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Since the day they came out of him, Toji had always known that his children were bound for greatness. Given their parentage, one wouldn't expect less from them.
Megumi and Yuuji were born holding hands - literally in this sense. When Toji and the midwives realized that he couldn't give birth to his children due to a breach or complication on his birthing futon hours into labour, a C-Section had to be performed on him under the watchful eyes of Sukuna and Uraume. When he was cut open, the problem was clear as day.
Megumi, Toji's beautiful black haired Alpha baby, had been clutching the hand of his younger sibling, Yuuji, Toji's beautiful Omegan son. Even when they had to be cleaned up of the gunk on their skin, Megumi refused to let go - the babe having a heavy scowl on his red and wrinkle face that spoke of the Ryoumen and Zen'in bloodline in his veins. His husband made a comment about how powerful his first son was and a tired Toji just rolled his eyes at his husband.
Toji had cradled them to his chest after Sukuna had closed him up with his technique and after his babies had been cleaned and wrapped in embroidered blankets. He had looked down at his boys as they suckled on his engorged breasts, their mouths holding his sensitive nipples tight, and just like his husband, he had seen that they were destined for great and powerful things.
Megumi and Yuuji had been close to the hip since they came into existence. If Yuuji wasn't beside Megumi, the tiny baby will scream up a storm and the entire estate would feel his wrath. It was due to this that Megumi's Cursed Energy and Techniques manifested at just the tender age of one year old when Toji had tried to separate them into different rooms. Sukuna had been the proudest Toji had ever seen.
The Omega had watched in exasperation by his grinning husband's side as his son's Shadow Demon stole his younger son from his separate crib and gently carried him over to the fussing master. Yuuji had been giggling the whole way - limbs flaring as he gazed up and grinned at the deformed, dark entity as if he knew it was taking him back to the side of his older twin.
Megumi adored his baby brother, that could be obviously seen. Yuuji was the apple of the Ryoumen-Zen'in household. Both his mother's and father's clan weren't quite merciful to anyone who dared to harm the little Prince. Examples could be seen by the way the assassins sent after him and Megumi were dealt with.
People thought Sukuna was the most frightening parent just because he was the infamous King of Curses, but they haven't seen Toji truly losing his shit when it came to their children. The amount of times Sukuna had to calm his ferocious Omega down from killing a maid or two just because they got something wrong when it came to the children's care. Even though their marriage was arranged, the two saw eye to eye in various things, most especially the safety of their children.
The twins started their training early under the supervision of their parents. As the Princes of their realm, it wasn't a walk in the park. Their lessons, both studies and martial, were brutal. Toji honestly feared that his youngest son, who was softer than his oldest, wouldn't be up to the task - but Yuuji surprised him. Toji had to keep reminding himself that Yuuji was a Ryoumen-Zen'in as well and shouldn't be underestimated just because he was bright and bubbly.
As the years went by, so did the ages of the Ryoumen-Zen'in twins. Megumi and Yuuji grew up to be beautiful and breathtaking - outshining everyone. Toji could see that Megumi would look a lot like him when he hit adulthood, and most possibly Yuuji as well when it came to body build.
Megumi grew up to have Toji's vivid emerald eyes, black hair and pale skin - but his hair was spiky as Sukuna's. He possessed the stoic nature of both his parents, and his once in a while insanity and unhinged bloodlust from them as well. He was a powerful heir to Sukuna's empire, ruthless to everyone but his twin, who was the only one who could get a smile from the scowling and stoic teen.
Yuuji grew up to have Sukuna's skin tone, his unruly pink hair, slits under his eyes and tattoos on his body except his face (which manifests when he used his Domain Expansion like Megumi). He got Toji's emerald eyes (a hint of red shining in them) and the undercut of his hair was black. Toji honestly didn't know where his Omegan son got his bubbly personality from, but the only explanation he could cook up was that Yuuji behaved the same way whenever he and Sukuna were amused by the struggles and sufferings of lower filths.
Toji loved both of his children equally, even though he had a hard time showing it. They were his world, seeing as he couldn't bear another child again after them. Heck, even conceiving them had been a difficult experience, and honestly the Omega had feared that Sukuna would open up the doors for a new harem after dissolving the previous one years ago for Toji's sake. He had feared that after ten years of trying so hard, Sukuna would have gotten tired of him and gotten another Consort - but the four armed Curse had been in no rush to have children. After all, he was immortal.
