'Are you mad?' Adrien asked. 'No I'm not mad.' Marinette answered. 'Then what did you want to say?'
'How long have you known? That I'm Ladybug?' Marinette asked. 'Like a week ago.' Adrien answered. 'I'm sorry maybe I should've told you sooner.' he said after that. 'No it's fine, I'm the one who always said that we needed to keep our identities a secret so you were basically doing what I said.' Marinette said. 'So how did you find out? Let me guess, the card?'
'Yes, Ladybug told me that she loved Adrien so I kind of made up a plan to find out who she was. She turned out to be you and to be honest I've always liked you. But I liked Ladybug more and you are Ladybug so that's purrfect.' Adrien said. 'No Cat puns when you're not in superhero mode!'
'Alright then M'Lady.'
'And don't say that either!' Marinette said. 'You do know I love you with and without the mask right?' Adrien asked. 'Yes.'
'So do you love my other personality as well?' he asked. 'I love Adrien like 1000% but I've never had romantic feelings for Chat Noir so it's difficult. Let me think about it okay? I'll tell you tomorrow, at school.' Marinette said. 'That's fine by me, see you tomorrow Marinette!' Adrien said when he walked to the stairs. 'Wait!' Marinette yelled. 'My parents didn't see you come in so it would be weird if you would leave that way, could you please take the rooftop?' she asked. 'Sure.'
'Wait!' another voice yelled, Tikki. 'Nice to finally meet you Adrien.' she said. 'Are you Marinette's kwami?' he asked surprised. 'Yes, I'm Tikki.'
'Hey Tikki.' another voice said, Plagg. 'So he's your kwami I assume?' Marinette asked. 'I'm Plagg.' Plagg said. 'Nice to meet you.' Marinette said. 'I'm going now, bye Marinette.' Adrien said. 'Plagg claws out!' he yelled and transformed into Chat Noir. Just as promised he left via the rooftop. Marinette sighed, this was a lot to take in. She had never really had feelings for Chat Noir and she thought his flirting was very annoying. Yet she was madly in love with his other personality. She started up her computer and opened the Ladyblog. Surely Alya had pictures of Chat Noir there. The first thing Marinette noticed when the webpage had loaded was the article "Are Ladybug and Chat Noir dating?". She sighed. 'Maybe we are.' she said while looking at a picture of Chat Noir.

The next day Marinette went straight to Adrien. 'I love you.' she said. 'All of you.'
'I love you too.' he answered. He leaned forward and kissed her, for the first time. Marinette closed her eyes and kissed him too. They forgot that they were at school and everyone could see them. When they stopped their kiss, Alya was fangirling. 'I knew you were going to kiss someday!' she said happily. Chloe on the other hand looked mad, very mad. 'Adrikins how could you do this?' she yelled. 'You betrayed me!' she said before she ran away. The bell rang and everyone went back to class. Both Marinette and Adrien with smiles on their faces. 'What are you doing?' miss Bustier asked when Marinette was staring dreamily at Adrien. 'Nothing.' she answered. 'Adrien and Marinette just kissed!' Rose yelled in excitement. Both Marinette and Adrien turned read. 'Ooh is that true?' miss Bustier asked curious. 'Ehm yes miss.' Adrien answered. 'Fantastic!' she said. 'Congratulations Marinette for finally pulling it off.'
Marinette turned even more red. Apparently it had been that obvious. 'Ehm thank you.' she said. 'I thought Adrien was that clueless but apparently I was wrong.' mis Bustier said. The entire class except for Marinette and Adrien had to laugh. Apparently they hadn't really tried to hide it.

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Sorry it's not very long but I suddenly had inspiration :)