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If you want a reference for Beel's dick in this, I have even helpfully drawn one. I have one for all the brothers for when I get around to theirs
Seasons in the Devildom are a poor replication of the human world, or the Celestial realm according to Simeon, but you wouldn’t know the comparison there. Winter has set upon you, with a cold chill that has shaken the Dread Maple trees to their core to where their red leaves have scattered the ground like pools of blood. It was fascinating at first, but coupled with the ice and slush piled atop them, had turned them into a slimy slip N slide waiting for any unsuspecting victim. And catch victims it did. From your seat in the classroom, you had a great view over RAD’s astonishingly large courtyard where the demonic trees had shed. It also meant you had a first-class seat to the various demons hitting the deck and rubbing their pained behinds as they stood up and wobbled off. Now only if Lucifer… Stopping that thought in its path with a snigger, you turn your attention back to the class. Demon Biology was probably one of your favourite subjects and the one you were doing best in. Today was a class on heat cycles and you were only semi-paying attention to the fact that you were missing the brothers from this class. Although, they were thousands of years old if not more, and you would assume they knew at least a little of how they worked especially given they’d probably been around the block a few times. Asmo would have laughed at that thought, the man was sex personified, and you were sure that he knew even more than the teacher of the class did about this sort of stuff. Still, despite the enjoyment, the class dragged on a little, not long to go.
“During a mating cycle, demons will have enhanced sense, and they will often be drawn to potential mates, particularly if they are also fertile,” The teacher droned, his dark grey eyes raking the class. He had already domed a few students with pinpoint accuracy with the board cleaner as they snickered immaturely, “Though they may entirely avoid the object of their infatuation if they think it will not be reciprocated. Other symptoms may include aggressiveness, a lack of appetite, scent marking…”
Hmmm, that sounded familiar. The last few days you had been treated like the plague by your favourite cinnamon roll, the Avatar of Gluttony himself, Beelzebub. Your heart bubbled at the thought of the big ginger teddy bear who hadn’t been around recently, and had declined your usual cuddle sessions, sandwiched between him and his twin to sleep through the cold nights. Beel ran very hotly, and Belphie slept through anything, so to have them both radiating warmth meant that you could finally feel your fingers and toes at night - ignorant of the complaints from the other brothers. You were dragged from your thoughts by the teacher directing a question.
“Human, how would you reciprocate a demon's advances, assuming you were interested?”
Oh, you had read about this thankfully, given that you hadn’t been paying attention.
“By offering gifts, building a nest suitable for both parties… Physical affection… It depends on the individual demon really, they all have preferences.”
“Hmm.” That was the only reply, apparently, he thought he would catch you not paying attention, “With any mate that you plan on spending a heat cycle with, you need need to be prepared for anything with them, and know their personal preferences. It’s often a good idea to smell of them, as other scents can cause aggressive reactions.”
“Sir, what about one-night stands?”
There was a giggle and a heavy clunk as the board cleaner sought out its next target. “He has a point, that is why lust demons exist. They are well aware of how to help deal with heat. Anyway, this will be on the quiz, so please ensure you have brushed up.”
With a long-winded sigh and a plan, you left for the House of Lamentation. One quick stop before you set up in your room, stepping into the library to catch Satan. If anybody knew what books to check, or the answers to your questions, it would be the fourth brother with his gorgeous golden hair and green eyes. Sure enough there he was, with a book in hand, strewn elegantly across the couch in the library, raising his eyes above the pages to welcome you. Though from the determined set of your shoulders, he knew it wasn’t a social visit, despite how well you tried to feign indifference and pure curiosity.
“So we learned about heat cycles today.” You said to him, settling on the couch next to him. A singular raised eyebrow mocked you over the top of his book, “And y’know, I don’t think I’ve noticed you guys going through that yet?”
“That’s because we spend it in our rooms.” He huffed, his bookmark slotting into the pages before the book was placed on the coffee table and he crossed his arms behind his head. “Is there a reason you’re asking?”
He was going to wring every last drop of embarrassment out of this from you, wasn’t he? Cruel little shit. “Well yeah, it is something that… Well, a human could help with?”
His grin reached his ears, and those emerald eyes twinkled with a hint of deep blue, “Wouldn’t be the first time one of us fucked a human, though I think it would be for Beel…”
“Who said that… Why would you think..?” The humour still hadn’t left his features, and you sighed in defeat, patting his leg absent-mindedly, “Yeah okay, I want to help out Beel.”