As the heir of the empire, Megumi was expected to find himself a suitable bride, seeing as neither Sukuna nor Toji were keen on forcing anyone on him. As the years went by, Toji came to the conclusion that maybe his son might be asexual or aromantic, seeing as he never showed any interest in any of his cousins or Sukuna's loyal men and women. But Toji was proved wrong.
One day, Toji had been making his way through his children's wing of the estate in a surprise inspection of the estate. Even now as teens, the twins refused to be separated and their rooms were located in the same wing. The Omega paused in his steps when his children's scents assaulted his noise. As he got closer to Megumi's room, the scents became stronger and he could hear the moans and grunts coming out from there.
Toji had slowly and silently opened one of the fusuma doors and was blessed with the sight of his seventeen year old children fucking like animals in heat.
Megumi had Yuuji on his belly, forcing his slightly smaller brother into a breeding press and was pounding away - his face buried in the croak of Yuuji's neck and two of his left fingers in Yuuji's mouth. His pink haired son looked utterly ravished - his tongue lolling out, tears sliding down his flushed cheeks and his eyes rolled into the back of his head in his fucked out state.
Yuuji was letting out cute moans and cries, his fingers clawing at the sheets and his toes curled. The lewd sounds of skin slapping on skin and wet squelching noises as Megumi's cock rearranged Yuuji's inside, molding it to his desired shape and no doubt hitting Yuuji's prostate and cervix head on, were loud and obscene.
"Nii-chan! Nii-chan! Megumi-nii~" Yuuji cried out, panting loudly as his older brother made a complete mess of him. "Cumming! I'm cumming again!"
Toji was frozen in shock, transfixed by the scene playing out before his very eyes.
"Good boy. You're so good to me, Yuu." Megumi crooned, placing a kiss on Yuuji's shoulder. His fingers let go of Yuuji's tongue and that hand made its way to Yuuji throat and wrapped its fingers around it.
If Megumi wasn't completely caging Yuuji, he was now. There was no way Yuuji could escape what was coming. At that moment, Toji could see the resemblance between Megumi and Sukuna when in the throes of unadulterated pleasure.
"You're so perfect around me, Yuu. So tight! So wonderful." Megumi loudly groaned out. His deep moans joined Yuuji's, the Omega's pitch getting higher as he reached his climax. "That's it. Cum for nii-chan. Cum on my cock."
With a wanton and rather loud scream, Yuuji came - his cum spurting below him. His body began to shake harder as Megumi kept on fucking him through his orgasm. It didn't take long for Megumi to cum as well, and with a loud groan that sounded almost like a beastial growl, Megumi reached his peak - filling up Yuuji's womb with his seed as he clamped his teeth on Yuuji's shoulder, almost close to his Mating spot.
A thousand thoughts were running through Toji's mind as he stood there. He must have made a sound because he suddenly had Megumi's cold eyes on him. The Omega watched as his son's emerald eyes took on a familiar glow that had the red in them coming out as he activated one of his techniques.
A puddle of darkness formed a step away from Toji's feet and from it a skeletal hand that had some stripes of flesh burst out, causing Toji to instinctively move back. The hand grabbed hold of the door and slammed it shut in Toji's face. The Omega stared at the closed door in bafflement. It took some moments for him to gather himself and he made his way to where Sukuna was relaxing.
When Toji informed Sukuna of what he witnessed, the Curse threw his head back and released a booming laughter. Toji just sighed in exasperation.
"He truly is from my loins!" Sukuna cackled out. "I knew that possessive nature of his had a dark side. To think he has already claimed Yuuji!" He cackled again.
Toji took a sip of his tea that Uraume had served, allowing the herbal beverage to warm him up in the slightly chilly afternoon. "You should have said something if you had suspected about their relationship sooner." He gave his husband a light glare.
Sukuna chuckled. "And ruin the surprise? No, my Beloved, it was better for you to find out this way. Your reaction was quite entertaining."
