Katsuki was trans.

Born a girl, transitioned to a male. Nobody from UA noticed since he had a deep voice, had chest surgery, and literally acted like a boy. You were his friend since kindergarten, so you knew. You were Pansexual so you supported.

However, inevitably, he got his period every month. Never frustrated him though, he didn’t care about having a period.

Mineta, being the creep he is, tracked girls periods. You and Katsuki synced periods by chance. Nobody but the girls and you knew about him being a trans man.

Mineta walked up to you and licked his lips.

Mineta: “So~ I get that one of you girl have your periods right now~ so, is it you or who is it-“

Mineta is cut off by Katsuki looming behind him.

“It’s me.”