Satan was surprisingly more helpful as you admitted to him what you wanted, only laughing once as you wondered how to keep so much food in your room for the duration, and how on earth you would explain to Lucifer why you were missing your classes. He had also given you a few different items he swore by, like some sort of soap that completely washes demon scents away, with a warning that Beel had the strongest sense of smell of them all, and would pick up if there was another on you. You had one of Beel’s hoodies that would be great to wear with... Nothing else beneath it for the not-so-teddy-bear to enjoy. He also told you to be prepared for his brother’s demon form and the changes that came with it, but you laughed it off. Given he only had some horns and wings, the changes couldn’t be that drastic.
Oh how wrong you were.
After an hour or so you were ready, or so you thought. A big pile of pillows and covers were on the bed, and you had spent some time laying in them, adjusting them until you could curl up and stretch out with maximum comfort in mind, whilst still being supported. They were all in reds and oranges - in Beel’s colours - to attract him a little more, and by rubbing yourself through them, you’d ensured that he would smell it, even if you couldn’t with your pitiful human nose. You had showered with the strange soap that Satan had given you, eaten well and made sure there was a basket of snacks available, as well as a full mini fridge that had been jacked from Levi a while back. Everything seemed to be going exactly how you wanted it so far. The lights were dimmed, the candles extinguished in case of fires and the scene was set. Well, except for one last thing. Asmo had very helpfully provided chocolates some time ago, ones that you definitely had sneaky suspicions about as he passed you them with a wink, a kiss and a “You’ll know when to use these.” You had a feeling that this was what he meant. Popping one in your mouth, your face scrunched. Oh no, this was not tasty. In the nicest possible way, it tasted like ass . Chewing the sticky snack, you forced it down, feeling an almost instant warmth spread from your lower stomach, and wetness began to pool between your thighs. How in the hell did it work so quickly?
Brrrr brrrr brrr came the buzz from your D.D.D. on the bed, showing Asmo’s face on the caller I.D. You answered with a whiny huff.
“Oh darling, you sound positively wonderful ,” His own voice was high and breathy, “I can smell you from here, who’s the lucky demon?”
“As-- Asmo,” Taking a deep breath, you pulled your melting body together, “ What the fuck. ”
“You smell like a demoness in heat, sweetheart, so I suggest you find whoever it was you took them for before someone else finds you.” There was a click on the line, and your shaky hand found your contacts, barely noticing as the other one sank between your thighs, circling your clit with the lightest of touches. Just as the deep voice answered on the other side, a reedy cry left your throat and there was no doubt at all what you were up to on the other side of the phone. Had you not taken those damn chocolates, you might have felt a pang of embarrassment light up your cheeks, but right now, you could only think about the demon on the other end of the phone and the low growling that had nothing to do with his stomach.
“You have no idea what you’re asking,” He gritted out between his teeth.
“Beel… Beel please,” You whimpered, “Please, I need you,”
There was a deep breath, and a grunt of something that sounded vaguely Infernal on the other side of the phone and another ripping snarl, “I’ll come, but don’t say I didn’t warn you. You smell so good, I might just devour you.”
That was far less of a threat than it sounded, as you slipped two fingers in easily, gliding through the slickness to scissor them and stretch you out. Beel had always been a gentle giant when it came to the brothers and you were completely sure that he'd be gentle with you in bed as well, right? Though through your lust-addled mind, the little voice of reason was screaming about how the growling, ferocious beast on the other end of the phone was not your Beel, and that any minute he would be…
Nearly taking the door off its hinges, he arrived with a snarl, taking up the entire doorway. A deep, thick sound like helicopter blades was droning in the silence as his wings buzzed against his back as he laid those violet eyes on you - laying back with legs spread, folds glistening wetly for him. Pulling your fingers towards your face, a shocked yelp escaped as your entire vision was taken up by the big demon, pulling your fingers towards him and sucking them into his mouth. His eyes shut, and your own lust roared back as he positively purred around your fingers. Never had you seen something so sexy as his tongue weaved between the digits to lick every last drop of your essence from him. Longer than normal, his tongue curled around your fingers as you watched, his lids lifting to reveal just a flash of purple drowned out by his pupils, watching for your reaction.
