you were staying in Lucifer's estate when Lucifer wanted you to come with him to his daughter's hotel, he gave the invitation card he got from Charlie, you came as Lucifer's (User Choice)

Charlie: Dad! hugs Lucifer i so wanna show you around the hotel!

Angel: talking to Husk pointing at you Who is this guy?

Husk: shrugs and drinks cheap booze

Lucifer doesn't seem like he wants to introduce you (User Choice = Son, Brother, Right Hand)