Chapter Text
The hallways of the "Purple Skies" luxury condominium usually smelled of floor wax and expensive air fresheners, but today, they smelled of cardboard and chaos.
Eight-year-old Seokjin stood in the doorway of Unit 401, his arms crossed over his chest like a miniature sentry. Behind him, six-year-old Namjoon was already retreating into their living room with a science book tucked under his arm, clearly unimpressed by the commotion. Five-year-old Taehyung, however, was vibrating with excitement, his face pressed against the doorframe as he watched the neighbors move into Unit 402.
"New friends, Hyung?" Taehyung whispered, his boxy grin already forming.
"I think so, Tae," Jin replied.
The elevator doors hissed open, and a woman stepped out, clutching the hand of a silver-haired boy. This was Jimin, also five years old. Behind them, a man carried a small, wide-eyed toddler—three-year-old Jungkook—who was buried deep into his father's shoulder.
The parents hit it off instantly, their laughter echoing in the hall as they recounted stories from their university days in Busan. But while the adults reminisced, the children began their own dance.
Taehyung didn't wait for an introduction. He marched right up to Jimin. Within five minutes, the two five-year-olds had discovered they both loved strawberries and superheroes. They let out a synchronized squeal and disappeared into the living room of Unit 402 to find the toy box.
Jungkook, however, was left behind. His brother—his constant shadow and only playmate—had just been "stolen" by the boisterous boy from across the hall.
Jungkook's bottom lip began to wobble. "Jimin-ie..." he whimpered, a fat tear rolling down his round, bready cheek. He looked small and incredibly lonely in the middle of a hallway filled with moving crates.
Seokjin felt a sudden, sharp tug in his chest. Seeing the toddler look so lost made him feel a sense of protectiveness that surpassed what he felt for his own brothers. He walked over and knelt down, his knees popping on the tile.
"Hey there, little one," Jin said, his voice dropping into that soft, honeyed tone. "I'm Seokjin. Are you hungry? I have banana milk in my fridge."
Jungkook sniffled, looking at Jin with enormous, watery eyes. He gave a tiny, hesitant nod and reached out a chubby hand to grab Jin's sleeve.
The Quiet Protector
As the months passed, the two families merged into one giant, chaotic unit. With both sets of parents working grueling hours to establish their lives in Seoul, Seokjin naturally stepped into the role of the caregiver.
Namjoon was usually in the corner of the living room, surrounded by books far too advanced for a six-year-old, demanding peace and quiet. Taehyung and Jimin were a whirlwind of noise, constantly playing "secret agents" or "dinosaurs" under the kitchen table.
But Jungkook remained in Jin's orbit.
Jin became the only one who knew exactly how Jungkook liked his snacks cut—into small triangles, never squares. One afternoon, Jin returned from school to find his bedroom door slightly ajar. He stepped inside and stopped, a smile tugging at his lips.
There was a small, dark-haired lump under his duvet. Jungkook had crawled over from his own apartment, found Jin's bed, and fallen asleep waiting for his favorite person. He was clutching one of Jin's school sweaters to his chest, his tiny nose twitching as he breathed. Jin didn't wake him; he just sat at his desk and started his homework, the sound of the toddler's steady breathing keeping him company.
Lessons and Little Hands
"No, Kook-ah, look at the paper," Jin murmured, sitting on the floor with Jungkook tucked between his knees. They were surrounded by colorful flashcards and wooden blocks.
At three, Jungkook was eager but easily distracted. Jin was teaching him his colors and shapes, his patience never wavering.
"What color is this?" Jin asked, holding up a red block.
"Wed!" Jungkook shouted, looking up at Jin for a reaction.
"So smart!" Jin cheered, ruffling Jungkook's hair. "And can you draw a circle?"
Jungkook furrowed his brow, gripping the crayon with his whole fist. He scrawled a shaky, lopsided loop on the paper. It looked nothing like a circle, but to Jin, it was a masterpiece. He leaned down and pressed a kiss to the top of Jungkook's head, noting the faint, sweet scent of baby powder that always seemed to cling to the boy.
The Night Watch
Because their parents were often at the office until midnight, Jin took charge of the evening routine. He would cook simple meals for the "littles"—usually rice and soft stew—making sure Taehyung and Jimin didn't create too much of a mess, and ensuring Namjoon actually ate instead of just reading.
But his most important task was bedtime.
Jungkook was afraid of the dark and hated being alone in his apartment when his parents were out. Almost every night, Jin would find the toddler standing at his door in dinosaur pajamas, dragging a blanket behind him.
"Hyung... sleep here?"
"Of course, Kook-ah."
Jin would tuck him into the side of his bed, climbing in beside him. Jungkook would immediately scramble closer, his cold toes searching for the warmth of Jin's legs and his head finding its permanent spot under Jin's chin.
As Jin looked down at the sleeping boy, he felt a strange, heavy weight in his heart—a silent vow that as long as he was around, Jungkook would never have to be afraid. He didn't know then that the world would eventually label him an Alpha and Jungkook an Omega. To eight-year-old Seokjin, Jungkook was just his, and that was all that mattered.