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It took a while for Izuku to realise that he couldn't remember a day when Kacchan wasn't in his life.
Childhood memories were beginning to blur at the edges, as they always did with the years, yet even before he knew they hadn't stretched back that far. They'd been only just toddlers when they'd met officially, day one of preschool. Kacchan had tried to wrestle the orange crayon from him because he needed it to draw his 'super cool awesome hero outfit that's way better than yours.' Izuku had clung tight, because Kacchan already had the yellow he wanted for All Might's hair, so this was the closest he could get. A scuffle ensued, then shouting, then crying from the both of them. They were placed on time out.
And somehow, Izuku found himself trailing after Kacchan in the playground the next day.
The other kids were weary of the both them at that point, although eventually some would work up the courage to approach Bakugou - not friend really. More lackeys. But for a while at least, it was just the two of them. Some of Izuku's fondest memories were of those days.
Even after their friendship fell apart, Izuku didn't think a day went by without seeing him. When he'd finally made the choice to stop following - given up hope of those early days ever making a return - Kacchan was still there, in his classroom, behind or in front or just across from him. He didn't try to approach, and they never spoke, Izuku staring from afar and remembering. And stepping in, when the other kids started to get stomped on.
He'd longed for the days of sidekick, instead of enemy.
In retrospect, there was no doubt he'd get into UA, because not making it in meant being separated from Kacchan, and that was something the universe didn't seem to allow. After all those years chasing him, there was no way he could stop at this point. Through first year, through their exam together, through sports festivals and internships, to the point where they were at the same agency, in the same classroom, taking the same walk home during break.
Kacchan hadn't kept so much distance from him, that time.
The distance had thinned further as the year came to an end, as conversation started up again. The first time they'd spoken, casually, waiting outside of class, was the time Izuku felt like he was home again.
And the days continued. And Kacchan had been there. Had been there when he graduated, had been there when the agency took both of them on. As a duo.
Had been there for their first assignment and their first villain fight as sidekicks and the first time Izuku was wounded so badly they hadn't known, no one had known, and Kacchan held him in his arms so tightly as if that alone could keep him from falling.
Countless days of weeks of months of years, and everyday the same face, a forever constant.
Something kicked him in the leg, pulling him out of his reverie, and he turned to see Kacchan shuffle in his sleep beside him. A tiny smile gracing his lips, he leant over, pressing a kiss to the nest of messy blond hair. "Morning."
"Fffffuck off," came the grunted reply into the pillow, Kacchan lazily swiping at him, and Izuku laughed, catching his hand to hold it.
Not just everyday now, but every morning too, and every night, and every evening. The time their work kept them apart, they more than made up for. Together, they made a home.
Izuku settled back down beside his boyfriend, threading his fingers through his, deciding they had some time. The rest of his life, or so he hoped.
A lifetime to spend more days with Kacchan.