Prompt: Omegaverse by Shini

Kinktober Day 14: A/B/O (It's late I know…)

It had been prickling under her skin for a while now. Like an itch, building, that she couldn't get rid of. All across the Seireitei, the Omega's had started to become restless. Their restlessness had been spreading to the Alpha's who were quick to anger.

After nearly a decade of peace, the souls had begun to settle. It no longer felt like they were bracing for the next big war, and with the relaxation, some of the natural mating cycles had started. It was very clear that soon, the Omega's would be going into heat, something that had been delayed for almost a century due to all the wars and stress.

The Alpha's had started to quarrel amongst themselves, and courting had started too. Rukia was shocked when she'd heard that Captain Hitsugaya had finally summoned the courage to try and court his Lieutenant. Rangiku was over the moon about it, and she boasted to anyone who would listen about how powerful their children would be.

Rukia had been doing her best to ignore the way her body heated randomly throughout the day, she tried to ignore the way her bed always felt cold and empty as she fell asleep at night. The more she tried to ignore it, the worse it got.

Byakuya had taken to hounding her, like a protective presence, but his brooding just served to make her more anxious.

So she'd run away.

Technically, as a Captain herself, she was free to go wherever she wished, but Byakuya had insisted she stay closer to home to complete her work until she had her first heat, then they could plan around her cycles so she was safe. Rukia could imagine nothing worse. She dreaded the idea of going through a heat alone, and that's when she realised there was only one person she could stomach being around.

Raising her hand, Rukia knocked on the dark metal door of the apartment complex. She knew the area where he stayed but she'd never been to his house since he'd moved in. They'd always met up outside, in a café or at his University.

The door unlocked and was pulled slowly open to reveal a blearily-eyed Ichigo blinking at her in confusion.

'Rukia?' he asked, his voice deep with sleep, 'is everything okay? It's three in the morning.'

'Yeah, sorry,' Rukia grinned and walked past him into his space. The room was small, a desk pushed up against the back wall, close to the balcony doors, and a couch where a pile of books lay sprawled, some having fallen to the floor.

'Well, come on in,' Ichigo huffed sarcastically, closing the door behind them and locking it.

Rukia removed her shoes, breathing in his scent that permeated the space. The closer she got to her cycle, the more she could smell. Ichigo's scent had always been comforting to her, but she'd never reacted to it. Now she could detect the sweet notes of citrus and berries and something darker, something manlier underneath.

Ichigo didn't seem perturbed by her visit, he walked back to his bedroom and left the door open as he went inside and flopped back down on his bed. Rukia was happy that he'd upgraded since moving out, and now there was plenty of space for the two of them on it. Without waiting for an invitation, she stripped down to her underwear and slipped one of his t-shirts on. Ichigo only stirred again when she slid into bed beside him.

He didn't ask what she was doing, it was universally understood that Rukia just did whatever she wanted and Ichigo just put up with it. Instead he slipped to the side to give her room. His scent engulfed her, it clung to his sheets and pillows and Rukia sighed in content, burying her face into the soft fabric.

This was her safe space.

She hadn't realised how much she'd needed it, until she was here.

The truth was, that very few people in the Seireitei knew that Rukia was an Omega. She was very good at hiding it, and during all the wars and battles they'd faced, her cycles had stopped, to the point she was convinced she'd just become a Beta.

But lying here in Ichigo's bed, listening to the steady deep breaths of the Alpha beside her and smelling his scent around her like a comforting embrace, Rukia had never wanted to be more Omega in her life. Ichigo had joked with her a few times, that she must be an Alpha, because of how often she'd beat him up, and the other ways she showed her dominance over him. For an Alpha he really was quite submissive.

'Ichigo?' Rukia asked, tentatively.

'Hm?' he was half asleep and his reply was muffled.

'I need to tell you something.'

Ichigo lay still for a while, then mumbled, 'go ahead. You woke me up, might as well keep me awake too.'

Rukia laughed lightly, but ignored the jibe.

'I'm an Omega.'

He was silent for so long, Rukia wondered if he'd fallen back asleep. Rukia laid there, not really worried one way or the other about how he'd take the information. To him, she'd still be Rukia.

After a few minutes, Ichigo rolled back over and Rukia found his eyes in the dimly-lit room with the only light coming in from outside the window. It spilled across his face, making his features sharper and his hair look darker. His eyes were thoughtful, like he was digesting the meaning behind her words.

He'd often asked her, in the two months where she stayed with him in the world of the living, but Rukia had always rolled her eyes and stepped on his toes.

