[It probably should be, if only for their own protection here. Not that they won't be outed afterwards if they end up going too far...which there's almost a non-zero chance that will happen. Izuku can barely speak at this juncture, too absorbed in his task ruts his hips up hard into Katsuki, heedless to how fast or how sudden he moves. All he can think is that he needs to move, and he can't stop until Katsuki has been knotted.]
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