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The sound of Sukuna's knuckles against your apartment door echoed through the empty hallway. His jaw tightened with irritation the longer it took for you to open. He knew damn well you were in there, music from some children's show blaring from inside, the patter of small feet running around the floor accompanied by giggling. You'd never leave your son alone, so what the hell was taking you so-
"...Can I help you?"
A vein bulged under Sukuna's forehead as he stared at the ugly ass man who had unlocked the door, not the beautiful woman who he once called his girlfriend, the mother to his child.
He was tall; not as much as Sukuna though, he noted as a small triumph. Lean muscle flexed through his whorish compression shirt, abs peeking through where it slightly rode up above his gray sweatpants. White locks of hair fell like a mop over piercing blue eyes and his stupid mug as he lazily looked Sukuna up and down like he was the intruder.
"I'm here for my son," Sukuna gritted out, not wanting to find out who the man was, quickly realising you'd kept yourself real busy since the two of you broke up. "Can you get the fuck out of the way, I need to pick him up for the weekend. Where the hell is his mom anyway?" He craned his head to peer inside, growing more irate by the second.
"Ahh, you're Sukuna," your new boytoy, Sukuna assumed, grinned, knowing, still annoyingly in the way. The casual use of his first name grated on Sukuna's nerves. "I'm Gojo. She told me a lot about you, you know." Sukuna didn't know if he felt elated or suspicious at the idea.
"Yeah I'll bet," he replied sarcastically. He barely keeping the aggravation out of his voice, not deigning to respond to his introduction. "Can you fucking move already-"
"Daddy?"
He better have been talking to me, Sukuna thought.
Eyes just like his gazed unblinkingly up at the two men hogging your doorway. The anger Sukuna felt almost entirely dissipated as he looked at the one (of two) remaining good things in his life.
Overwhelming affection swelled in his chest as he gazed at his child. There wasn't a single doubt he was Sukuna's son, having inherited almost every single feature from his father - from his spiky pink hair and his complexion to his unusual strength and large appetite.
Except for his smile.
That was all you. Sukuna was sure of it.
"Hey kid-"
"Heyyy buddy." The white haired freak, much to Sukuna's horror, bent down to scoop his son into his arms with a shit-eating grin before Sukuna could even speak. "You done watching your show? You hungry?"
"Mhm!" The boy nodded vigorously, already distracted from the fact that his actual father showed up for him. "Can you make chocolate chip pancakes again, Uncle Toru?"
Uncle? Toru???
Sukuna's stare darkened immediately as he watched the child he made with you squeal and laugh in the shoulders of another man. His fists clenched. Just who did this guy think he was!? You bring home your new flavor of the week and suddenly he's playing house with another man's son?
It was in times like this that he wondered if you ever thought about him at all since you dumped him. Was he truly such a hopeless case, that you wouldn't even think of getting back with him, but would let this - teenager, frankly speaking - barge into the life you started with him?
"Uncle Toru, you're so funny!"
The voice of his son snapped him out of his thoughts. The boy hugged Gojo's neck tightly, still giggling as the man bounced him. Gojo laughed right back, yet he was looking straight at Sukuna. His face was smug, his smile a little too wide and ingenuine as his eyes narrowed with the superiority he obviously felt.
It was almost like he was rubbing it in Sukuna's face; how comfortable he's made himself with his woman, his son; had cemented his place in their home. And he certainly wasnt planning on leaving any time soon.
Sukuna's eye twitched.
He always knew he was going to end up in jail at some point anyway. Might as well make it worth it. Sukuna didn't care. He'd kill this bastard right now.
Or he would, if you hadn't appeared right then.
"Oh my god," you muttered.
Sukuna would be lying if he said his heart didn't stop a little when he saw you.
You in a baggy shirt, tiny pajama shorts, hair still damp from your shower - the sight was enough to make him feel young, stupid, reckless and entirely in love with you all over again. Not like he hadn't tried to get over you. You were frustrating, stubborn, and had been a real pain in his ass sometimes. But you were also beautiful, overwhelmingly sweet when you wanted to be, and were once his.
"Hi, baby," Gojo grinned at you, not even bothering to hide his lecherous stare down your bare legs, and Sukuna's mood instantly soured again. He had almost forgotten he had competition now. His incredulity only increased as he saw you flush despite yourself. The two men gave each other the dirtiest side eye, failing spectacularly at subtlety.
The tension in your apartment at that very moment was almost oppressive. It was like watching a car crash in real time.
"Mama!" Neither your ex nor your boyfriend had the chance to address you as your son wriggled out of Gojo's arms and ran straight to you.
"Mama look, Daddy's here," he informed you diligently, hugging your thighs, looking up at you with wide eyes.
You stroked his cheek with your free hand, the other still drying your hair. The cringe on your face was hard to hide; as if you had any choice but to notice. "I know, my love."
As Sukuna watched his son babble excitedly as you refused to meet either man's eyes just yet, he steeled his own resolve. He knew he had fucked up by letting you go, but that was a mistake he wouldn't dare repeat again. He would prove to you he'd changed, had become the man you'd always known he could be. He was determined to earn your trust back and be the only man you'd ever need for the rest of your life, so god help him. Maybe this time, he'll actually put a ring on it too before you slip through his fingers again.
"May the best man win?" Gojo's low voice cut in, amused, mocking, not even facing him, his eyes lazily roving over you. Although his gaze wasn't just lustful anymore. It was possessive, devoted, assured of his place but still willing to fight for it. Letting out a scoff of disgust, Sukuna smirked.
"Oh, I will."