'Why are you telling me now?' he asked, his brows pulling together.

Rukia just looked at him, trying to communicate the obvious silently so she didn't have to say anything out loud.

However Ichigo wasn't known for being astute. Rukia could feel her heart starting to beat a little faster. She and Ichigo had always had an usual relationship, closer than most, but there had always been an unspoken line that neither of them had crossed. They'd toed it on occasion, but Rukia felt like she was poised on the edge of it, ready to take the dive.

He didn't speak, instead his hand reached out to her under the covers, his fingers wrapping around her waist, he pulled her closer beside him. Rukia went willingly, her eyes still on his, digesting the emotions now swirling behind the hazel irises. In the darkened room, he looked closer to his hollow than himself. The bright vivid autumn colours she'd come to associate with his hair and eyes and smile were lost, but the scent that washed over her was undeniably recognisable and comforting. His reiatsu curled around hers, entwining and making her relax. She wasn't as scared to submit to him, if she had to. It was Ichigo, and he'd not do anything that would hurt her.

'Rukia,' he murmured, his voice lower than she'd ever heard it, his nose dipping down into the crevice of her neck and shoulder where he breathed deeply. Rukia shuddered against him, his chest moved to lean over her, pressing her back into the mattress. She wound her arms around his naked torso, feeling the beautifully sculpted muscles of the man he'd now become and bared her throat to him.

Greedily, he drank in her scent. His nose pressed close against the scent gland on her throat which had never emitted more than her baseline scent, but was likely now emitting pheromones and telling him that she was ready to mate.

It embarrassed her slightly, to know she was being so vulnerable with him. Rukia disliked showing weakness to anyone, even her friends, but she and Ichigo had already seen each other at their weakest points.

Ichigo didn't seem to be in any rush. He stayed where he was, breathing her in, while Rukia gently ran her fingers up and down his back, feeling the dips in his spine and the many battle scars. She could smell his scent growing stronger too, in response to her own. It was thick, the tang of citrus on the back of her tongue filling her stomach with warm butterflies. After a few more moments of their silent exchange, she could smell the shift in his scent, the arousal that had started to course through his body. One of his hands dipped under the fabric of the shirt she wore, running up the side of her body and stopping just below her breast.

'Ichigo,' Rukia breathed his name into his ear, and it made him stir.

'Are you sure?' he swallowed thickly, 'Rukia if we start… I…'

'Might not be able to stop?' she smirked into the dark room. Ichigo pulled away from her, his eyes locking with hers. It was hard to see the emotion in them now, his head blocked the light that filtered in from the window. His pupils were blown, dark with his own desire. For an Alpha he was showing incredible levels of self-restraint.

As they stared at each other, distant sounds of the world outside could be heard. The far-off shrill of a siren and a plane as it made its way across the sky.

'I'm sure,' Rukia said finally, her right leg straightening out under the duvet to allow him room to move between her legs, 'it's always been you, Ichigo.'

Ichigo's jaw tightened, his reiatsu curling protectively around them, enveloping her in a safe layer of his power. He dipped his head and caught her lips. Rukia pulled him closer, her hands, which had been exploring his back, pulled his chest toward hers, one of her hands slipping up into his hair.

The kiss was tentative, new, yet familiar. They started with a gentle press of the lips, then Ichigo coaxed her mouth open and Rukia granted him access. As his tongue slipped into her mouth, he shifted himself in the bed, slipping his pelvis between her legs. Rukia raised her right leg again, bracketing him between her thighs so he had nowhere else to go. Ichigo seemed content between them, his tongue gently stroking hers until she gasped for breath. When they broke apart, Ichigo thrust his hips forward and Rukia groaned. She could feel the bulge of his hardening erection through the thin fabric of her pants and his boxers. Spurred on by her groan, Ichigo continued, effectively grinding himself against her. At a point, Rukia hooked a leg around his waist to hold him in place, rubbing off him where her clit got the most friction.

'You know,' Rukia shuddered, her words muffled by her own pants, 'this would be a lot more fun if we weren't wearing anything.'

It was the first time she heard Ichigo growl.

He'd come close during battles, when he screamed his defiance, but this was different. This one was low, throaty and it did things to her.

For one thing, it shut her up. Rukia snapped her mouth closed, comprehending the tremor that ran down her body as the rumble in his chest continued. He nuzzled his way back toward her throat gland and latched his lips onto it. Her eyes rolled, and with a gasp she fell back against the pillow, her body shivering underneath his. His teeth scrapped along the sensitive flesh and his tongue followed to sooth. The tremor made her hands shake as she tried to explore his vast torso, she dipped her fingers lower, aiming to make him move faster.

