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    Summary

    “Sorry,” Izuku gasps, finally able to draw a deep breath again. He fully expects Kacchan to leave, spooked by Izuku’s weird depravity. Not that Izuku ever meant to rattle him like this. He can’t help it; can’t help that he wants to intimately know every little part of him, like it was a part of himself.

    But just as Izuku catches his breath, Katsuki grabs his hair to forcefully pull his head back.

    “Guess it’s your birthday, so consider yourself lucky.”

    He remembers, Izuku thinks and his heart skips a painful beat.

    “You wanna taste it?" There’s something lurking in Katsuki’s tone. When Izuku nods with heated cheeks, Katsuki shoves his fingers into Izuku’s mouth. "Then here’s your fucking present.”

    Izuku gags at the rough intrusion and Katsuki laughs, all teeth.

    "Happy birthday, nerd. Now suck."

    -

    Written for Rei as part of the DKBK Birthday Exchange!
    Her prompt was: "Katsuki allowing Izuku to place his claim on him after teasing him during class hours".

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