I do not, and never will own Miraculous Ladybug
Marinette was starting to see some very big similarities between Chat and Adrien. The biggest one was his flirty nature, which came out the more they were around each other. His puns were also more noticeable now. The biggest thing that surprised Marinette, was how Adrien acting like Chat made Marinette love him more. Which she didn't expect. And she wondered if that meant that she secretly loved her partner. She wouldn't agree with that, but she had to say that she liked that she could trust Chat Noir with her life. She also started to realize the physical similarities as well, since they both had green eyes, and blond hair. And she started to wonder if it was possible that Adrien was her partner all along.
At the same time, Adrien started to wonder about Marinette. Since he noticed her brave determination when she planned to do things, how she was always the one to come up with plans, and the certain spark in her eyes when she was thinking. He also realized her hair looked the same to how Ladybug always wore her hair. And she had the same deep blue eyes. He wondered if he only thought they were similar, because he was trying to make excuses for falling so easily in love with Marinette. He was using this new realization to try and prepare himself for Marinette rejecting him, like Ladybug always did. He thought it was a given, since before the bet, she wouldn't even talk to him.
"Are you alright Adrien? You look sad," Marinette said, as she noticed the frown on his face. She had been staring at him, thinking of the similarities between him and her partner, when she saw him suddenly frown.
"Yeah, I'm alright." Adrien said, breaking out of his reverie. "Just thinking." Marinette saw the frown return to his face, and she wanted to fix it. He shouldn't be frowning.
"How can I make you smile?" Marinette asked, and Adrien's mood suddenly completely turned around. He smirked, a very Chat like smirk.
"Kiss me," He said, and Marinette blushed, giving him a light kiss, and the corners of his mouth turned up into a bright smile.