The late afternoon sun cast a golden glow over the playground, children’s laughter blending with the rustle of leaves in the breeze. You sat on a bench, your four-year-old daughter playing happily in the sandbox, her curls bouncing as she shaped mounds of sand into castles. It was a rare peaceful moment, one amidst the chaos of raising her on your own.

Katsuki had been a constant in your life—a best friend and unwavering support since your daughter’s birth. His presence was so familiar that your little girl had started to believe he was her father. You hadn’t corrected her; the way she lit up when Katsuki entered the room, the unspoken joy he felt around her—it felt too precious to shatter.

Across the street, a familiar figure in his hero costume came into view. Katsuki was on patrol, his crimson eyes scanning the area with his usual intensity. Your daughter, perched on the edge of the slide, froze mid-climb when she spotted him.

“Daddy!” she squealed, her voice ringing out over the playground. Before you could react, she was off like a rocket, her tiny legs carrying her toward him.Your heart leapt into your throat as you scrambled to catch her. But then you saw who had caught her attention—Katsuki, in full hero gear, patrolling the area. He turned at the familiar voice, his crimson eyes widen in surprise as the little girl ran into his legs, wrapping her arms around him.

“Daddy!” she exclaimed again, her voice filled with joy as she looked up at him. Katsuki expression softened, as he crouched to her level, gently patting her head.

“Hey, kid,” he murmured, his voice unusually tender.

You finally caught up, your cheeks flushed with a mix of embarrassment and affection. “I'm sorry… she thinks you’re her dad—”

“I don’t mind,” Katsuki interrupted, standing up and lifting your daughter into his arms with surprising ease.

Your heart swelled as he carried her back to the playground, her giggles echoing in the air. Katsuki wasn’t her dad, but in that moment, he might as well have been.