It was an overwhelmingly hot summer day. You and Sukuna had gone on a beach vacation, purely as a retreat, as life was getting increasingly stressful, and you needed an escape for it all. That aside, Sukuna's main motivation was seeing his lovely significant other in a bathing suit. He wasn't exactly worried about being caught either, because he was a giant eight foot tall man with four arms, who would dare to oppose such a threat? Stupid people, in his words.
The waves rolled in, crashing against the sand, catching and tossing adrift unsuspecting clumps of kelp, seagrapes, and shells. The constant hiss of the sand rolling with the tides was soothing, just loud enough to block out other people's conversations, while being just quiet enough for you to hear Sukuna's comments. Mostly he was grumbling about the sun being too hot, and other people getting too close for comfort, as well as glaring at any children who had the audacity to look at him, or you, for longer than two seconds.
You manage to catch his attention when he hears you mumbling about "Wanting to be in his Domain Expansion". Sukuna hums at the idea, rolling the words around in his head. You wanted to be in his Domain, in Malevolent Shrine? Typically that was a death wish, he couldn't think of a single soul who would want that for themselves. "That would kill you upon impact." He speaks quietly, just loud enough for you to hear, his voice that same low, smooth tone that seemed to seduce you every single time he used it against you to get his way.
"I know that, but isn't there some way you can make it not do that? I wanna see what it's like in there." You respond, eyeing him, constantly moving your gaze back and forth between him and the sand under your feet, searching for any good shells that catch your eye. "I can try, but I can't promise it will work." Sukuna sighs. Of course there was a way, and of course he knew how to do it with ease. He, naturally, just liked to rile you up, make you believe you were in danger, and that he was either the villain orchestrating the chaos, or the knight in shining armor, depending on his mood.
You go to move towards him, to see what would happen, but by the time you take the first step, he's already mumbled "Domain Expansion: Malevolent Shrine", thus putting the both of you in an eerily calm, yet strangely comforting area. The water and sky were blood red, the Shrine itself dimly lit up in blue and reddish hues. "This is beautiful." You whisper in awe, taking in your surroundings to their full extent. "That it is, my love." Sukuna replies, taking your hand and walking you to the shrine, where he takes a seat, sitting you on his lap to face him, completely dwarfing your height in comparison.
The only sounds were the water running quietly, and both yours and Sukuna's breathing. It was quiet, too quiet. "You seem... on edge." Sukuna observes, two of his hands holding your legs in place over his, while one rested on your hip, and the other stroked your cheek gently, moving in slow vertical lines. "It's too quiet. I feel paranoid." You explain, your eyes locking with his. His red irises peer into your own, reading your emotions with just one look. "I could do something about that, brat." He speaks quietly, already shedding his clothing, and tearing off your own. If there was one thing no one warned you about when it came to being in love with the King Of Curses, it was that he was somehow always incredibly horny, and just managed to conceal it with extreme self restraint.
The second his Kimono falls away, it's like an all-you-can-eat buffet. His large muscles and secondary mouth on full display, which is grinning back at you with its sharp teeth. "I want to eat you." You state bluntly. Of course, you didn't mean it how it sounded - To the average person, it would sound criminally insane, but to Sukuna, King Of Curses, practically the Devil Incarnate and King Of Hell, it was the highest form of praise, to know that he was desired so lustfully. "Is that so, brat?" He taunts, "Go on then. Eat me." He teases, pulling you flush against his sweltering flesh, urging you to just take one bite, one lick, something, anything, for you to take from him and occupy your absurd oral fixation.
Finally, you settle on latching your lips over his neck. It doesn't even faze him, in fact, he simply encourages you to try your damndest to consume him the way you wished to, which rapidly leads to him guiding you to your knees beneath him. He shoves his pants down just enough for both cocks to spring out, watching as they nearly hit your face. "Well, go on then. You want to eat me, to lick me? Do it. Unless, you're afraid?" He commands from above, a hand coming up behind your head and enrapturing itself within your hair, forcing you forward, easing one of his dicks into your mouth. "Good girl." He whispers, guiding your movements, forcing your head back and forth along the length of his cock. It doesn't take long for him to get bored of this, unamused with how simple it was.
Instead, he flips you over onto your stomach over his muscular thighs, two thick fingers plunging inside of you with little to no effort, making their way in without restraint. His thumb rubs tight circles on your clit, all four of his eyes taking in every jump and twitch of your legs. "I bet that feels good, doesn't it?" He speaks in a condescending tone, a weapon he used against you in daily life, to teach you inferiority and submission. After all, you were his partner, his lover, his wife - You were not his equal, far from it. In his eyes, you were little more than a pet, an animal to keep on a short leash. Or rather, an exhibit, something to toy with and wear down until it broke, just to reuse old parts to remake a better-functioning performance.
Once you clench and cum on his fingers, he removes them with a squelch followed by a soft "pop", watching in sadistic glee as you whine from the lack of stimulation, despite being overly sensitive as it was. "That's a good brat." Sukuna mutters, tossing you onto your back, easily sliding one cock into your still-pulsating pussy, his eyes fluttering shut in momentary bliss, before quickly regaining his composure. One hand held your wrists together above your head, while the other held your hips, forcibly bouncing you onto his dick with swift, fast movements. He then forces the second cock into your pussy, watching with pure satisfaction as you struggle to take both, knowing that it would certainly be a bloody mess afterwards.
After a few more minutes of his unrelenting pace, both you and him cum at the same time, the throws of deeply euphoric orgasms washing over both of you, forcing him to pause all movement, while your entire body locks up in full-body orgasmic paralysis, due to overstimulation. Once both of you come down from your highs, Sukuna shuts off his Domain, the surroundings returning to the peaceful, and yet, highly populated beach. Your bathing suit was fully intact, the only remnants of the encounter being the painful ache between your legs, paired with the marks and bruises, as well as bleeding, that such thorough sex wreaked upon your body.
"The fuck're you talking about? I never did that." Sukuna sighs as he helps you clean off under a warm shower stream in the bathroom of the beachside Inn you were staying at, his response being to your recounting of what happened. "You must've been swept up in a tide and swallowed too much water, because I have no idea what exactly you're saying to me right now. That never happened. Maybe you fell asleep and got sunstroke. Like hell I'd let a human, MY human, into my Domain without good cause." He huffs. Despite it all truly happening, he didn't want you getting too confident in yourself, because he didn't need a physical leash and collar to keep you in line, all he needed was to warp your concept of yourself, and you'd be practically tripping over yourself just to be dependent on him. And you knew that.