, but his classmate was undeterred.
“Well, you know I have my contract…”
“Huh? What about it?” Denji scrunched his nose at the sudden change of topic, before realising it wasn’t a change of topic at all, “...Dude. Oh my God .”
“Hm? Are you interested?”
It would be a lie to say he wasn’t the tiniest, littlest bit curious, but no way was he going to admit to this particular creep, “No.”
Yoshida had a smug look on his face, as if he knew exactly how Denji was imagining the octopus devil could be put to use. He took a step closer, spotted by Denji who narrowed his eyes at the movement. They were in an empty classroom, where Yoshida had cornered him as soon as classes had ended. His heat was due any day now, which he knew Yoshida was very much aware of as he openly kept track for some reason. Said it was ‘an important part of keeping an eye on Chainsaw man’.
“I’m just offering you some support during your heats. I’m aware of how painful it can be when you aren’t mated. I might not be able to help much with my pheromones, but using something bigger and… alive, makes a difference, believe me.”
Oh, Denji believed him. He shuddered as the image of tentacles coiled around Yoshida entered his mind without his consent. Warmth crept up the back of his neck, and he was appalled to notice himself getting slick between the legs.
This conversation needed to end. Immediately.
“Ugh, Stop! I’m not interested! No means no you creep!”
Before Yoshida could say anything else, Denji shoved past him, running from the room. He needed to get home. Quickly. Thankfully Kishibe had already picked up Nayuta the day prior, as they had an agreement for Denji to have the apartment to himself once a month. So he could lock himself in the bedroom and deal with his heat alone, as he always did.
He didn’t need any help from Yoshida.
But once he was able to hide away in his nest and the delirium had overcome him, he couldn’t get the damn offer out of his head. Fingers weren’t enough, toys were expensive, and his luck with alpha women had so far proven to be non-existent. He cried in frustration, pumping three digits into himself, on his hands and knees, face pressed to the cool floor. Needing more. Warmer. Bigger.
Those tentacles were pretty big weren’t they?
As soon as the thought entered his dazed mind, he couldn't get rid of it. Thick appendages sliding around his thighs, holding him down, spreading him open. Entering him roughly. Bumping repeatedly against that spot inside that had him seeing stars.
Denji’s hole leaked more down his legs as he imagined being taken by the devil, his teeth sinking into his arm as he moaned loudly. Then, two black eyes glaring down at him with mirth entered the fantasy and he finally came, coating his stomach and futon.
The haze cleared for a moment, and Denji purposefully banged his head against the floor.
Fuck.
*
“Fine.”
Yoshida blinked up at Denji, surprised at his sudden appearance beside him while he was changing into his school slippers. Then a charming smile spread across his face as he stood up to greet him, “Ah, hello Denji. How was your heat?”
The question went ignored, “I accept your help.”
This seemed to stump Yoshida for a moment, his eyes widening.
“But! I’m setting some rules.”
“...Okay.” Yoshida collected himself, clearing his throat, “Go ahead.”
“You. Don’t touch me.” Denji pointed at him, his eyes narrowing, “And don’t look at me either. Just tell the octopus what to do and leave the room.”
Yoshida’s lips twisted into a bemused smile, “I have to be in the room or I can’t control them properly.”
Denji didn’t think that was entirely true. His eyes narrowed further, but he moved on, figuring it was too much hassle to argue, “Fine, but stand and face the corner at all times.”
An amused huff came from the hunter’s mouth, one eyebrow arching high in disbelief, “... Okay? ”
“Okay,” Denji paused, not knowing what else to say, “Then… My next heat.” He nodded once in finality and made his leave, forgetting to change his own shoes before heading to class.
*
Denji’s heat didn’t come around again for another month but that didn’t stop him buzzing with anticipation the entire time. Not that he was excited or anything. It was nerves. Who knew whether that pervert would actually stick to the rules? Denji didn’t have a lot of faith that he would.
They spoke about it once more to arrange the place, Denji’s apartment, and then surprisingly Yoshida didn’t bring it up again. Denji waited for relentless teasing, or to be told that it was only ever a joke, but it never came. He even wondered if Yoshida had forgotten. How could he be so casual about it? It probably was just to help him with his job, but still.
Maybe he’d done this for someone else before.
Denji sniffed, weirdly annoyed at the thought. He didn’t want to be seen as just a nuisance who had to be sated with sexual favours.
He’d taken the day off, having woken up with the symptoms of an oncoming heat. They had agreed he would text Yoshida when the time came, but while he was still able to think clearly he debated whether it was such a good idea after all. That guy could do anything to him while he was in such a vulnerable state. How terrifying .
Before Denji could make up his mind about getting Yoshida involved, he received a text.
Since you’re not here I assume your heat started. I’ll be over after class.
So he noticed. Denji didn’t bother to reply. His stomach had started to ache as soon as he read the message. No going back now.
The hybrid kicked all the pets out of the bedroom, shutting himself in. He sat down on the futon, undressing so he didn’t ruin his clothes. Since he’d had some time to prepare, he’d made a sort of effort to clean up the apartment and already built his nest. He double checked everything, including making sure he had something to cover himself when Yoshida arrived. Then all he had left to do was wait.
Denji didn’t want to touch himself before Yoshida got there, not wanting to be walked in on while jerking it, but as his heat set in, he was starting to get antsy. He pushed two fingers into himself to ease the pain, and tried his best to keep it at that.