Cleaning your fingers off completely, he reared back, dropping his studded leather jacket in the corner, the black vest torn clean off, revealing what could have been the body of a god - an angel fallen indeed. Your free hand reached out to him as he puffed his chest and rumbled deeply - a display if you remembered the books and classes correctly - with his insectoid wings spreading behind him. His skin was almost luxuriously soft and incredibly warm where your fingertips dragged across his abs before once more the effects of the chocolates kicked in and you clutched his belts, pulling him down. Lips met in a hot, wet clash and a click of teeth. There was a coppery taste as his fangs caught soft lips and pierced, but it only spurred him on, tongue demanding entry to tangle with your own. A wanton sigh escaped your own lips as his jeans pressed hard against your core, his clothed cock throbbing beneath them and just for a moment, you wondered if you had made a horrible mistake because Beel was big everywhere . Heat radiated from him like your own personal sun, and he growled into your mouth as exploring hands traced lightly around the base of his wings. They were not as fragile as they looked, and you felt them vibrate against your digits as you scratched lightly around the base.
Beel's lips moved south, nibbling across your jawline until he reached your ear, grinding hard into you until a cry rose from your throat.
"Let everyone hear you, they can all smell you." He whispered, "But it's me who will breed you, and mark you, okay?"
The only answer was a nodding of your head, before he placed a kiss on your neck, so gently over the pulse point. That was more like your Beel. Not this ravenous beast, but a gentle teddy bear. He was still there, making sure you were okay, despite being hard as a rock between your thighs and giving you friction burns from the jeans. Making short work of his belts, he sucked and nipped dark marks into your neck whilst still rocking his hips. It made undoing his jeans infinitely more difficult, but it helped ease the awful rush of heat that was streaming from your core. Eventually, he left you, letting you whine and make grabby hands at him to strip from the waist down. Apparently, the sharp withdrawal of breath was very much worth the gleaming smile and flash of fangs on his face, followed quickly by the rising blush. His demon form was more than just the horns and wings it seemed. His cock was like something out of some kind of fantasy porno, segmented and so much thicker at the base. Sharply curving upwards, the tip was a bright magenta, fading to a deep purple at the base, each ridge decorated with a dark black stripe - it was a work of art and a fucking terror. Reaching out to wrap your hands around him sent another shiver through you - both frightened and wanton - that even around the tip your fingers wouldn't meet. The ridges were thankfully not as solid as they looked and shifted beneath your grip as your hands wrapped around him and began playing against the thickness. Beel growled above you as you lowered your head but kept your eyes upward towards his, even as your tongue darted out to taste the pre-cum gathering around the narrow slit. He tasted like cookie dough, which was very unexpected but not at all unwanted, and made it easier to slide your lips past the first ridge. Clawed hands settled in your hair, and Beel had returned to himself a little, ensuring he wasn’t forcing you down at all. Well aware of his own size, the last thing he wanted to do was damage you, but he was desperate and the demon in his head was screaming that he needed to take you before one of his brothers came and took over. Despite how big he was, he truly wouldn’t win a fight with them when it came down to it, so he had to act quickly. The scent of you was driving him mad. Gently extracting himself from your mouth was the hardest part, and you found yourself on your back roughly once more, legs pressed upwards to give him a full view of your sopping cunt in front of him.
“I’m sorry…” He choked out, rubbing the tip across your lips and spreading as much of your wetness as he could, “I need this. I’ll be good next time, okay?”
Next time… Oh, there would definitely be a next time where you could take your time with this sweet, handsome guy, but right now as you burned up inside, you only needed one thing, “Please, Beelzebub, just.. Fuck me please?”
You didn’t need to ask him again as the tip breached your sopping hole, pushing forward steadily. Every ridge sent jolts of pleasure through you as they popped in one by one until the thick base reached the entrance and he pulled back. A stuttering growl could be heard from above, but as he hooked your legs over his elbows and pushed you down - practically folding you in half - you responded with a deep groan at feeling him seated inside. The stretch was just on the border of pleasurable pain, and painful pleasure, but it was almost a dream come true to finally have him there. Pulling back out was an experience all in itself, the ridges angled back ever so slightly and dragging the pleasure on that stroke as well, now with the addition of his hips grinding your clit with most of him pressed against you. Lips sought yours once more, and he moaned deeply into your mouth as he pushed back in - avoiding the thickest part once more.
Letting your arms weave across his broad back, you dug your nails in ever so slightly and watched his eyes flutter shut, dodging his mouth to lean up and whisper in his ear as the lust fog broke with his entry.
“Beel, I can take you all.”