'No,' he growled the word, grabbing her thin wrists in his hand and before Rukia knew it, had them both pinned above her head. 'I'm doing this my way.'

Rukia could do little more than whine at his words, her legs parting with need as he ground himself against her once again. She was throbbing between her legs, her nipples erect under his shirt and aching for attention, but the last thing she would do is beg.

Ichigo took his time. He explored her throat with his lips and tongue, raising his head to kiss her every so often. It was strange to taste her own scent, thick on his tongue, but she got used to it. After a while his grinding ceased and he moved his hips back to slip his free hand between her legs.

'You're so wet,' he groaned against her neck and Rukia grinned. His tone made it clear that he wouldn't hold out for much longer. He stroked her through the damp underwear, and Rukia bit her lip to stop herself from moaning his name. Then he pushed the fabric aside and slipped one finger effortlessly inside her.

'Fuck,' Rukia gasped, her back arching off the bed and her nipples scraping against his chest. The fabric on her sensitive skin with his finger pumping in and out of her made her shudder. Spurred on by her reaction, he pulled his finger out and inserted two in its place. There was almost no pain, her need and lubrication had dulled the stretch of his fingers and all she wanted was more. More of him, more of them, she wanted all of him. Rukia knew if she made any vocalisation on the matter or tried to hurry him along, he'd slow everything down. There was nothing she could do but lie there and take it.

Eventually he pulled back, the covers being thrown off and his chest glinting in the light of the city outside. Rukia could see the delectable glistening of his own scent glands, the smell of him was thick and heavy in the room. Her muscles twitched and she strained against her pinned hands, trying to buck up into him. Ichigo was staring down at her, curling his fingers inside her and sending shivers of pleasure coursing through her veins. She panted and squirmed in the bed, not appreciating the twinkle in his eyes that meant that he was enjoying toying with her.

Unable to use her hands, she raised her leg and pressed the inside of her calf against the strained shape in his boxers. A hiss slipped from his lips and he closed his eyes, grunting as she did it again. The length that lay hidden just out of view was impressive, the feel of him told her that he was fairly well endowed. In the dark light, she could just make out the tip straining at the waistband of his boxers, desperate to be released.

Oh god, she wanted him.

The shock of the realisation sent another shiver down her spine, her hips moved in circles, desperate for some kind of friction that they weren't getting. Ichigo slid his fingers out of her, they'd stopped moving when she'd begun to stroke him, and he pulled her pants down in one swift motion, tossing them off into the bedroom somewhere. He released her hands, finally, to tug his own boxers down and Rukia watched with rapt attention as his erection was finally freed. He rolled over, so that it hung hot and heavy between his legs. Rukia stared as he crawled back over her and he smirked.

'Like what you see?' he asked.

'Is every hair on your body ginger?' she asked, mostly to deflect embarrassment away from herself and direct it toward him. It worked, even in the dark, Rukia could see the angry red flush climb up his neck and spill along his cheeks.

He clearly had no retort, so he just brought his lips down heavily against hers, crushing her words back into her mouth. Rukia smirked in victory against his lips, but her thoughts soon stopped when she felt him guide himself to her entrance. She did her best to relax, letting her legs fall to the side and angled her pelvis up to meet him. Ichigo pulled back, his breath panting across her lips and she felt the head of him press against her. For a few moments it felt like he wouldn't breach her walls, but the added lubrication helped him, and the tip of his dick eventually slid passed her barrier. Rukia's neck snapped back and she gasped into the room, feeling the stretch of her walls as she accommodated him. She could feel every inch as he slid inside.

It felt like her entire body was on fire, and she looked up to see him gazing down at her, snapping his hips forward the last few centimetres until he was fully sheathed.

Whatever the invisible line was that had always sat between them, it was now nothing but a spec in the distance for how far over it they'd tumbled. Ichigo's eyes never left hers, his hand cupped the side of her face and his thumb gently stroked her lips, the expression he had was so full of tender care that Rukia thought herself an idiot for not realising sooner.

Ichigo had always loved her.

'Ichigo-' Rukia started, but he interrupted her.

'Don't speak,' he sighed, 'just- just let me have this.'

Rukia wasn't sure if he'd expected her to say that she didn't feel the same way. How could she? When she'd been the one to run to him, accepted him so fully inside her, trusted him, with every ounce of her being?

