Okay so Angsty idea.
Luka gets called to be viperion again to fight an akuma. And sure enough they defeat the akuma but he screws up and lets slip her identity in front of her just as he was handing his miraculous back to her. (Not exactly being the best at lying) he tried to cover up that it was a slip up but Ladybug wasnt buying it.
He covered his mouth. But Marinette/Ladybug was not fooled.
"You knew." She mouthed, her voice barely audible.
Luka had seen Marinette upset, but this look in her eyes was something different.
He looked down.
"Yes. I knew" He confessed.
Ladybug was clutching her yo-yo. The grip looked liked it could crush the signature weapon of the heroine.
"When we fought wishmaker." She stated. She figured it out quickly.
"No one else..."
"You lied to me!" Ladybug shouted.
The musician tried to speak up but stopped as she continued.
"I trusted you to protect my identity and you lied about knowing." Ladybug spoke. "You lied right to my face!"
Luka felt his stomach crinkle every time she said that word.
"I chose you because I thought i could trust you, that if something did go wrong you would tell me! But you broke my trust!" Ladybug stated with her eyes welling up. This was such a betrayal to her. Luka didnt need to listen to her heart to understand that. He knew that he failed her.
"You dont know how much this secret meant... You dont know how dangerous it is..."
"Thats why I didnt mention it."
Ladybug looked at him.
"I could see how stressed you were! You are just a stressed teenager! I didnt want you freaking out over nothing. I said your secret was safe and it is! So is Chat noir's!" Luka answered back. "Yes I hated lying to you but it is what you needed."
Ladybug's earrings blinked and her transformation undone. Marinette's expression changed.... She was even madder.
"You dont know anything of what I need."
Luka matched her gaze.
"Maybe if you let me in earlier we could have..."
Marinette's eyes went wide.
"Are you serious right now?!"
Luka realized too late that now was not the time to talk about their failed relationship.
"I didnt..."
"No no, lets talk about THAT right now." Marinette anger was rising.
Her Kwami tried to intervene.
"Marinette... maybe this isn't the best topic to talk about."
"No, lets get this out of the way now. Lets air it all out." Marinette said as she shoved a macaroon into her kwami's hands for her to eat.
Luka was not prepared for the words to come.
"Our relationship was a mess."
"Yes because of..."
"Not because of the ladybug stuff."
Luka blinked at that. He was not expecting that.
"Oh sure me being Ladybug did cause me run out on our dates, hide that secret from you which resulted in your akumatization and our split. But even if it didnt, we wouldnt have stayed together that much longer."
"What makes you so sure?"
"Luka, I called you adrien on a phone call. I had forgotten about our movie date, Twice! I forgot you and Juleka shared a birthday until Alya changed plans from going to a movie with her to a party on the boat."
"Right because of..."
"I know Adrien's fifth names day."
Luka stopped.
"I could tell you Adrien's schedule for the next week down to the hour."
Marinette calmed down a bit.
"I know because I wanted to know as much as I could about him. I wanted to understand him better then anyone else. I never tried to do that for you. I dont think I ever could."
The words hung in the air for a moment. Luka was reeling from them before getting hit again.
"So me telling you may have delayed the inevitable, out of a sense of devotion, duty, loyalty maybe. But we both know who had my heart. Either you would have broken up with me because I wasnt willing to move on or I would have done it out of guilt. And if that did happen, I would have had solace knowing that you wouldnt have shared my identity out of anger."
The blue haired guitarist understood, the tone of her heart and her words were in complete harmony as she said that.
"But now I have no idea what to think of you!"
Luka felt that comment stab him in the back.
"Marinette..."
"You violated my trust. You destroyed any good memories I had of you! How can I know what you said was true? You claim to value the truth so much yet you lied to my face!"
Each word was another slash at his heart.
"I will find a new snake hero, someone I can trust. Good bye Luka." She turned away and started walking away.
Luka tried to reach out to her.
"Please Marinette... I am sorry."
Marinette stopped. She turned around, looking at him with an ice cold glare.
"If you ever cared about me, dont ever speak to me again and dont every get akumatized."
Luka watched as Marinette transformed and left him on the roof. Alone to process the exchange.
He knew he hated lying for a reason.
