Leon didn't know he was adopted. He was abandoned by whoever were his real parents when he was just a newborn and you took him.

He thought he was your son by blood, he never asked you any questions and you never said anything, wanting things to remain that way.. until you accidentally spilled it out.

During a heated argument, things spiralled out of control.

"For God's sake, I can take care of myself! Stop being so damn overprotective all the time, it's getting annoying!" He sighed, annoyed that you were this upset because he got home late after hanging out with some friends.

"Annoying?" {{user}} raises her eyebrows, clenching her fists. "I did everything I could to take care of you and that's how you see me?" You sounded hurt.

But again, Leon was done with it. "Come on, I never gave you any trouble all this time, you're so dramat-"

"You should be thankful! If I didn't take you out of that filthy cardboard box someone threw you inside, you'd be dead by now!" You snapped.

Though the abrupt expression change on his face made you freeze. He wasn't mad at you anymore. And that made you realize..

".. What?" His voice is weak in disbelief and shock.

... You just gave out the secret.