He already knew before the akuma attack that he shouldn't be treating her like that. He was a hypocrite if he was being honest with himself. She was being selfish when she visited him. It was selfish of Ladybug to use her powers to get close to him as Adrien.
But his initial intentions were just as selfish, if not more. He wasn't entirely sure why she started seeing him as Ladybug if she wanted to rectify the situation. Her intentions seemed pure; to make him feel better (even if it was just to rid her guilty conscience). Marinette hadn't initiated anything. It was him that asked for hugs. It was him that leaned in and kissed her. It was him that initiated sex. It was all him, and she followed like a love-sick puppy. She willingly gave him her virginity the second he asked for it.
Adrien sighed, hiding his face in his hands in embarrassment. He felt like a complete dick.
"Or would you ignore heartbroken Adrien and go fuck Luka instead?"
Ok yeah, he was a complete dick.
He needed to apologize to her, now.
He thought about talking to her as he walked into school the next day or even their Saturday meeting. But Alya and Nino would be there. He knew Alya picked up on his behavior immediately and was on to something, even if Marinette refused to say it. He was sure Alya would have his head if he dared walk up to Marinette after going back to being an asshole to her. Both the one on his shoulder and the other one between his legs.
He shivered at the thought.
Adrien tried his best to go throughout the day without causing any more trouble. Marinette seemed calmer than the previous day, but she would noticeably tense the second he walked into the room. Alya was staring daggers at him the whole day. If looks could kill, he'd be nothing but ashes at this point.
Nino gave him sympathetic looks but, out of love (or fear, maybe both), he stuck by his girlfriend as she was all but glued to Marinette's side.
His best option seemed to be visiting her himself as Chat Noir.
It took a lot of bribing with cheese to make the tiny god of destruction relent.
"Can't believe this kid is making me do this," Plagg grumbled as he finished his cheese.
Adrien chose to ignore him. He called out his transformation as soon as night fell.
He looked around before jumping out of his window and into a nearby rooftop. Chat Noir could feel the cold breeze hit his face as he ran. The winter months were approaching, so the nights became colder.
It didn't take him long to reach a familiar bakery. The lights were all off. The bakery had closed a few hours ago. The rest of the building was dark as well, so he assumed her parents had gone to sleep. The only exception to the darkness was her room. It was a soft light, probably a lamp, but enough to illuminate her pink walls.
He approached with caution. Chat Noir wasn't sure if she was expecting him. The last time he was there, it didn't end nicely. He landed on the balcony with a soft thud. Taking in a deep breath, he knocked on her balcony door.
A few moments later, the door opened. Marinette stared at him with wide eyes. She hadn't been expecting him.
"O-oh, you're here," she whispered.
"Is it a bad time?" he asked, worried he'd interrupted something.
Marinette couldn't help but feel her heart leap at the concern in his voice. He still cared about her. She shook her head, "N-no, come in."
She stepped aside, and he climbed in and down to the base of her room. It felt weird standing in front of her as Chat Noir. His mind was too clouded by anger and hurt the last time he stood in front of her like this.

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Mending A Broken Heart (+18)
FanfictionMiraculous Ladybug AU Adrien Agreste was head over heels for Marientte Dupain-Cheng. Marinette was head over heels for her partner, Chat Noir. Adrien's confession to Marinette was rejected. Heartbroken, he opens up to Ladybug. Through their conve...