Before we get started, I would like to point out that this story will be switching between point of views. You will know when if you pay attention! Credit goes to @roxannekeet Enjoy!!
Kagami's point of view
After a while of Adrien and I dating, I realized that it wasn't a good relationship. I only saw him as a friend and he seemed to be stuck on another. After about a month, I figured out the girl happened to be Ladybug, which just so happened to be Marinette but he didn't know. I found out with extreme observation. I know not to tell anyone, after all she is my only friend and I understand friends don't keep secrets, but she might hate me or worry about protecting herself more if she finds out I know.
Luka's point of view
I started to date Marinette shortly after Kagami and Adrien got together. We've been dating for a while and she seems to be happier than what she was before. Even though Marinette can hide her depression with ease, much like Adrien, doesn't mean it's not there. Also, it seems Marinette and I both like each other as friends and are making this whole dating thing awkward.
Marinette's point of view
"Luka?" I said, knocking on his bedroom door.
"Come on in Marinette!" He replies, a frown on his face.
"Is something wrong?" I ask, knowing he wants to be just friends. We seem really awkward together but when we forget everything and think of only being friends we have a lot of fun!
"I think you know. We should only be friends." He said.
"Oh thank god! Everything was so awkward!" I laughed, he joined in.
"So, did you finish the design?" Luka asked, a smirk on his face.
"Of course! It was my top priority!" I said, pulling up a picture on my phone.
"That's a sweet design Marinette! The band will love this!" Luka smiled.
"Thanks! Well I have to go because I told my parents I'd help them in the bakery after you and I talked! Talk to you later Luka!" I smiled and waved as I left his home.

362 words. I just wanted to get chapter one out quickly! I hope this story interests you!