Toji scoffed. "Still an asshole as always, Husband." He muttered behind his cup.
The Curse, who was currently in his smaller form, grinned rougishly at him. Sukuna had his chest open and bare as always, his white kimono slipping off from his shoulder as he laid on the mini bed sideways.
"What did you expect from my children, Wife? They were born together and as such belong together. Yuuji was created for Megumi, to be his bride and mother of his children - just like how you were created for me." Sukuna reached for Toji's face and caressed the scar on his Omega's lips with his thumb. "Together, those two are unstoppable and their children will be extremely powerful. I fear that I might have a hard time defeating my grandbrats!" He cackled, drawing a snort from Toji.
"That's if your ugly ass face doesn't scare them to death at a young age." Toji gave him a roguish grin, getting a laugh from the King of Curse.
"If their parents survived me, then they won't have any problem!"
"Hm." Toji hummed, taking a sip of his tea. "They grew up too fast." The Omega heaved a sigh, a small displeased frown on his face.
"Keh. Then I better perform my duties as an Alpha and give you more then~"
Before Toji could could stop the lecherous grinning Curse, he was already cornered. Sukuna took his almost empty cup of tea and threw it away, not caring that the china broke. He proceeded to rip away Toji's yukata, exposing his beautifully scared Omega to his eyes. Toji's tune soon changed and it didn't take long before he was moaning and begging Sukuna for more.
Uraume quietly left their masters to their activities in the gazebo, the other blushing servants hurriedly following after them.
The next day saw the family of four having a meeting.
Both Yuuji and Toji had visible love marks on their exposed skins and the two if them were sitting on softer and large pillows.
Megumi and, surprisingly, Yuuji, both bore determined looks on their faces as they faced their parents. Their shoulders touched as they sat close to each other.
"When did it start?" Toji, not one to beat around the bush, asked after some moments of tensed silence.
"Since we were seven." Yuuji was the one to reply. The teen had a fierce look in his eyes, unafraid to look his parents in the eye. "But we started having sex when we turned thirteen."
All Toji could do was sigh. Beside him, Sukuna - who was sitted like a ruffian - grinned at the confirmation of his suspicion.
"Where you two ever going to tell us?"
"Yes. After I got Yuuji pregnant with my child." Megumi was the one who replied his mother this time. "I planned to trying to impregnate Yuuji in his incoming Heat that's a month away, and you two would have been told that not only were you going to be grandparents but also about our relationship."
Sukuna chuckled at that, his red eyes gleaming with pride. "You truly are my son."
Megumi gave him a sharp, toothy smirk.
"What if your plans would have been squashed by me giving your brother out for marriage? What would you have done?" Sukuna suddenly asked, cocking his head.
"Sukuna." Toji said with a stern voice as he glanced at his husband, annoyed by his very words. He noticed Yuuji going tensed and he didn't like it one bit.
Megumi bared his teeth in a snarl, his eyes glowing in rage at the prospect of his father taking away his Omega. "Then I would have killed you. I'll kill you where you sit if you so as much as think you'd succeed in doing that."
"Megumi!" Yuuji reprimanded.
An unhinged and demented expression took over Sukuna's face, his four eyes shining with amusement. "Are you challenging me, boy?"
Megumi's usually stoic face twisted into a similar expression, the red in his eyes coming out more.
In a flash, both father and son transformed into their secondary forms, their kimono and haori ripping, leaving them only in their hakamas. They towered over their Omegas in their four armed forms.
Megumi, whose tattoos were now visible and he now bore four eyes (the upper set emerald and the lower blood red), wasted no time in dashing after his father, delivering a punch that saw Sukuna bursting through the walls and making his way outside. With a growl, Megumi followed after him.
Toji heaved a resigned sigh whilst Yuuji face palmed in exasperation.
Toji picked up his tea and took a sip. "So... when do you two plan to Bond?" He gave his youngest son a rare soft smile.
Yuuji beamed at him, happy to have his mother's approval. "After my Heat, Mama! Nobara-chan, Maki-san and I have already started the decoration plans!"
Whilst the two Omegas talked about wedding themes and whatnots, the two powerful Sorcerers in the realm continued to battle to their hearts content, rearranging the landscapes to their wishes.