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The first night they spend together, Katsuki tries to write off as an accident. Tensions have been high between them lately, and it was only a matter of time before something happened, and Izuku can’t say that he’s really surprised by what did happen. They have never been just friends, and never were anything less, and he knows that, and Katsuki knows that, and still, he tries to write off the first night as an accident.
The second night, he won’t make eye contact, before or after, and barely at all during. He doesn’t want to admit to even himself that it’s happening again, that it wasn’t just an accident the first time. Katsuki has never wanted to acknowledge the part of him that actually cares for Izuku, and even if he can still call this a casual thing, and pretend it means nothing every time, it still puts him one step closer to not being able to ignore the truth anymore.
By the third night, Izuku knows that Katsuki is fighting tooth and nail not to acknowledge what is happening between them, and he doesn’t say a word, other than what is necessary. This is becoming a regular thing, even if neither of them will say what it really is. Izuku doesn’t want to push Katsuki too hard, and he is happy with what they have for the time being.
Every morning after, Katsuki insists that this is never going to happen again, but on the fourth night, Izuku is very glad that he is not to be taken seriously. And after that, it becomes hard to keep count, as the nights bleed into each other and they don’t really take any time apart, but every morning after, Katsuki says it’s done, it’s over with, it was all an accident, and it’s so impossible to believe him when they’re this far into things.
“Fuck it, just one more night,” Katsuki says sometimes, and that phrase has become just as hollow as his morning promises that it’s over. One more night turns into another and another, and even if he isn’t saying anything, it’s getting to the point where he doesn’t have to. Izuku knows him well enough, and he used to wish for one more night, but now he doesn’t have to.
It’s already guaranteed that he’ll get one, because Katsuki is just as attached as he is.
“Fuck it, just one more night,” he says, and Izuku replies, “And maybe more than that,” just to watch the expression on his face.
Because it is never just one more night, and it is never the last morning, and someday, they’re going to have to face facts, but they’ll have many nights between now and then.