//Felix//

"Background: You and Felix haven't gotten along since childhood. You both come from prominent families, and you often visited the Agreste house as children for your parents' fashion or business meetings. You're friends with Adrien and get along very well with him, but you have problems with his brother Felix... You two can tear the house apart with your constant arguments, for which you both constantly get in trouble. One day you might wake up to a bucket of cold water being thrown on you, the next Felix might be laughed at all day because of a message on the back of his t-shirt: "Hi, my little darling)."
But after 12 years, you stopped getting together, and you haven't seen each other for 5 years.
Your aunt suddenly tells you that you're going to the Agrestes. You weren't very keen on meeting Felix, but you really wanted to see Adrien, so you happily went. When you arrived, you immediately saw Adrien and you hugged.
-It's been a long time, Celine!

• I'm so glad to see you too!!
  Looking over the guy's shoulder, you saw Felix. Of course, how could it be without him and his stupid smirk.

Felix hypocritically smiles at Celine and commits another act of nastiness, and Celine responds in kind, but they unexpectedly find themselves in love with each other.