Despite there being no clock in the room, it felt like time was passing by agonisingly slow. Sweat dripped down Denji’s face as he grit his teeth. Holding back was starting to feel torturous, and he kept catching himself pumping his fingers. When the hell was that guy gonna show up?
He let out a frustrated growl, sitting up and searching for his phone, when his bedroom door swung open. Denji made no attempt to cover himself, panting as he looked up at Yoshida, who stared back with wide eyes.
Then, he turned away quickly, his flushing face. Such an odd sight that Denji almost felt sober for a moment. He coughed awkwardly, “Ah, I guess I’m late.”
“Damn right you’re late,” Denji snapped, quickly removing his fingers from himself, “Now hurry up and get that octopus thing to fuck me.”
Yoshida coughed again, seeming to choke on nothing. He still didn’t look over again, “Right, well, yeah.”
He closed the bedroom door and moved to the corner, facing the wall just as he’d been told. If he had been in his right mind, Denji probably would’ve laughed at how pathetic he seemed. Part of him, however, was happy that his rules were being respected. Who would’ve thought?
“You ready?” Yoshida asked, his voice sounding deeper than usual. He was very obviously sniffing the air. Fucking perv.
Denji shivered, licking his lips, “Get on with it.”
Holding his right hand up beside his head in clear view of Denji, Yoshida crossed his index and middle finger, “Octopus.”
Denji yelped as a tentacle appeared instantaneously from inky smoke, curling around his ankle. It was gentle, as if not wanting to startle him. He held himself as still as possible as it began to creep up his leg, cups sucking onto his skin, and he couldn’t stop the whimper as it eventually coiled around his small length.
But then it was moving again, continuing to simply explore. Tickling through the short hair below his belly button, stroking up his sternum, curiously playing with the pull cord, flicking against one of his nipples. It even caressed his cheek, as lightly as possible, the sensation odd as it was slimy. Yet Denji leant into the touch, mind clouding over as he was petted. The tentacle seemed enthused by his response, wriggling against his cheek with more force.
A chuckle reminded Denji of the other person in the room, “They like you.”
Denji glared at Yoshida’s back, his cheeks pink, “Why would it like me?”
“You’re cute.”
He must have only been teasing, but he said it as a simple statement, flustering Denji too much for him to form a reply. He just swallowed, pouting to himself.
As if jealous to not be receiving attention, the devil suddenly swept back down across Denji’s chest, pulling at a nipple roughly. Denji cried out, arching his back as a bolt of pleasure shot straight down his spine.
“Hey!” Yoshida reprimanded, going to turn but then pausing as if he remembered he wasn’t supposed to look, “Be gentle.”
The tentacle calmed slightly, but was mostly undeterred as Denji clearly enjoyed what it was doing. It continued to pluck at his chest, focusing on making one nipple swollen before moving on to the other. Denji panted, starting to get into it. Should a devil be this good at sex?
How often did Yoshida do this?
Too distracted by the tentacle working hard on his chest, Denji failed to notice the second that had crept up in between his legs until it was wrapped around his cock. His head fell back, mouth parting around a moan as it stroked him, building up a steady pace.
It was good. But it wasn’t enough.
“Ngh, in- inside, please…” He whimpered, dizzy with pleasure.
Denji ignored the laughing from the corner, focusing instead on the tentacle pushing between his legs, spreading his cheeks to expose his leaking hole. He thrust his hips into the tentacle wrapped around his length needily, impatient. Finally, finally , the tentacle pushed inside. It was an odd feeling, the thin tip wiggling its way in like a worm, slimy. But then as more of it filled him, it got thicker. Almost like a knot. Denji sobbed in relief, his eyes shutting.
“How is it? Good, right?” Yoshida sounded smug.
“Sh-shut up,” Denji groaned, brow furrowing, irritated by the distraction.
Again, annoyed by Denji’s diverted attention, the tentacles pumped harder, drawing it back. His eyes rolled, white spots flashing across his vision from the strain, and drool coated his chin as his mouth hung open. The member inside rubbed intensely against the same spot, ripping an inhumane sound from his mouth.
He had never felt anything like it. There had always been that need there, to be knotted. But Denji hadn’t realised it would feel so good . And this wasn’t even the real thing.
He was unable to control his thoughts as he quickly approached orgasm. The image of someone- Yoshida leaning over him, between his legs- eyes focused on him- forcing his knotted cock inside-
“Ah- ‘Shhida!” The name passed his lips before he could stop it, not that he could care in the moment as he painted his own stomach in cum.
His body fell limp, but hands caught him before he could collapse in a heap. Denji tried to look around, but his eyes were bleary. He could make out Yoshida holding him gently against his chest, rocking him slightly as he murmured soothingly. Denji had no idea what he was saying, yet it was comforting all the same. Exhausted, still woozy from his heat, he let himself pass out in Yoshida’s arms.
He was in and out of consciousness after that, Yoshida there every time, cleaning him, feeding him something, standing in the corner as Octopus helped out. Whenever Denji’s eyes were open they refused to leave the other boy, seeking him out immediately.
It was only after a few days of this, when Denji awoke feeling like he’d had the best nap ever, that Yoshida wasn’t there to greet him.
Fuck .