He shook his head, burying it into your shoulder and huffing out between nips to your throat, “Can’t, it’ll be over if I do.” He gave a few short, sharp thrusts, seeking out that spongy patch that would send you into orbit with the pleasure, “Can I knot you, please.”
“Knot..?”
There was no time to answer as your eyes rolled back, Beel rocking his hips faster, probing for just that little… There, when you cried out his name and clenched around him, he knew he had found it. Driving against your insides with pinpoint precision, you could feel the threads of your orgasm building in the pit of your stomach, nails digging crescents into his broad back. From his chest came a low purring sound, his wings buzzing behind him as he picked up the pace like a man possessed. He didn’t return to your mouth, choosing to keep his face buried in the join of your neck and shoulder, inhaling deeply though you could swear he was drooling on you - presumably from the scent? Oh Diavolo, he wasn’t going to eat you, was he? All thoughts were driven from your head as he managed to snake a hand between you and press gently on your clit with the pads of his fingers. That was the last push you needed to send you over the edge. He stuttered in his purring, and you felt it, the last few ridges swelling as they pushed through the tight ring of muscle. There was so little space for any more of him as it was, the tip forced sharply against your cervix. There was no room for movement, and there was pressure, so much pressure and pleasure as his knot popped in and locked him inside you, spilling his seed in a wave of liquid fire. At the same time, his fangs pierced your shoulder, drawing blood with a pained gasp. Trying to move only resulted in a sharp snarl as you tugged at him, though the panic that set in overrode the lust a little as you came down from the high.
“Don’t move, please,” He breathed, tongue laving against the spill of crimson from your flesh, “It hurts when you do.”
It was so sweet that you knew your Beel was back now. Having absolutely rearranged your guts and… Stuck inside you? But it was him.
“What’s happening?” Your voice was much quieter than you had hoped for, running soothing pets down his damp back, and up to ruffle the ginger fluff around his horns. Letting your legs stretch out, he lifted you in one movement, grinning at the squeak that escaped to spin you both around and lay back on the bed, carefully arranging you atop his chest so you were both comfortable. Surprisingly, he fit well in the nest you had built, rubbing his face in the softness of the blankets. Apparently, your nest was acceptable to the big gluttonous demon, and you waited for a response as you tensed around the thick bulge in your abdomen.
“Its, ahhh,” Oh he was blushing a bright cherry red now, that’s adorable, “A knot, to make sure I stay inside and so does everything else, to make sure I get you pregnant.”
“Oh.” His heart was pounding beneath your ear, and you could feel it inside you as well, “So how long will we be like this?”
“Maybe half an hour. Sometimes more, sometimes less.” He shrugged those beefy shoulders and you rose up to lean on your forearms to look at him with obvious shock, his violet eyes carefully avoiding yours. As you opened your mouth to berate him for not telling you sooner (although did you really get a chance to talk this through?) there was a roaring grumble through the room that had you both laughing, and Beel took a hand away from petting you to rub his stomach, “I’m hungry.”
“It's okay!” You chirped, reaching for the snack basket beside the bed, and feeling the uncomfortable tug that had Beel grumbling like his stomach, “I came prepared!”
There was a look in the demon's eyes that made your heart flutter just a little, something you had seen before - when he had snuggled in after his nightmares awoke him, or when you made his favourite food, or let him lick the spoon when you baked - it was pure, unfiltered love. Bless this big teddy bear of a man for such simple pleasures lighting him up like that. Even with a pair of wickedly curved horns, those big fly wings, and whatever his dick was doing inside you currently, he really did love you and wore it plainly on his sleeve. Pulling you down into a fierce bear-hug he kissed you ever so sweetly and let his feelings pour out through his lips. Both of you were gasping for breath when he was done, and he reached for the snacks.
“So, have we dealt with your heat then?” You asked, pinching a crisp from the packet as he opened it, letting it crunch between your teeth.
“Mmm, no, still a few days left.”
By the time Beel was back to himself, those horns and wings folding away to wherever they went, you were pretty much unable to walk. He had taken you countless more times, stopping only to make sure that the delicate human was well-hydrated and at least partially fed. Part of his thank you involved a long hot shower and he massaged your aching thighs, pointing out how many muscles group you had both used. You couldn’t help but laugh at him as he proceeded to then carry you everywhere until you could walk properly again and promised him that you would spend any of his heats with him if he wanted.
“Of course, you’re my mate now after all.”
So much warmth flooded your heart at that, and you drew him down for a sweet kiss.