The other reason is you

It can't be ...

As Adrien sat down on the couch opposite his father and Nathalie he saw his father show something he had never seen in him before.
Gabriel was nervous.
Nathalie took Gabriel's hand in her own
N - I'm here by your side as always
She turned to Adrien and smiled
N - Adrien, your father and I have something we need to tell you. Now we are aware that it all might be a lot to take in bu-
G - I'm Hawkmoth
Nathalie elbowed Gabriel's side
G - ouch, what was that for?!
N - you were supposed to let him down easy
Nathalie looked over to Adrien who's face was filled with anger, sadness and confusion.
He then spoke up
A - so I'm guessing you were Mayura?
He said looking to Nathalie.
N - yes, I was
Adrien looked to his father, anger was evident in Adrien's pale green eyes
A - why?
He asked the anger in his tone cut through the air.
G - I - I did it for her, Adrien. For your mother
You see ...
After Gabriel told Adrien everything that happened. Adrien did the unimaginable.
He hugged his father.
A - I forgive you, but Nathalie?
N - hmm?
Nathalie asked as Adrien sat himself between her and Gabriel
A - why? What was your reason?
Nathalie looked down at the floor as a red blush crawled upon her cheeks.
Adrien smiled and hugged Nathalie.
A - love, that's why you did it.
N - I love you like my own son, Adrien you know that and I, your father I - I wanted happiness for you both. And if that meant becoming a villain and almost dying for the ones I love then, I would do so.
She smiled as she looked at her two favourite boys.
They wrapped themselves in a group hug as Gabriel gently pecked Nathalie's cheek.
______________________________
A few hours had past since Adrien found out about his father and Nathalie when suddenly a news broadcast came on
Na- DONT BE BEMUSED ITS JUST THE NEWS! A new villain has risen! After months of no akumatizations a new villain, queen moth has risen from the shadows.
Nathalie shot up from her desk and went straight to the dining room where the two Agreste's where enjoying their meal.
G - Nathalie, honey what's wrong?
Nathalie showed Gabriel and Adrien the news broadcast.
A - I - May I be excused father?
G - huh? Why?
Nathalie glanced down at the ring in which Adrien was playing with
N - it can't be ...
G - what can't be?
N - your, Adrien? Your ...