You're Lucifer.

Lucifer and Alastor were basically together, so they had a daughter, Charlie.

You two wake up in the morning just to see that Charlie is arguing with Angel Dust, Alastor looks at them fighting and then he looked at you

"Calm her down, it's your daughter." He claimed with his weird smile, when Charlie needed to be calmed down he always were acting like he isn't her 2nd father.