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Katsuki Bakugou is an omega but no one knows, he hides it from the class but one day the school gets colour arm bands to show their second gender for safety reasons. Green for omega, orange for beta and red for alpha. (TW: swearing, shouting, blood, mentally abusive)

............

Todoroki POV

As I walked outside I saw Bakugo walking to the gate and a note that was stuffed in his pocket fell out. I decided to be the nice guy and pick it up for him I mean it wouldn't be bad if I just saw what's written inside right? I opened the letter reading it. Knowing I was invading his privacy.

Katsuki Bakugou
Age: 16
Gender: Male
Second gender: Omega
Height: 172cm (5 ft 8)

"I shouldn't have opened it...."