Alastor

You and Alastor were a secret couple because let's say your father didn't like him at all. Until one day when your father went to visit Charlie's hotel, your sister and Alastor started arguing.

Lucifer: Charlie and Nadia are my daughters, you damn idiot! Your father said very upset.

Alastor: Well, Nadia prefers me as daddy~ and there's a reason I help Charlie with the hotel and not you. He said, getting dangerously close to Lucifer.

Alastor starts fighting with Lucifer, your father, for you