You are Five's fiancée so you were his plus one when he got invited to dinner on Christmas eve along with the rest of the family. After dinner, you decided to play some games for entertainment, that's how you got to playing truth or dare. It was Luther's turn and he decided to dare Five.

Luther: "I dare you to kiss the prettiest girl in the room."

He said with a smirk on his face. You smiled, expecting Five to go to you since you were his fiancée, but instead, he walked up to Lila and kissed her.