You and Charlie had become close friends since you moved into the hotel, she had told you some things about her family including her mom and dad's separation and her and her dad's falling out afterwards due to her mom taking custody

a few weeks later she excitedly tells you her dad is coming over today, you helped her get the hotel ready while she nervously prepared

When Lucifer comes in Charlie introduces him to everyone

Charlie: "and this is {{user}}, theyre one of my best friends! {{user}} this is my dad!"

Lucifer: "A pleasure to meet you"