But then, people often hooked up, so she supposed she couldn't really blame him for thinking that way. Her thoughts ceased as he drew his hips back and snapped them forward again, causing Rukia's mouth to fall open and gasp. Intoxicated by her responses, Ichigo continued and soon Rukia could do little more than lie there. Each snap of his hips sent waves of pleasure coursing down her spine and soon his hands grew adventurous, slipping under her shirt and bunching it up her chest until he cupped her breast and began to abuse it with a calloused thumb. Rukia squirmed, her hips, doing her best to meet his thrusts and panted against his ear. In truth, she was fully content to lie there and take him, doing nothing but enjoying the feel of his cock dragging in and out of her, but she didn't want him to get the idea that she was a lazy lover.

Rukia hooked her leg around his waist, she didn't have the mental capacity to flip them, so she could ride him, but it was certainly an endeavour she hoped he would entertain in the future. Instead she used her new angle to lift her pelvis off the bed, allowing him deeper access as he thrust back into her. Ichigo's hand caught her leg, holding her in place as he was reduced to grunting against her ear.

She could smell how close he was to release, it was all Rukia could do to dig her nails in and hold on. Eventually their mouths found each other again, a clash of teeth and tongues and lips as they panted heavily against each other.

'Rukia, fuck, I'm going to…' he grunted. Rukia knew exactly what he was asking, knew exactly how this would finish. She wasn't ready to be knotted by him yet, she'd save that experience for when she was fully in heat, but she pulled back and twisted her head so that her lips were close to his ear.

'I want to feel you come inside me, Ichigo,' she groaned.

Apparently, that was all it took. With a growl of longing, Ichigo curled in on himself, his final thrust driving deep and Rukia felt him release inside her. Something about the feel of him coming had her pinching her own nipples hard and throwing back her head, her walls milked him dry as she came immediately after.

They lay in the afterglow for a while, Ichigo lying on top of her, but bracing himself on his arms so he didn't crush her. Rukia tried to keep reasonable thoughts at bay long enough to enjoy the moment, but eventually her mind supplied the unhelpful realisation that she'd smell like him for at least a week now that he'd come inside her.

'Fuck,' she sighed.

'Hm?' Ichigo's voice mumbled in content.

'How am I going to hide your Alpha scent from my brother?'

'That seems very much like a you problem,' Ichigo grinned against her neck, teasingly.

Rukia pinched his ass, hard and with a yelp, he squirmed off her.

'Don't think that because I let you screw me, I'm not in charge of this relationship,' she glared at him and Ichigo grinned back, rubbing the back of his neck and baring it, submissively. 'That's better,' she sighed.

'You could just stay here for the whole week,' Ichigo smiled, 'you're going to be going into heat soon anyway,' he pointed out.

Rukia rolled her eyes, 'if I stay here with you and we have more sex that will only make my position with my brother worse.'

'Does the great Kuchiki clan not approve of me?' Ichigo grinned, sliding back in close to her and pulling the covers with him to offer them to her. Rukia took them and wrapped them around her naked waist, grateful for their warmth and scent.

'Don't be stupid,' she rolled her eyes, 'you've saved the world so many times now, how could anyone not approve of you?' Rukia pointed out, but she chewed the inside of her cheek, 'my brother doesn't though.'

The triumphant smirk on Ichigo's face faltered and slid off it.

'Why?'

'He's worried our kids will have ginger hair,' Rukia teased and Ichigo scowled at her. She laughed, unable to help herself from trying to lighten the mood, 'I'm kidding. I think your constant disrespect of calling him by his first name hasn't been helping your case.'

'Fine, next time I see him, I'll call him Big Bro Bya instead,' Ichigo rolled his eyes but there was a hint of a smile to his words that had Rukia genuinely fearing that he was telling the truth.

'Don't you dare,' she glared at him.

'Stay with me,' he pleaded, his hazel eyes beseeching cutely under his fringe of orange hair.

'Fine,' Rukia pointed to him with a finger, 'under two conditions.'

'Name them,' Ichigo grinned, his smile flashing blinding teeth against his olive skin.

'Number one, you call Byakuya "Captain Kuchiki" until he tells you otherwise,' Rukia said, 'and number two, next time we have sex I get to ride you.'

Whether Ichigo agreed to Rukia's terms or not, remains to be seen, for after her last sentence he threw himself at her with such vigour that the two were entwined until the sun rose.

Feel free to leave me some prompt ideas in comments, I might not use everyone's but if they spark a good idea I will :D thanks for reading