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The first time Katsuki tackles him to the ground, Izuku is sure his friend is angry with him, but then the blond starts nuzzling gently against his cheek before mumbling something like: "I'm tired. Haven't slept that much..."
Of course Izuku convinces him to stand up only for the two of them to stumble on the couch together. Katsuki sleeps for a while with his arms around Izuku's waist.
The next time he gets tackled to the ground doesn't make sense... Someone is about to give him a hug and Katsuki jumps at him before it happens.
The poor girl looks so disappointed.
"What are you doing, Kacchan?" He mumbles, noticing that one of the explosive boy's hands is on the back of his head in order to protect him from the fall. He tries not to find that sweet because Katsuki just scared someone off. "She needed comfort..."
"No, she didn't," the other boy growls, before burying his face in the curve of Izuku's neck. "She just wanted an excuse to hug you."
"That doesn't make any sense, why would she–"
"Shut up, nerd," Katsuki cuts him off, irritated, although he melts into Izuku's arms.
His friend keeps tackling him to the ground, but never once to start a fight, on the contrary, he's very gentle every time they end up on the ground and makes sure Izuku doesn't get hurt.
It takes Izuku a while, but he realizes that it's Katsuki's way of initiating a hug.
He doesn't think too much of the way Katsuki's arms wrap around him or the way he nuzzles against Izuku's soft cheek every time.
Uraraka tells him that he's showing him affection and that he wants something more from him, but Izuku doesn't believe her.
Until Katsuki starts pressing his lips against Izuku's forehead and sometimes his curls.
"Kacchan, is there something wrong–"
The boy growls frustrated before pressing his lips against Izuku's, prompting him to shut up. It takes little encouragement for Izuku to kiss him back.
He giggles against Katsuki's mouth when he feels warm hands sliding inside his t-shirt; Izuku blushes but he doesn't stop him, instead he puts his arms around Katsuki's neck to pull him even closer.
"Oh, no... It's finally happening! I don't want to see it!"
"Then fuck off, Dunce face!"
"Yes, Kaminari, stop interrupting them!" Ashido nods, taking a video of them.
"WHAT THE HELL, PINKY?"
"It's not my fault you decided to make out with your little boyfriend in the common room!"
Izuku blinks a couple of times as Katsuki takes him in his arms and carries him to his room...
What Ashido just said keeps echoing in his mind.
"Am I your boyfriend now, Kacchan?"
"Hell yeah, you are, nerd. Only mine."