Mari POV-
Adrien walked into class, later than me! He looked exhausted, and when he sat down he immediately set his head on his arms like he was going to fall asleep.
I shook his shoulder, Adrien groaned and looked up at me, saying,"Why do the lights have to be so briiiight..."
His pupils were practically slits they were so dialated. The smaller pupils made his eyes look greener then normal by a slight bit. His hair was also completely messed up. I gasped.
"A-Adrien, put your hands on your head like ch-cat ears."
Adrien sleepily put his hands on his head.
I stared. And stared. And ran out to the bathroom. I then put my handbag in my mouth,(sorry Tikki),and screamed "ADRIEN IS CHAT NOIR!!" into it. I received a thorough scolding from Tikki of course.
On patrol that day, I said to a very tired Chat Noir,"Hello Chat! Or should I say, Adrien? Hmmmm...?"
He was suddenly wide awake and saying," what? No. What?! No. No. No. no. No. No. No."
"Well Kitty, if you don't tell the truth, then I guess I can't tell you who I am." I smirked, knowing I had him.
"Ok fine. I'm Adrien. Who are you?"
"Put your hands on your head like this, Kitty!" I copied his position from that morning.
"M-Marinette?!?! Oh, Marinette! I love so much!!"
"You mean you love Ladybug so much, Kitty!"
"Well, yeah, but Marinette too! I like both parts of you!"
"And I you, my little kitten."
"Who you callin' little?!?! Wait, I'll let you call me that if you can truly be my lady. Will you be my girlfriend, Ladybug?"
"By the miraculous, YES!"
"Thank you, M'lady."
"Your welcome, little kitten."
They kissed.
*The next day...*
Third person POV-
When Marinette walked in on time the next day, you could say everyone was surprised.
When she walked up to Adrien without stuttering, you could call it shock.
When she said,"Hello little kitten." And  scratched his chin, you could say they thought the world was ending.
When Adrien purred and called her "princess", you could say they thought that they were all dreaming.
When Chloe walked in and Adrien and Marinette kissed, it would be an under exaggeration to say that their heads exploded, the apocalypse had come, they had all died, and every girl in the room(minus Chloe, duh) fangirled till their ears broke.

Hope you liked it, bye!